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Sodium Amphibole Subgroup

A group of related mineral species

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Photos of Sodium Amphibole Subgroup (813)Recorded Ages and Analyses Discuss Sodium Amphibole Subgroup

Sodium Amphibole Subgroup Gallery Search Photos of Sodium Amphibole Subgroup

Edit Sodium Amphibole Subgroup Add Synonym Edit CIF structures Clear Cache

Arfvedsonite

Hurricane Mountain localities, North Conway, Conway, Carroll County, New Hampshire, USA

Glaucophane

Rio Oremo, Chiavolino, Pollone, Biella Province, Piedmont, Italy

Glaucophane, etc.

Ward Creek [1], Cazadero, Coast Range, Sonoma County, California, USA

Arfvedsonite

Hurricane Mountain localities, North Conway, Conway, Carroll County, New Hampshire, USA

Glaucophane

Rio Oremo, Chiavolino, Pollone, Biella Province, Piedmont, Italy

Glaucophane, etc.

Ward Creek [1], Cazadero, Coast Range, Sonoma County, California, USA

Arfvedsonite

Hurricane Mountain localities, North Conway, Conway, Carroll County, New Hampshire, USA

Glaucophane

Rio Oremo, Chiavolino, Pollone, Biella Province, Piedmont, Italy

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About Sodium Amphibole SubgroupHide

Formula:

A_0-1Na₂(C²⁺_2-4C³⁺_1-2Li_0-1)_Σ5(Si_8-mAl_mO₂₂)(OH,F,Cl)₂

The sodium amphibole subgroup is one of the subgroups belonging to the W(OH,F,Cl) amphibole group. It is defined with Na as the dominant element in the B position.
(The IMA-CNMNC definition is ^B(Na + Li)/ΣB ≥ 0.75, ^BNa/ΣB ≥ ^BLi/ΣB)

The sodium amphibole subgroup are further divided into root-name groups that are defined by the charge balance and dominant elements in the A and C positions in the generic formula above. The various positions in the formula can have the following content:

A position: n=0 or 1, when 1, it contains Na or K as the dominant elements.

C position : For all root name groups except the Nybøite and Leakeite groups, the content in the C position is C²⁺_3+nC³⁺_2-n, and with Si₈ in the T position.

The Nybøite group has n=1 and C²⁺_3+n C³⁺₂, balancing the formula with m=1 in the T position.

The leakeite group contains Li in the C position and it's C position is defined with C²⁺₂ C³⁺₂Li.

Mg, Fe²⁺, Al and Fe³⁺ are normally the dominant elements in the C²⁺ and C³⁺ positions for all root name groups.

(OH), F or Cl dominance define mineral species within a root name group.

Member of:

w(OH,F,Cl)-dominant Amphibole Group > Amphibole Supergroup

Name:

This amphibole subgroup was named "Alkali-amphiboles" in Leake's "Nomenclature of amphiboles"(1978) and renamed as "Sodic amphiboles" in the 1997 amphibole nomenclature. The group was again renamed in the 2012 amphibole nomenclature to "sodium amphibole subgroup".

This page provides mineralogical data about Sodium Amphibole Subgroup.

Unique IdentifiersHide

Mindat ID:

29366

Long-form identifier:

mindat:1:1:29366:0

IMA Classification of Sodium Amphibole SubgroupHide

IMA status notes:

IMA Approved Group Name

Chemistry of Sodium Amphibole SubgroupHide

Mindat Formula:

A_0-1Na₂(C²⁺_2-4C³⁺_1-2Li_0-1)_Σ5(Si_8-mAl_mO₂₂)(OH,F,Cl)₂

The sodium amphibole subgroup is one of the subgroups belonging to the W(OH,F,Cl) amphibole group. It is defined with Na as the dominant element in the B position.
(The IMA-CNMNC definition is ^B(Na + Li)/ΣB ≥ 0.75, ^BNa/ΣB ≥ ^BLi/ΣB)

The sodium amphibole subgroup are further divided into root-name groups that are defined by the charge balance and dominant elements in the A and C positions in the generic formula above. The various positions in the formula can have the following content:

A position: n=0 or 1, when 1, it contains Na or K as the dominant elements.

C position : For all root name groups except the Nybøite and Leakeite groups, the content in the C position is C²⁺_3+nC³⁺_2-n, and with Si₈ in the T position.

