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Proto-ferro-suenoite
A valid IMA mineral species
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About Proto-ferro-suenoite
Shigeho Sueno
Formula:
◻Mn2+2(Fe2+5)(Si8O22)(OH)2
Suenoite has Mn as the dominant in the B position. They are orthorhombic amphiboles in the magnesium-iron-manganese amphibole subgroup. The minerals in this root name group may have either Pnma or Pnmn (proto- prefixed name) space group symmetry. The suenoite is defined with A(Na+K+2Ca)<0.5 apfu and C(Al+Fe3++2Ti)<1 apfu.
Proto-ferro-suenoite is defined with Pnmn symmetry and and Fe2+ as the dominant element in the C position.
Proto-ferro-suenoite is defined with Pnmn symmetry and and Fe2+ as the dominant element in the C position.
Colour:
White to brownish-yellow.
Lustre:
Vitreous
Hardness:
5½ - 6
Crystal System:
Orthorhombic
Member of:
Name:
Originally named protomangano-ferro-anthophyllite. In a reorganization of the amphiboles, the use of mangano was abolished and a new root name was required. The International Mineralogical Association chose the new root name suenoite in honor of Shigeho Sueno (1937 – 11 March 2001, Tsukuba, Japan), Professor of Mineralogy at the University of Tsukuba and fellow of the Mineralogical Society of America.
Proto-ferro-suenoite is a very rare mineral known from only two localities (2016). It occurs as up to 15 mm acicular crystals in wheat-shaped aggregates together with rhodonite, pyroxmangite, spessartine and rhodochrosite at the type locality (Nippyo mine) and as small (sub-mm to mm) fibres as an alteration product of Mn-rich fayalite at the Suishoyama pegmatite.
Proto-ferro-suenoite can only be identified by a combination of EMPA, XRD and single crystal structure refinement, and the mineral should only be added to a new locality if properly identified.
Proto-ferro-suenoite can only be identified by a combination of EMPA, XRD and single crystal structure refinement, and the mineral should only be added to a new locality if properly identified.
Unique Identifiers
Mindat ID:
7256
Long-form identifier:
mindat:1:1:7256:0
IMA Classification of Proto-ferro-suenoite
Approved
IMA status notes:
Redefined by the IMA, Renamed by the IMA
IMA Formula:
◻Mn2+2Fe2+5Si8O22(OH)2
Approval year:
1986
First published:
1998
Approval history:
Redefined IMA 2012 s.p.
Type description reference:
SUENO, Shigeho, MATSUURA, Shigeru, BUNNO, Michiaki, KUROSAWA, Masanori (2002) Occurrence and crystal chemical features of protoferro-anthophyllite and protomangano-ferro-anthophyllite from Cheyenne Canyon and Cheyenne Mountain, U.S.A. and Hirukawa-mura, Suisho-yama, and Yokone-yama, Japan. Journal of Mineralogical and Petrological Sciences, 97 (4) 127-136 doi:10.2465/jmps.97.127
Classification of Proto-ferro-suenoite
9.DD.05
9 : SILICATES (Germanates)
D : Inosilicates
D : Inosilicates with 2-periodic double chains, Si4O11; Orthoamphiboles
9 : SILICATES (Germanates)
D : Inosilicates
D : Inosilicates with 2-periodic double chains, Si4O11; Orthoamphiboles
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Pfsue | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Proto-ferro-suenoite
Vitreous
Colour:
White to brownish-yellow.
