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Hydroxylwagnerite
A valid IMA mineral species
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About Hydroxylwagnerite
Formula:
Mg2(PO4)(OH)
Colour:
Creamy white
Lustre:
Vitreous
Hardness:
5
Specific Gravity:
3.074 (Calculated)
Crystal System:
Monoclinic
Member of:
Name:
Named for being the hydroxyl analogue of wagnerite.
Unique Identifiers
Mindat ID:
27459
Long-form identifier:
mindat:1:1:27459:5
IMA Classification of Hydroxylwagnerite
Classification of Hydroxylwagnerite
8.BB.15
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
B : With only medium-sized cations, (OH, etc.):RO4 about 1:1
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
B : With only medium-sized cations, (OH, etc.):RO4 about 1:1
41.6.2.2
41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
6 : A2(XO4)Zq
41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
6 : A2(XO4)Zq
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 |
|---|---|---|
| Hwag | 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 Hydroxylwagnerite
Vitreous
Transparency:
Transparent
Colour:
Creamy white
Streak:
White
Hardness:
5 on Mohs scale
Hardness Data:
Estimated
Comment:
By analogy with wagnerite.
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
Two poor, nearly perpendicular cleavages were observed in one section perpendicular to an optical axis.
Two poor, nearly perpendicular cleavages were observed in one section perpendicular to an optical axis.
Fracture:
Irregular/Uneven
Density:
3.074 g/cm3 (Calculated)
Comment:
Density could not be measured due to lack of material.
Optical Data of Hydroxylwagnerite
Type:
Biaxial (+)
RI values:
nα = 1.584(1) nβ = 1.586(1) nγ = 1.587(1)
2V:
Measured: 43° (2)
Max. Birefringence:
δ = 0.003
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:
Moderate (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.
Optical Extinction:
Y = b.
Pleochroism:
Not Visible
Chemistry of Hydroxylwagnerite
Mindat Formula:
Mg2(PO4)(OH)
Element Weights:
Elements listed:
Crystallography of Hydroxylwagnerite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/c
Cell Parameters:
a = 9.646(3) Å, b = 12.7314(16) Å, c = 11.980(4) Å
β = 108.38(4)°
β = 108.38(4)°
Ratio:
a:b:c = 0.758 : 1 : 0.941
Unit Cell V:
1,396.18 ų (Calculated from Unit Cell)
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
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Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Display Options
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Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
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2D | Stereo | Red-Blue | Red-Cyan
View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
Console Off | On | Grey | Yellow
Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0010961 | Hydroxylwagnerite | Raade G, Romming C (1986) The crystal structure of beta-Mg2PO4OH, a synthetic hydroxyl analogue of wagnerite Zeitschrift fur Kristallographie 177 15-26 |  | 1986 | synthetic | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.292 Å | (50) |
| 3.117 Å | (66) |
| 2.984 Å | (100) |
| 2.851 Å | (80) |
| 2.752 Å | (28) |
| 2.710 Å | (19) |
| 2.484 Å | (14) |
Comments:
From type description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 34 : Complex granite pegmatites | |
| Stage 5: Initiation of plate tectonics | <3.5-2.5 |
| 39 : High-? metamorphism (blueschist, eclogite, ultrahigh ? facies) |
Type Occurrence of Hydroxylwagnerite
General Appearance of Type Material:
Isolated anhedral crystals up to 400 µm.
Place of Conservation of Type Material:
Mineralogy Museum, School of Mines, Paris, France, 83104, 83015.
The Institute for Geology, Mineralogy and Geophysics, Ruhr-University Bochum, Germany.
The Institute for Geology, Mineralogy and Geophysics, Ruhr-University Bochum, Germany.
Geological Setting of Type Material:
In pyrope megablasts in samples from lenses of pyrope–kyanite–phengite–quartz-schist within metagranite in an ultrahigh-pressure metamorphic unit.
