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Okruschite

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Formula:
Ca2Mn2+5Be4(AsO4)6(OH)4·6H2O
Colour:
White
Lustre:
Vitreous
Specific Gravity:
3.33
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.


Hide all sections | Show all sections

Classification of OkruschiteHide

Approved
Approval Year:
2013

Physical Properties of OkruschiteHide

Vitreous
Transparency:
Transparent
Colour:
White
Comment:
Semitransparent
Density:
3.33(2) g/cm3 (Measured)    

Optical Data of OkruschiteHide

Type:
Biaxial (-)
RI values:
nα = 1.671(3) nβ = 1.682(2) nγ = 1.687(3)
2V:
Measured: 65° (5)
Max Birefringence:
δ = 0.016
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High

Chemical Properties of OkruschiteHide

Formula:
Ca2Mn2+5Be4(AsO4)6(OH)4·6H2O
IMA Formula:
Ca2Mn2+5Be4(AsO4)6(OH)4 · 6H2O

Crystallography of OkruschiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
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
Unit Cell V:
1357 ų
Z:
2
Morphology:
Tabular aggregates

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
9.68(39)
4.95(34)
4.17(34)
3.25(100)
3.11(32)
2.841(27)
2.711(26)
1.726(26)
Comments:
From Type Description.

Type Occurrence of OkruschiteHide

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

Other Language Names for OkruschiteHide

Relationship of Okruschite to other SpeciesHide

Other Members of this group:
AtencioiteCa2Fe2+3Mg2Be4(PO4)6(OH)4 · 6H2O
FootemineiteCa2Mn2+Mn2+2Mn2+2Be4(PO4)6(OH)4 · 6H2OTric. 1 : P1
GreifensteiniteCa2Fe2+5Be4(PO4)6(OH)4 · 6H2OMon.
GuimarãesiteCa2Be4Zn5(PO4)6(OH)4 · 6H2OMon. 2/m : B2/b
RoscheriteCa2Mn2+5Be4(PO4)6(OH)4 · 6H2OMon. 2/m : B2/m
RuifrancoiteCa2(◻,Mn)2(Fe3+,Mn,Mg)4Be4(PO4)6(OH)4(OH,H2O)2 · 4H2OMon. 2/m : B2/b
ZanazziiteCa2Mg5Be4(PO4)6(OH)4 · 6H2OMon. 2/m : B2/b

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for OkruschiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Chukanov, N.V., Möhn, G., Pekov, I.V., Belakovskiy, D.I., Bychkova, Y.V., Lorenz, J.A. and Gurzhiy, V.V. (2013) Okruschite, IMA 2013-097. CNMNC Newsletter No. 18, December 2013, page 3257; Mineralogical Magazine: 77: 3249-3258.
Chukanov, N.V., Möhn, G., Pekov, I.V., Belakovskiy, D.I., Bychkova, Y.V., Gurzhiy, V.V., Lorenz, J.A. (2014): Okruschite, Ca2Mn2+5Be4(AsO4)6(OH)4∙6H2O, a new roscherite-group mineral from Sailauf, Bavaria, Germany. European Journal of Mineralogy: 26: 589-595.

Internet Links for OkruschiteHide

Localities for OkruschiteHide

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

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Germany (TL)
 
  • Bavaria
    • Franconia
      • Spessart
        • Hösbach
          • Sailauf
            • Hartkoppe
Chukanov, N.V., Möhn, G., Pekov, I.V., Belakovskiy, D.I., Bychkova, Y.V., Lorenz, J.A. and Gurzhiy, V.V. (2013) Okruschite, IMA 2013-097. CNMNC Newsletter No. 18, December 2013, page 3257; Mineralogical Magazine, 77, 3249-3258; Chukanov, N.V., Möhn, G., Pekov, I.V., Belakovskiy, D.I., Bychkova, Y.V., Gurzhiy, V.V., Lorenz, J.A. (2014): Okruschite, Ca2Mn2+5Be4(AsO4)6(OH)4∙6H2O, a new roscherite-group mineral from Sailauf, Bavaria, Germany. European Journal of Mineralogy, 26, 589-595
Mineral and/or Locality  
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