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Grischunite

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About GrischuniteHide

Formula:
NaCa2Mn2+5Fe3+(AsO4)6 · 2H2O
Colour:
Dark red-brown.
Lustre:
Vitreous
Hardness:
5
Crystal System:
Orthorhombic
Member of:
Name:
For the Grischun (Grisons; Graubünden) region in which the type locality is situated.

Classification of GrischuniteHide

Approved
Approval Year:
1981
8.CF.05

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
F : With large and medium-sized cations, RO4:H2O > 1:1
40.2.11.1

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
2 : AB2(XO4)2·xH2O
20.8.22

20 : Arsenates (also arsenates with phosphate, but without other anions)
8 : Arsenates of Mn

Physical Properties of GrischuniteHide

Vitreous
Colour:
Dark red-brown.
Hardness:

Optical Data of GrischuniteHide

Type:
Biaxial (+)
RI values:
nα = 1.784 nβ = 1.785 nγ = 1.790
2V:
Measured: 40° to 50°, Calculated: 50°
Max Birefringence:
δ = 0.006
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
extreme

Chemical Properties of GrischuniteHide

Formula:
NaCa2Mn2+5Fe3+(AsO4)6 · 2H2O

Crystallography of GrischuniteHide

Crystal System:
Orthorhombic
Cell Parameters:
a = 12.855 Å, b = 13.487 Å, c = 12.047 Å
Ratio:
a:b:c = 0.953 : 1 : 0.893
Unit Cell V:
2,088.65 ų (Calculated from Unit Cell)
Z:
4

Type Occurrence of GrischuniteHide

Synonyms of GrischuniteHide

Other Language Names for GrischuniteHide

Relationship of Grischunite to other SpeciesHide

Member of:
Other Members of this group:
BederiteCa2(Mn2+)4(Fe3+)2(PO4)6 · 2H2OOrth.
Maneckiite(Na◻)Ca2Fe2+2(Fe3+Mg)Mn2(PO4)6 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
Tassieite(Na,◻)Ca2(Mg,Fe2+,Fe3+)2(Fe2+,Mg)2(Fe3+,Mg)2(PO4)6 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
WicksiteNaCa2(Fe2+,Mn2+)4MgFe3+(PO4)6 · 2H2OOrth. mmm (2/m 2/m 2/m)

Related Minerals - Nickel-Strunz GroupingHide

8.CF.05WicksiteNaCa2(Fe2+,Mn2+)4MgFe3+(PO4)6 · 2H2OOrth. mmm (2/m 2/m 2/m)
8.CF.05BederiteCa2(Mn2+)4(Fe3+)2(PO4)6 · 2H2OOrth.
8.CF.05Tassieite(Na,◻)Ca2(Mg,Fe2+,Fe3+)2(Fe2+,Mg)2(Fe3+,Mg)2(PO4)6 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.CF.10HaigerachiteKFe3+3(HPO4)2(H2PO4)6 · 4H2OMon. 2/m : B2/b

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

20.8.1SarkiniteMn2+2(AsO4)(OH)Mon. 2/m : P2/m
20.8.2EveiteMn2+2(AsO4)(OH)Orth. mmm (2/m 2/m 2/m) : Pnnm
20.8.3ArsenoclasiteMn2+5(AsO4)2(OH)4Orth.
20.8.4FlinkiteMn2+2Mn3+(AsO4)(OH)4Orth.
20.8.5JarosewichiteMn2+3Mn3+(AsO4)(OH)6Orth. 2 2 2
20.8.6AllactiteMn2+7(AsO4)2(OH)8Mon. 2/m : P21/b
20.8.7KrautiteMn(HAsO4) · H2OMon. 2 : P21
20.8.8SynadelphiteMn2+9(As5+O4)2(As3+O3)(OH)9 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pnma
20.8.9SterlinghilliteMn3(AsO4)2 · 4H2OTric. 1 : P1
20.8.10GeigeriteMn2+5(AsO4)2(HAsO4)2 · 10H2OTric.
20.8.11Akrochordite(Mn2+,Mg)5(AsO4)2(OH)4 · 4H2OMon. 2/m : P21/b
20.8.12Manganohörnesite(Mn,Mg)3(AsO4)2 · 8H2OMon. 2/m : P2/m
20.8.13FluckiteCaMn2+(HAsO4)2 · 2H2OTric. 1 : P1
20.8.14BrandtiteCa2(Mn2+,Mg)(AsO4)2 · 2H2OMon. 2/m : P21/b
20.8.15ParabrandtiteCa2Mn2+(AsO4)2 · 2H2OTric.
20.8.16WallkilldelliteCa2Mn2+3(AsO4)2(OH)4 · 9H2OHex.
20.8.17Berzeliite(NaCa2)Mg2(AsO4)3Iso. m3m (4/m 3 2/m) : Ia3d
20.8.18ManganberzeliiteNaCa2Mn2+2(AsO4)3Iso. m3m (4/m 3 2/m) : Ia3d
20.8.19Magnesiochlorophoenicite(Mg,Mn)3Zn2(AsO4)(OH,O)6Mon. 2/m : B2/m
20.8.20VillyaelleniteMnMn2Ca2(AsO4)2(HAsO4)2 · 4H2OMon. 2/m : B2/b
20.8.21Hematolite(Mn,Mg,Al,Fe3+)15(As5+O4)2(As3+O3)(OH)23Trig. 3 : R3

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 GrischuniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Graeser, S., Schwander, H., Suhner, B. (1984): Grischunit (CaMn2[AsO4]2), eine neue Mineralart aus den Schweizer Alpen. Schweizerische Mineralogische und Petrographische Mitteilungen 64, 1-10.
American Mineralogist: 71: 227-228.
Bianchi, R., Pilati, T., Mannucci, G. (1987): Crystal structure of grischunite. American Mineralogist 72, 1225-1229.

Internet Links for GrischuniteHide

Localities for GrischuniteHide

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.
Switzerland (TL)
 
  • Grischun (Grisons; Graubünden)
    • Albula Valley
      • Oberhalbstein (Surses; Sursass)
        • Tinizong (Tinzen)
[Schweiz.Min.Petr.Mitt.(1984) 64,; Nickel & Nichols, 1991, 80 - "Mineral Reference Manual"]
Mineral and/or Locality  
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