The Nybøite group has n=1 and C²⁺_3+n C³⁺₂, balancing the formula with m=1 in the T position.

The leakeite group contains Li in the C position and it's C position is defined with C²⁺₂ C³⁺₂Li.

Mg, Fe²⁺, Al and Fe³⁺ are normally the dominant elements in the C²⁺ and C³⁺ positions for all root name groups.

(OH), F or Cl dominance define mineral species within a root name group.

View all 52 analyses with additional filters.

Age distributionHide

Recorded ages:

Mesoproterozoic to Paleogene : 1456 Ma to 31.7 ± 0.7 Ma - based on 52 recorded ages.

Sample ages:

Sample ID	Recorded age	Geologic Time	Dating method
1	31.7 ± 0.7 Ma	Oligocene	K-Ar
2	41 Ma	Eocene	K-Ar
3	51 Ma	Eocene	K-Ar
4	80.1 ± 3.1 Ma	Late/Upper Cretaceous	K-Ar
5	212 Ma	Late/Upper Triassic	K-Ar
6	226 ± 1.1 Ma	Late/Upper Triassic	K-Ar
7	226 ± 1.1 Ma	Late/Upper Triassic	K-Ar
8	239.2 ± 0.4 Ma	Middle Triassic	SHRIMP zircon U-Pb dating of riebeckite granite
9	319 ± 8 Ma	Pennsylvanian	Ar-Ar
10	377 ± 7 Ma	Late/Upper Devonian	K-Ar
11	394 ± 15 Ma	Early/Lower Devonian	K-Ar
12	430 ± 12 Ma	Wenlock	K-Ar
13	551 Ma	Ediacaran	K-Ar
14	1456 to 1359 Ma	Mesoproterozoic	K-Ar

Sample references:

ID	Locality	Reference	Notes
1	Maoniuping carbonatite complex, Liangshan Yi, Sichuan, China	Pu, G. P. (2001). The evolution history of REE mineralization and major features of Himalayan REE deposit in Panzhihua-Xichang area, Sichuan. Study on Himalayan Endognic Mineralization, 104-116.
2	Warsak Intrusions, Mohmand District, Khyber Pakhtunkhwa Province, Pakistan	Kempe, D. R. C. (1973) The petrology of the Warsak alkaline granites, Pakistan, and their relationship to other alkaline rocks of the region. Geological Magazine, 110 (5) 385-404 doi:10.1017/s0016756800036189	Riebeckite from granite
3	Gigye-Gyeongju granite, Gyeongju City, North Gyeongsang Province, South Korea	Hwang, B. H., McWilliams, M., Son, M., & Yang, K. (2007). Tectonic implication of A-type granites across the Yangsan fault, Gigye and Gyeongju areas, southeast Korean Peninsula. International Geology Review, 49(12), 1094-1102.
4	Bardkish syenite, Urmia County, West Azerbaijan Province, Iran	Ghalamghash, J., N
5	Longwangzhuang pluton, Luanchuan County, Luoyang, Henan, China	Xinxiang, L. (1989). The geological characteristics of Longwangzhuuang A-type granite and its significance [J]. Acta Petrologica Sinica, 1, 67-77.
6	Sams Creek, Cobb Valley, Tasman Region, New Zealand	Tulloch, A. J. (1992). Petrology of the Sams Creek peralkaline granite dike, Takaka, New Zealand. New Zealand journal of geology and geophysics, 35(2), 193-200.
7	" "	Tulloch, A. J. (1992). Petrology of the Sams Creek peralkaline granite dike, Takaka, New Zealand. New Zealand journal of geology and geophysics, 35(2), 193-200.
8	Hongge V-Ti-Fe deposit, Yanbian County, Panzhihua, Sichuan, China	XIA, B., LIU, H., & ZHANG, Y. (2004). SHRIMP DATING OF AGPAITIC ALKALIC ROCKS IN PANXI RIFT ZONE AND ITS GEOLOGICAL IMPLICATIONS
9	Sams Creek, Cobb Valley, Tasman Region, New Zealand	Tulloch, A. J., & Dunlap, W. J. (2006). A Carboniferous 40Ar/39Ar amphibole emplacement age for the Au?bearing Sams Creek alkali?feldspar granite dike, west Nelson, New Zealand. New Zealand Journal of Geology and Geophysics, 49(2), 233-240.	mixture of arfvedsonite-riebeckite
10	Victoria River Granite Complex, Southern Grampians Shire, Victoria, Australia	Richards, J. R., & Singleton, O. P. (1981). Palaeozoic Victoria, Australia: igneous rocks, ages and their interpretation. Journal of the Geological Society of Australia, 28(3-4), 395-421.
11	Learnie Quarry, Black Isle, Highland, Scotland, UK	DEANS, T., GARSON, M. S., COATS, J. S. (1971) Fenite-type Soda Metasomatism in the Great Glen, Scotland. Nature Physical Science, 234. 145-147 doi:10.1038/physci234145a0	Undue reliance should not be placed on this because it derives from a single specimen, the. amphibole of which contained only 0.081% K.
12	Mount Bayliss, Prince Charles Mountains, Mac Robertson Land, East Antarctica, Antarctica	Sheraton, J. W., & England, R. N. (1980). Highly potassic mafic dykes from Antarctica. Journal of the Geological Society of Australia, 27(1-2), 129-135.
13	Gem Park Complex Prospect, Custer County, Colorado, USA	Orris, Greta J., Grauch, Richard I. (2002) Rare Earth Element Mines, Deposits, and Occurrences. Open-File Report 2002-189. US Geological Survey doi:10.3133/ofr02189
14	Norra Kärr, Gränna, Jönköping, Jönköping County, Sweden	Blaxland, Alan B (1977) Agpaitic magmatism at Norra Kärr? Rb-Sr isotopic evidence. Lithos, 10 (1) 1-8 doi:10.1016/0024-4937(77)90026-3