Streak:
White to greyish-white
Hardness:
5½ - 6 on Mohs scale
Cleavage:
Perfect
(data(210)
(data(210)
Optical Data of Proto-ferro-suenoite
Type:
Biaxial (-)
RI values:
nα = 1.695 nβ = 1.714 nγ = 1.731
2V:
Measured: 76°
Max. Birefringence:
δ = 0.036
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Dispersion:
relatively strong
Pleochroism:
Weak
Comments:
pale yellow
Chemistry of Proto-ferro-suenoite
Mindat Formula:
◻Mn2+2(Fe2+5)(Si8O22)(OH)2
Suenoite has Mn as the dominant in the B position. They are orthorhombic amphiboles in the magnesium-iron-manganese amphibole subgroup. The minerals in this root name group may have either Pnma or Pnmn (proto- prefixed name) space group symmetry. The suenoite is defined with A(Na+K+2Ca)<0.5 apfu and C(Al+Fe3++2Ti)<1 apfu.
Proto-ferro-suenoite is defined with Pnmn symmetry and and Fe2+ as the dominant element in the C position.
Suenoite has Mn as the dominant in the B position. They are orthorhombic amphiboles in the magnesium-iron-manganese amphibole subgroup. The minerals in this root name group may have either Pnma or Pnmn (proto- prefixed name) space group symmetry. The suenoite is defined with A(Na+K+2Ca)<0.5 apfu and C(Al+Fe3++2Ti)<1 apfu.
Proto-ferro-suenoite is defined with Pnmn symmetry and and Fe2+ as the dominant element in the C position.
Element Weights:
Crystallography of Proto-ferro-suenoite
Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/m) - Dipyramidal
Cell Parameters:
a = 9.425(2) Å, b = 18.303(4) Å, c = 5.345(1) Å
Ratio:
a:b:c = 0.515 : 1 : 0.292
Unit Cell V:
922.04 ų (Calculated from Unit Cell)
Z:
2
Comment:
Space group: Pnmn
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 9.154 Å | (17) |
| 8.366 Å | (92) |
| 3.701 Å | (24) |
| 3.285 Å | (55) |
| 3.098 Å | (100) |
| 2.881 Å | (29) |
| 2.548 Å | (58) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 34 : Complex granite pegmatites |
Geological Setting:
Alteration product of Mn bearing fayalite.
Type Occurrence of Proto-ferro-suenoite
General Appearance of Type Material:
Light yellow-brown acicular crystals up to 15 mm in aggregates resembling wheat sheafs. It appears to be the dominant amphibole at the locality.
Place of Conservation of Type Material:
Institute of Science, Tsukuba, Japan (type).
National Science Museum, Tokyo, Japan (type).
National Science Museum, Tokyo, Japan (type).
Geological Setting of Type Material:
Metamorphic manganese deposit.
Associated Minerals at Type Locality:
Reference:
SUENO, Shigeho, MATSUURA, Shigeru, BUNNO, Michiaki, KUROSAWA, Masanori (2002) Occurrence and crystal chemical features of protoferro-anthophyllite and protomangano-ferro-anthophyllite from Cheyenne Canyon and Cheyenne Mountain, U.S.A. and Hirukawa-mura, Suisho-yama, and Yokone-yama, Japan. Journal of Mineralogical and Petrological Sciences, 97 (4) 127-136 doi:10.2465/jmps.97.127
Synonyms of Proto-ferro-suenoite
Other Language Names for Proto-ferro-suenoite
Dutch:Proto-ferro-suenoiet
German:Proto-Ferro-Suenoit
Japanese:プロトマンガノ鉄直閃石
Russian:Протоманганоферроантофиллит
