Okruschite (original) (raw)
A valid IMA mineral species
About OkruschiteHide
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Formula:
Ca2Mn2+5Be4(AsO4)6(OH)4 · 6H2O
Crystal System:
Monoclinic
Name:
Named after Professor Martin Okrusch (3 December 1934 in Guben - ), University of Wuerzburg, Würzburg, Germany.
The arsenate analogue of roscherite. Unique combination of elements.
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:46010:1
31edcd2f-85f3-41fd-a9bf-a1117eadc3d2
IMA Classification of OkruschiteHide
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Classification of OkruschiteHide
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8.DA.10
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
A : With small (and occasionally larger) cations
Mineral SymbolsHide
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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Okr | 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 OkruschiteHide
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Cleavage:
Distinct/Good
Distinct on (010).
Parting:
Parting on (100).
Density:
3.33(2) g/cm3 (Measured) 3.340 g/cm3 (Calculated)
Optical Data of OkruschiteHide
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RI values:
_n_α = 1.671(3) _n_β = 1.682(2) _n_γ = 1.687(3)
δ = 0.016
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Dispersion:
Dispersion Weak, r > v.
Optical Extinction:
X = b.
Chemistry of OkruschiteHide
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Mindat Formula:
Ca2Mn2+5Be4(AsO4)6(OH)4 · 6H2O
Crystallography of OkruschiteHide
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Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 16.33(4) Å, b = 12.03(3) Å, c = 6.93(1) Å
β = 94.84(5)°
Ratio:
a:b:c = 1.357 : 1 : 0.576
Morphology:
Blocky, thick-tabular crystals consisting of curved and differently oriented laths. Forms include {010} (major), {100}, {001}, and probably {110}.
X-Ray Powder DiffractionHide
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 9.68 Å | (39) |
| 4.95 Å | (34) |
| 4.17 Å | (34) |
| 3.25 Å | (100) |
| 3.11 Å | (32) |
| 2.841 Å | (27) |
| 2.711 Å | (26) |
| 1.726 Å | (26) |
Comments:
Fuchs Quarry, Bavaria, Germany. Data from the type description.
Geological EnvironmentHide
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Type Occurrence of OkruschiteHide
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General Appearance of Type Material:
Tabular aggregates up to 0.15 × 0.3 × 0.3 mm in size of curved and somewhat misaligned laths.
Place of Conservation of Type Material:
Type material is deposited in the collections of the Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia, registration number 4434/1
Geological Setting of Type Material:
In a hydrothermal vein cross-cutting rhyolite.
Associated Minerals at Type Locality:
Synonyms of OkruschiteHide
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Relationship of Okruschite to other SpeciesHide
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Other Members of this group:
| Atencioite | Ca2Fe2+3Mg2Be4(PO4)6(OH)4 · 6H2O | Tric. 1 : _P_1 |
|---|---|---|
| Footemineite | Ca2Mn2+Mn2+2Mn2+2Be4(PO4)6(OH)4 · 6H2O | Tric. 1 : _P_1 |
| Greifensteinite | Ca2Fe2+5Be4(PO4)6(OH)4 · 6H2O | Mon. 2/m : _B_2/b |
| Guimarãesite | Ca2Be4Zn5(PO4)6(OH)4 · 6H2O | Mon. 2/m : _B_2/b |
| Roscherite | Ca2Mn2+5Be4(PO4)6(OH)4 · 6H2O | Mon. 2/m : _B_2/m |
| Ruifrancoite | Ca2(◻,Mn)2(Fe3+,Mn,Mg)4Be4(PO4)6(OH)4(OH,H2O)2 · 4H2O | Mon. 2/m : _B_2/b |
| Zanazziite | Ca2Mg5Be4(PO4)6(OH)4 · 6H2O | Mon. 2/m : _B_2/b |
Common AssociatesHide
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Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
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| 8.DA.05 | Bearsite | Be2(AsO4)(OH) · 4H2O | Mon. |
|---|---|---|---|
| 8.DA.05 | Moraesite | Be2(PO4)(OH) · 4H2O | Mon. m : B b |
| 8.DA.10 | Roscherite | Ca2Mn2+5Be4(PO4)6(OH)4 · 6H2O | Mon. 2/m : _B_2/m |
| 8.DA.10 | Zanazziite | Ca2Mg5Be4(PO4)6(OH)4 · 6H2O | Mon. 2/m : _B_2/b |
| 8.DA.10 | Greifensteinite | Ca2Fe2+5Be4(PO4)6(OH)4 · 6H2O | Mon. 2/m : _B_2/b |
| 8.DA.10 | Atencioite | Ca2Fe2+3Mg2Be4(PO4)6(OH)4 · 6H2O | Tric. 1 : _P_1 |
| 8.DA.10 | Ruifrancoite | Ca2(◻,Mn)2(Fe3+,Mn,Mg)4Be4(PO4)6(OH)4(OH,H2O)2 · 4H2O | Mon. 2/m : _B_2/b |
| 8.DA.10 | Guimarãesite | Ca2Be4Zn5(PO4)6(OH)4 · 6H2O | Mon. 2/m : _B_2/b |
| 8.DA.10 | Footemineite | Ca2Mn2+Mn2+2Mn2+2Be4(PO4)6(OH)4 · 6H2O | Tric. 1 : _P_1 |
| 8.DA.15 | Uralolite | Ca2Be4(PO4)3(OH)3 · 5H2O | Mon. 2/m |
| 8.DA.20 | Weinebeneite | CaBe3(PO4)2(OH)2 · 4H2O | Mon. m : B b |
| 8.DA.25 | Tiptopite | K2(Na,Ca)2Li3Be6(PO4)6(OH)2 · H2O | Hex. 6 : _P_63 |
| 8.DA.40 | Spencerite | Zn4(PO4)2(OH)2 · 3H2O | Mon. 2/m : _P_2/b |
| 8.DA.45 | Glucine | CaBe4(PO4)2(OH)4 · 0.5H2O |
Other InformationHide
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IR Spectrum:
The IR spectrum is unique and considered a diagnostic tool.
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 OkruschiteHide
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References for OkruschiteHide
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Reference List:
Chukanov, Nikita V., Möhn, Gerhard, Pekov, Igor V., Belakovskiy, Dmitriy I., Bychkova, Yana V., Gurzhiy, Vladislav V., Lorenz, Joachim A. (2014) Okruschite, Ca2Mn2+5Be4(AsO4)6(OH)4·6H2O, a new roscherite-group mineral from Sailauf, Bavaria, Germany. European Journal of Mineralogy, 26 (4) 589-595 doi:10.1127/0935-1221/2014/0026-2387
Localities for OkruschiteHide
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This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the 
symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Locality ListHide
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- 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
| Germany (TL) | |
|---|---|
| Bavaria Lower Franconia Aschaffenburg District Sailauf Hartkoppe ⓘ Fuchs Quarry (TL) | Williams et al. (2013) +1 other reference |