Chemical AnalysisHide

Oxide wt%:

Showing 12 of 37 analyses on this page.

	1	2	3	4	5	6	7	8	9	10	11	12
SiO₂	49.33 %	56.48 %	57.80 %	57.50 %	53.85 %	53.84 %	49.74 %	50.15 %	52.82 %	54.25 %	50.31 %	49.03 %
TiO₂	0.40 %	0.08 %	0.06 %		0.12 %	0.16 %	0.63 %	0.13 %	0.77 %	1.08 %	0.57 %	0.73 %
Al₂O₃	0.72 %	9.53 %	13.91 %	9.69 %	0.80 %	12.92 %	2.04 %		0.51 %	0.03 %	0.63 %	0.87 %
Fe₂O₃	1.55 %						0.0 %	2.94 %	8.50 %	8.07 %	12.00 %	14.51 %
FeO	30.95 %	16.04 %	0.89 %	10.77 %		5.03 %	33.36 %	7.47 %	13.82 %	6.69 %	22.14 %	13.70 %
MnO	2.15 %	0.05 %	0.05 %		0.10 %	0.02 %	1.36 %	0.09 %	3.26 %	0.32 %	0.77 %	5.46 %
MgO	0.74 %	7.90 %	17.32 %	10.86 %	9.49 %	14.21 %	0.99 %	12.07 %	4.8 %	13.99 %		0.61 %
CaO	1.01 %	0.70 %	0.60 %	1.37 %	1.40 %	2.33 %	0.80 %	3.03 %	0.09 %	1.16 %		0.05 %
Na₂O	7.07 %	7.02 %	5.89 %	6.73 %	6.39 %	9.26 %	6.56 %	8.4 %	7.65 %	6.33 %	8.82 %	8.95 %
K₂O	1.81 %	0.02 %	0.07 %		0.33 %	0.14 %	1.50 %	0.32 %	3.76 %	5.20 %	1.58 %	1.29 %
ZrO₂	0.20 %						0.0 %
Cl					0.01 %	0.01 %
F					0.18 %			2.58 %	1.21 %	2.20 %	2.31 %	2.85 %
Cr₂O₃		0.07 %						0.02 %
H₂O		2.12 %							1.38 %		(0.82) %
FeO₂					23.42 %
Li₂O									0.73 %		0.76 %	0.6 %
O=F									-0.51 %		-0.97 %	-1.20 %
NiO						0.11 %
ZnO								0.05 %	0.11 %	0.05 %	0.49 %	0.90 %
?O=F
Nb₂O₅
SnO₂
Fe₂O₃*
FeO*
SrO
PbO
Li₂O (by stoichiometry)
H₂O (by stoichiometry)
-O=F
Äl₂O₃								12.35 %
O								1.09 %
Ga₂O₃
V₂O₃
Total:	95.93 %	100.01 %	96.59 %	96.92 %	96.09 %	98.03 %	96.98 %	100.69 %	98.9 %	99.37 %	99.41 %	98.35 %