Relationship of Proto-ferro-suenoite to other Species
Member of:
Other Members of Suenoite Root Name Group:
| Clino-ferro-suenoite | ◻Mn2+2(Fe2+5)(Si8O22)(OH)2 | Mon. 2/m : B2/m |
| Clino-suenoite | ◻Mn2+2(Mg5)(Si8O22)(OH)2 | Mon. 2/m : B2/m |
| Suenoite | ◻Mn2+2Mg5Si8O22(OH)2 | Orth. mmm(2/m2/m2/m) : Pnma |
Common Associates
Associations Based on Photo Data:
| 3 photos of Proto-ferro-suenoite associated with Magnetite | Fe2+Fe3+2O4 |
| 2 photos of Proto-ferro-suenoite associated with Spessartine | Mn2+3Al2(SiO4)3 |
| 2 photos of Proto-ferro-suenoite associated with Pyroxmangite | Mn2+SiO3 |
| 1 photo of Proto-ferro-suenoite associated with Fayalite | Fe2+2(SiO4) |
| 1 photo of Proto-ferro-suenoite associated with Grunerite | ◻Fe2+2Fe2+5(Si8O22)(OH)2 |
| 1 photo of Proto-ferro-suenoite associated with Quartz | SiO2 |
Related Minerals - Strunz-mindat Grouping
| 9.DD.05 | Suenoite | ◻Mn2+2Mg5Si8O22(OH)2 |
| 9.DD.05 | Proto-ferro-anthophyllite | ◻Fe2+2Fe2+5(Si8O22)(OH)2 |
| 9.DD.05 | Papikeite | NaMg2(Mg3Al2}(Al3Si5O22)(OH)2 |
| 9.DD.05 | Gedrite | ◻Mg2(Mg3Al2)(Al2Si6O22)(OH)2 |
| 9.DD.05 | Holmquistite | ◻Li2(Mg3Al2)(Si8O22)(OH)2 |
| 9.DD.05 | 'Sodic-anthophyllite' | {Na}{Mg2}{Mg5}(AlSi7O22)(OH)2 |
| 9.DD.05 | 'Sodic-ferro-anthophyllite' | NaFe2+2Fe2+5(AlSi7O22)(OH)2 |
| 9.DD.05 | Ferro-papikeite | NaFe2+2(Fe2+3Al2)(Si5Al3O22)(OH)2 |
| 9.DD.05 | Ferro-anthophyllite | ◻Fe2+2Fe2+5(Si8O22)(OH)2 |
| 9.DD.05 | Proto-anthophyllite | ◻Mg2Mg5(Si8O22)(OH)2 |
| 9.DD.05 | Ferro-gedrite | ◻Fe2+2(Fe2+3Al2)(Al2Si6O22)(OH)2 |
| 9.DD.05 | 'Ferri-holmquistite' | ◻{Li2}{Mg3Fe3+2}(Si8O22)(OH)2 |
| 9.DD.05 | Ferro-ferri-holmquistite | ◻Li2(Fe2+3Fe3+2)(Si8O22)(OH)2 |
| 9.DD.05 | Ferro-holmquistite | ◻Li2(Fe2+3Al2)(Si8O22)(OH)2 |
| 9.DD.05 | Anthophyllite | ◻Mg2Mg5(Si8O22)(OH)2 |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Proto-ferro-suenoite
mindat.org URL:
https://www.mindat.org/min-7256.html
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Please feel free to link to this page.
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References for Proto-ferro-suenoite
Reference List:
Sueno, Shigeho, Matsuura, Shigeru, Gibbs, G. V., Boisen Jr., M. B. (1998) A crystal chemical study of protoanthophyllite: orthoamphiboles with the protoamphibole structure. Physics and Chemistry of Minerals, 25 (5) 366-377 doi:10.1007/s002690050126
SUENO, Shigeho, MATSUURA, Shigeru, BUNNO, Michiaki, KUROSAWA, Masanori (2002) Occurrence and crystal chemical features of protoferro-anthophyllite and protomangano-ferro-anthophyllite from Cheyenne Canyon and Cheyenne Mountain, U.S.A. and Hirukawa-mura, Suisho-yama, and Yokone-yama, Japan. Journal of Mineralogical and Petrological Sciences, 97 (4) 127-136 doi:10.2465/jmps.97.127
Localities for Proto-ferro-suenoite
Showing 3 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Egypt | |
| El-Desoky et al. (2023) |
Japan | |
| Am.Min. 84: 196 +3 other references |
| AmMin 84:196 +3 other references |
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Nippyo mine, Awano, Kanuma City, Tochigi Prefecture, Japan