Associated Minerals at Type Locality:
Synonyms of Hydroxylwagnerite
Other Language Names for Hydroxylwagnerite
Dutch:Hydroxylwagneriet
German:Hydroxylwagnerit
Relationship of Hydroxylwagnerite to other Species
Member of:
Other Members of Wagnerite Group:
| Arsenowagnerite | Mg2(AsO4)F | Mon. 2/m : P21/c |
| Joosteite | Mn2+(Mn3+,Fe3+)(PO4)O | Mon. 2/m : B2/b |
| Sarkinite | Mn2+2(AsO4)(OH) | Mon. 2/m : P21/c |
| Stanĕkite | (Mn2+,Fe2+,Mg)Fe3+(PO4)O | Mon. 2/m : P21/c |
| Wagnerite | Mg2(PO4)F | Mon. 2/m : P21/c |
| 'Wagnerite-Arsenowagnerite Series' |
Common Associates
Associations Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 8.BB. | Moabite | NiFe3+(PO4)O |
| 8.BB. | Tilasite | CaMg(AsO4)F |
| 8.BB. | Paulgrothite | Cu9Fe3+O4(PO4)4Cl3 |
| 8.BB. | Karlditmarite | Cu9O4(PO4)2(SO4)2 |
| 8.BB. | Milkovoite | Cu4O(PO4)(AsO4) |
| 8.BB.X | Arsenowagnerite | Mg2(AsO4)F |
| 8.BB.05 | Tavorite | LiFe3+(PO4)(OH) |
| 8.BB.05 | Amblygonite | LiAl(PO4)F |
| 8.BB.05 | Montebrasite | LiAl(PO4)(OH) |
| 8.BB.10 | Zwieselite | Fe2+2(PO4)F |
| 8.BB.10 | Triplite | Mn2+2(PO4)F |
| 8.BB.15 | 'Unnamed (Sb-analogue of Auriacusite)' | Fe3+Cu2+[(Sb,As)O4]O |
| 8.BB.15 | Joosteite | Mn2+(Mn3+,Fe3+)(PO4)O |
| 8.BB.15 | Wagnerite | Mg2(PO4)F |
| 8.BB.15 | Stanĕkite | (Mn2+,Fe2+,Mg)Fe3+(PO4)O |
| 8.BB.15 | Triploidite | Mn2+2(PO4)(OH) |
| 8.BB.15 | Sarkinite | Mn2+2(AsO4)(OH) |
| 8.BB.15 | Wolfeite | Fe2+2(PO4)(OH) |
| 8.BB.20 | Holtedahlite | Mg2(PO4)(OH) |
| 8.BB.20 | Satterlyite | (Fe2+,Mg,Fe)12(PO4)5(PO3OH)(OH,O)6 |
| 8.BB.25 | Althausite | Mg4(PO4)2(OH,O)(F,◻) |
| 8.BB.30 | Zincolivenite | CuZn(AsO4)(OH) |
| 8.BB.30 | Adamite | Zn2(AsO4)(OH) |
| 8.BB.30 | Libethenite | Cu2(PO4)(OH) |
| 8.BB.30 | Zincolibethenite | CuZn(PO4)(OH) |
| 8.BB.30 | Eveite | Mn2+2(AsO4)(OH) |
| 8.BB.30 | Olivenite | Cu2(AsO4)(OH) |
| 8.BB.30 | Auriacusite | Fe3+Cu2+(AsO4)O |
| 8.BB.35 | Paradamite | Zn2(AsO4)(OH) |
| 8.BB.35 | Tarbuttite | Zn2(PO4)(OH) |
| 8.BB.40 | Barbosalite | Fe2+Fe3+2(PO4)2(OH)2 |
| 8.BB.40 | Scorzalite | Fe2+Al2(PO4)2(OH)2 |
| 8.BB.40 | Lazulite | MgAl2(PO4)2(OH)2 |
| 8.BB.40 | Meizhouite | Fe2+V3+2(PO4)2(OH)2 |
| 8.BB.40 | Hentschelite | CuFe3+2(PO4)2(OH)2 |
| 8.BB.40 | Wilhelmkleinite | ZnFe3+2(AsO4)2(OH)2 |
| 8.BB.45 | Dokuchaevite | Cu8O2(VO4)3Cl3 |
| 8.BB.45 | Trolleite | Al4(PO4)3(OH)3 |
| 8.BB.45 | Yaroshevskite | Cu9O2(VO4)4Cl2 |
| 8.BB.50 | Namibite | Cu(BiO)2(VO4)(OH) |
| 8.BB.50 | Aleutite | [Cu5O2](AsO4)(VO4) · (Cu,K,Pb,Rb,Cs,)Cl |
| 8.BB.52a | Ericlaxmanite | Cu4O(AsO4)2 |
| 8.BB.52b | Kozyrevskite | Cu4O(AsO4)2 |
| 8.BB.55 | Phosphoellenbergerite | (Mg,◻)2Mg12(PO4,PO3OH)6(PO3OH,CO3)2(OH)6 |
| 8.BB.55 | Popovite | Cu5O2(AsO4)2 |
| 8.BB.60 | Urusovite | CuAl(AsO4)O |
| 8.BB.65 | Theoparacelsite | Cu3(As2O7)(OH)2 |
| 8.BB.70 | Turanite | Cu5(VO4)2(OH)4 |
| 8.BB.75 | Stoiberite | Cu5(VO4)2O2 |
| 8.BB.80 | Fingerite | Cu11(VO4)6O2 |
| 8.BB.85 | Averievite | Cu6(VO4)2O2Cl2 |
| 8.BB.90 | Richellite | CaFe3+2(PO4)2(OH,F)2 |
| 8.BB.90 | Lipscombite | Fe2+Fe3+2(PO4)2(OH)2 |
| 8.BB.90 | Zinclipscombite | ZnFe3+2(PO4)2(OH)2 |
Fluorescence of Hydroxylwagnerite
Not fluorescent.
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 Hydroxylwagnerite
mindat.org URL:
https://www.mindat.org/min-27459.html
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Please feel free to link to this page.
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References for Hydroxylwagnerite
Reference List:
Raade, Gunnar; Rømming, Christian (1986) The crystal structure of β-Mg2PO4OH, a synthetic hydroxyl analogue of wagnerite. Zeitschrift für Kristallographie, 177 (1-2). p.15-26. doi:10.1524/zkri.1986.177.1-2.15
Chopin, Christian, Armbruster, Thomas, Grew, Edward S., Baronnet, Alain, Leyx, Catherine, Medenbach, Olaf (2014) The triplite–triploidite supergroup: structural modulation in wagnerite, discreditation of magniotriplite, and the new mineral hydroxylwagnerite. European Journal of Mineralogy, 26 (4) 553-565 doi:10.1127/0935-1221/2014/0026-2386
Localities for Hydroxylwagnerite
Showing 2 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.
Austria | |
| Bojar (2019) |
Italy (TL) | |
| Chopin et al. (2014) |
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Dora-Maira coesite-bearing unit, Cuneo Province, Piedmont, Italy