Empirical formulas:

Sample ID	Empirical Formula
13	(Na_0.62K_0.47) _1.09 (Na_1.93Ca_0.07) _2.00 (Fe²⁺_3.43Mg_0.04Fe³⁺0_.97Mn_0.12Ti_0.06Al_0.15Zr_0.01) _4.78(Si_7.92 Al_0.08) _8.00 O₂₂[ (OH) _1.97 F_0.03] _2.00
14	(Na_0,71K_0,301) _1,011 (Na_1,618Ca_0,382) ₂ (Fe2+_3,869Fe3+_0,664Ti_0,27Mn_0,115Al_0,072) _4,99 (Si_7,891Al_0,109) ₈O₂₂ ((OH) _1,458O_0,542) ₂
4	Na_0.01 (Na_1.80Ca_0.20)_Σ2.00 ( Mg_2.24Fe²⁺_0.92Fe³⁺_0.33Al_1.52)_Σ5.01(Al_0.06Si_7.94)_Σ8.00O₂₂OH₂
15	(Na0.569K0.369)0.938 (Na1.603Ca0.397)2(Mg3.025Feii1.273FeIII0.411Ti0.202Al0.036Mnii0.031Li0.029)5.007Si8.002O22 ((OH)1,168F0,655O0.168)2
6	(Na_0.72K_0.02)(Na_1.67Ca_0.33)(Mg_1.82Fe²⁺_0.18)(Mg_0.32Fe³⁺_0.24Ti_0.02Al_1.43)(Mg_0.8Fe²⁺_0.2) (Si_7.24Al_0.76)0₂₂(OH)₂
16	^A(Na_0.22K_0.0,05)_0.27 ^B( (Na_1.90Ca_0.10) _2.00 ^C( (Mg_3.16Fe²⁺_0.05Mn²⁺_0.12Fe³⁺_1.06Al_0.61) _5.00 ^T( (Si_7.96Al_0.04) _8.00O₂₂ ^W( (OH) _1.83 F_0.17) _2.00
17	(Na0.66K0.27)?0.93(Na1.83Ca0.17)?2.00(Mg0.06Fe2+3.15Mn0.31Zn0.01Fe3+1.38Ti0.06Al0.03)?5.00(Si7.35Al0.65)?8.00O22(OH1.58F0.42)?2.00
18	(Na_0.52K_0.48)(Na_1.90Li_0.07Ca_0.02)[(Fe²⁺_0.63Mn²⁺_0.56Mg_0.47Zn_0.23Ti_0.12)(Fe³⁺_1.93Al_0.06)Li_1.00][Si_7.98Al_0.02O₂₂]([OH]_0.90F_0.87O_0.23)
19	(Na_0.62K_0.38)(Na_1.89Ca_0.11)[(Mn²⁺_0.60Mg_0.50Zn_0.34Fe²⁺_0.32Ti_0.19Na_0.05)(Fe³⁺_1.96Al_0.04)Li_1.00][Si_7.92Al_0.08O₂₂](F_0.84[OH]_0.77O_0.39)
9	(K_0.73Na_0.27) _1.00 (Na_2.00Ca_0.01) _2.01 (Fe²⁺ _1.77 Mg_1.10Fe³⁺ _0.98Li_0.45Mn_0.42Ti_0.09Zn_0.01 Al_0.09) _4.91Si_8.09O₂₂[(OH) _1.41F_0.59] _2.00
20	(K_0.67Na_0.33) _1.00 (Na_1.74Ca_0.27) _2.01 (Fe²⁺ _2.26 Mg_1.79Fe³⁺ _0.55Mn_0.25Ti_0.09Zn_0.01 Al_0.05) _5.00(Si_7.94 Al_0.06) _8.00O₂₂[(OH) _1.23F_0.77] _2.00
21	(K_0.63 Na_0.15) _0.78 (Na_1.62Ca_0.36Mn_0.02) _2.00 (Mg_3.72 Fe²⁺ _0.31 Fe³⁺ _0.95Mn_0.00Ti_0.02Al_0.00) _5.00(Si_7.85Al_0.03 Fe³⁺ _0.11Cr_0.01) _8.00O₂₂[F_1.06(OH) _0.94]_2.00
10	K_0.98 (Na_1.81Ca_0.18) _1.99 (Mg_3.07 Fe²⁺ _0.83 Fe³⁺ _0.90Mn_0.04Ti_0.12Zn_0.01 Al_0.01) _4.98Si_8.00)O₂₂[F_1.03(OH) _0.73O _0.24] _2.00
22	(K_0.67Na_0.22) _0.89(Na_1.95Ca_0.05) _2.00 (Fe²⁺ _3.29Fe³⁺ _1.26Li_0.29Mn_0.19Ti_0.05Zn_0.02Mg_0.01) _5.11(Si_7.76Fe³⁺ _0.13Al_0.11) _8.00 O₂₂[(OH) _1.81F_0.18] _1.99
23	(Na_0.56K_0.44)(Na_1.90Li_0.06Ca_0.04)[(Mg_0.78Mn²⁺_0.45Fe²⁺_0.40Zn_0.26Ti_0.14)(Fe³⁺_1.90Al_0.07)Li_1.00][Si_7.98Al_0.02O₂₂](F_1.05[OH]_0.66O_0.29)
24	A(Na0.68K0.32)S=1.00 BNa2.00 C(Mg1.69Mn2+ 0.25Fe2+ 0.24Zn0.29Al0.23Fe3+ 1.50Ti0.02Li0.78)S=5.00 TSi8O22 W(F1.59(OH)0.41)S=2.00
11	(K0.32Na0.68)Na2(Li0.48Fe2.83Mn0.1Zn0.06Fe1.46Ti0.07)(Si7.88Al0.12)O22(F1.15OH0.85)
25	(K0.25Na0.75)Na2(Li0.48Fe2.84Mn0.11Zn0.05Fe1.45Ti0.07)(Si7.89Al0.11)O22(F1.35OH0.65)
26	^A(Na_0.526K_0.207)^B_0.733( (Na_1.514Ca_0.485Mn_0.072) ^C_2.00( (Mg_2.057Li_0.160Fe²⁺_0.631Mn²⁺_0.544Zn_0.015Fe³⁺_1.552Ti_0.042) _5.001 ^T( (Si_7.652Al_0.261) _7.913O^W₂₂( (F_1.143(OH) _0.857) _2.00
12	^A(Na_0.767K_0.261)^B_1.028( (Na_1.990Ca_0.010)^C_2.00( (Mg_0.144Li_0.383Fe²⁺_1.818Mn²⁺_0.734Fe³⁺_1.733Ti_0.087) _5.004 ^T( (Si_7.780Al_0.163) _7.943O^W₂₂( (F_1.448(OH) _0.552) _2.00
27	^A(Na_0.74K_0.24◻_0.02)^B_Σ1.00(Na_1.52Ca_0.24Mn²⁺_0.24)^C_Σ2.00(Mg_2.54Mn²⁺_1.45Mn³⁺_0.71Fe³⁺_0.26Ti_0.04)_Σ5.00T(Si_7.97Al_0.03)_Σ8.00O^W₂₂[(OH)_1.52O_0.48]_Σ2.00

Sample references:

ID	Type	Locality	Reference	Notes
1		Motzfeldt Centre, Igaliku Complex, Kujalleq, Greenland	Bradshaw, C. (1988). A petrographic structural and geochemical study of the alkaline igneous rocks of the Motzfeldt Centre South Greenland. Doctoral dissertation, Durham University.	Sample from an alkali-rich syenite.
2		Akeyazhi River valley, Ili Kazakh Autonomous Prefecture, Xinjiang, China	Jun Gao, Klemd, R., Lifei Zhang, Su Wang, and Xiong Xiao (1999): P–T path of high-pressure/low-temperature rocks and tectonic implications in the western Tianshan Mountains, NW China. Journal of Metamorphic Geology 17(6), 621-636.	Sample from blueschist
3	15632c	Case Parigi, Martiniana Po, Cuneo Province, Piedmont, Italy	Schertl, H. -P., Schreyer, W., Chopin, C. (1991) The pyrope-coesite rocks and their country rocks at Parigi, Dora Maira Massif, Western Alps: detailed petrography, mineral chemistry and PT-path. Contributions to Mineralogy and Petrology, 108 (1) 1-21 doi:10.1007/bf00307322	Analyzed sample is a minute inclusion in pyrope from a coesite, phengite, pyrope whiteschist. Mineral analyses were performed by means of the Cameca electron microprobe (CAMEBAX) , using a wavelength-dispersive technique with PAP correction acceleration voltage 15 kV, beam current 15 nA, measuring time 20 s).
4	52i	Kovalo eclogites, Kechros, Arriana, Rhodope, Eastern Macedonia and Thrace, Greece	Mposkos, E.; Baziotis, I.; Proyer, A. (2011) Pressure–temperature evolution of eclogites from the Kechros complex in the Eastern Rhodope (NE Greece). International Journal of Earth Sciences, 101 (4). 973-996 doi:10.1007/s00531-011-0699-2	EMPA analysis of an amphibole inclusion in garnet from an eclogite
5		Mud Tank Vermiculite Mine, Alcoota Station, Central Desert Region, Northern Territory, Australia	Currie, K. L., Knutson, J., Temby, P. A. (1992) The Mud Tank carbonatite complex, central Australia - an example of metasomatism at mid-crustal levels. Contributions to Mineralogy and Petrology, 109 (3) 326-339 doi:10.1007/bf00283322	Average of 6 analyses. Sample from an alkali-syenite.
6	Type Specimen	Nybø eclogite pod, Sørpollen, Vågsøy, Kinn, Vestland, Norway	Ungaretti, Luciano, Smith, David C., Rossi, Giuseppe (1981) Crystal-chemistry by X-ray structure refinement and electron microprobe analysis of a series of sodic-calcic to alkali-amphiboles from the Nybö eclogite pod, Norway. Bulletin de Minéralogie, 104 (4) 400-412 doi:10.3406/bulmi.1981.7486
7		Motzfeldt Centre, Igaliku Complex, Kujalleq, Greenland	Bradshaw, C. (1988). A petrographic structural and geochemical study of the alkaline igneous rocks of the Motzfeldt Centre South Greenland. Doctoral dissertation, Durham University.	Sample from an alkali-rich syenite
8		Jianchang, Donghai Co., Lianyungang, Jiangsu, China	Oberti, R., Boiocchi, M., Smith, D. C. (2003) Fluoronyböite from Jianchang (Su-Lu, China) and nyböite from Nybö (Nordfjord, Norway): a petrological and crystal-chemical comparison of these two high-pressure amphiboles. Mineralogical Magazine, 67 (4) 769-782 doi:10.1180/0026461036740133	Type specimen analysis.58
9		Palitra pegmatite, Karnasurt mine, Karnasurt Mountain, Lovozersky District, Murmansk Oblast, Russia	Pekov, I.V., Chukanov, N.V., Lebedeva, Yu. S., Pushcharovsky, D. Yu., Ferraris, G., Gula, A., Zadov, A.E., Novakova, A.A., Petersen, O.V. (2004) Potassicarfvedsonite, KNa₂ Fe²⁺₄Fe³⁺Si₈O₂₂(OH)₂, a K-dominant amphibole of the arfvedsonite series from agpaitic pegmatites – Mineral data, structure refinement and disorder in the A site. Neues Jahrbuch für Mineralogie - Monatshefte, 2004 (12) 555-574 doi:10.1127/0028-3649/2004/2004-0555	The chemical composition of potassicarfvedsonite was obtained (fluorine and cations except Li) by a Camebax SX50 electron microprobe. Li was determined by atom emission using a Carl Zeiss AAS30 spectrophotometer. The water content calculated The Fe2+/ Fe3+ ratio was calculated.
10	AS04-36	Monte Metocha, Xixano, Montepuez District, Cabo Delgado Province, Mozambique	Oberti, R., Boiocchi, M., Hawthorne, F. C., Robinson, P. (2010) Crystal structure and crystal chemistry of fluoro-potassic-magnesio-arfvedsonite from Monte Metocha, Xixano region, Mozambique, and discussion of the holotype from Quebec, Canada. Mineralogical Magazine, 74 (6) 951-960 doi:10.1180/minmag.2010.074.6.951	The sample was analyzed by electron microprobe using a Cameca SX-100 operating in wavelength-dispersive mode. The powder-diffraction pattern was recorded from a small fragment on a 114.6 mm Debye-Scherrer powder camera with a Gandolfi attachment and Ni-filtered Cu-Ka X-radiation The Fe2+-Fe3+ ratio and the H2O content were derived from the results of crystal-structure refinement. The oxo component (O2 at the O(3) site) was estimated based on the Ti content.
11	H1	Hurricane Mountain localities, North Conway, Conway, Carroll County, New Hampshire, USA