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Grischunite

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Big Photo

Falotta, Tinizong (Tinzen), Oberhalbstein (Surses; Sursass), Albula Valley, Grischun (Grisons; Graubünden), Switzerland
© Stephan Wolfsried

Show Grischunite Photos (6)



Formula:
NaCa
 
2
Mn
2+
5
Fe
3+
 
(AsO
 
4
)
 
6
 · 2H
 
2
O
System:OrthorhombicColour:Dark red-brown.
Lustre:VitreousHardness:5
Name:
For the Grischun (Grisons; Graubünden) region in which the type locality is situated.


Wicksite Group.

Classification of Grischunite

IMA status:Approved 1981
Strunz 8th edition ID:7/C.18-20
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:40.2.11.1

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
2 : AB2(XO4)2·xH2O
Hey's CIM Ref.:20.8.22

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

Type Locality:Falotta, Tinizong (Tinzen), Oberhalbstein (Surses; Sursass), Albula Valley, Grischun (Grisons; Graubünden), Switzerland
Year of Discovery:1984

Physical Properties of Grischunite

Lustre:Vitreous
Colour:Dark red-brown.
Hardness (Mohs):5

Crystallography of Grischunite

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

Optical Data of Grischunite

Type:Biaxial (+)
RI values: nα = 1.784 nβ = 1.785 nγ = 1.790
2V:Measured: 40° to 50°, Calculated: 50°
Maximum Birefringence:δ = 0.006

Chart 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 Grischunite

Formula:
NaCa
 
2
Mn
2+
5
Fe
3+
 
(AsO
 
4
)
 
6
 · 2H
 
2
O
Essential elements:As, Ca, Fe, H, Mn, Na, O
All elements listed in formula:As, Ca, Fe, H, Mn, Na, O

Relationship of Grischunite to other Species

Structurally related to group(s):
Wicksite Group
Related Minerals - Nickel-Strunz Grouping):

- +
8.CF.05Wicksite
NaCa
 
2
(Fe
2+
 
,Mn
2+
 
)
 
4
MgFe
3+
 
(PO
 
4
)
 
6
 · 2H
 
2
O
8.CF.05Bederite
NaCa
 
2
(Mn
2+
 
,Mg,Fe
2+
 
)
 
2
Mn
2+
2
(Fe
3+
 
,Mg
2+
 
,Al)
 
2
(PO
 
4
)
 
6
 · 2H
 
2
O
8.CF.05Tassieite
(Na,◻)Ca
 
2
(Mg,Fe
2+
 
,Fe
3+
 
)
 
2
(Fe
2+
 
,Mg)
 
2
(Fe
3+
 
,Mg)
 
2
(PO
 
4
)
 
6
 · 2H
 
2
O
8.CF.10Haigerachite
KFe
3+
3
(HPO
 
4
)
 
2
(H
 
2
PO
 
4
)
 
6
 · 4H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
20.8.1Sarkinite
Mn
2+
2
(AsO
 
4
)(OH)
20.8.2Eveite
Mn
2+
2
(AsO
 
4
)(OH)
20.8.3Arsenoclasite
Mn
2+
5
(AsO
 
4
)
 
2
(OH)
 
4
20.8.4Flinkite
Mn
2+
2
Mn
3+
 
(AsO
 
4
)(OH)
 
4
20.8.5Jarosewichite
Mn
2+
3
Mn
3+
 
(AsO
 
4
)(OH)
 
6
20.8.6Allactite
Mn
2+
7
(AsO
 
4
)
 
2
(OH)
 
8
20.8.7Krautite
Mn(HAsO
 
4
) · H
 
2
O
20.8.8Synadelphite
Mn
2+
9
(As
5+
 
O
 
4
)
 
2
(As
3+
 
O
 
3
)(OH)
 
9
 · 2H
 
2
O
20.8.9Sterlinghillite
Mn
 
3
(AsO
 
4
)
 
2
 · 4H
 
2
O
20.8.10Geigerite
Mn
2+
5
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 10H
 
2
O
20.8.11Akrochordite
(Mn
2+
 
,Mg)
 
5
(AsO
 
4
)
 
2
(OH)
 
4
 · 4H
 
2
O
20.8.12Manganohörnesite
(Mn,Mg)
 
3
(AsO
 
4
)
 
2
 · 8H
 
2
O
20.8.13Fluckite
CaMn
2+
 
(HAsO
 
4
)
 
2
 · 2H
 
2
O
20.8.14Brandtite
Ca
 
2
(Mn
2+
 
,Mg)(AsO
 
4
)
 
2
 · 2H
 
2
O
20.8.15Parabrandtite
Ca
 
2
Mn
2+
 
(AsO
 
4
)
 
2
 · 2H
 
2
O
20.8.16Wallkilldellite-(Mn)
Ca
 
2
Mn
2+
3
(AsO
 
4
)
 
2
(OH)
 
4
 · 9H
 
2
O
20.8.17Berzeliite
NaCa
 
2
(Mg,Mn
2+
 
)
 
2
(AsO
 
4
)
 
3
20.8.18Manganberzeliite
(Ca,Na)
 
3
(Mn
2+
 
,Mg)
 
2
(AsO
 
4
)
 
3
20.8.19Magnesiochlorophoenicite
(Mg,Mn)
 
3
Zn
 
2
(AsO
 
4
)(OH,O)
 
6
20.8.20Villyaellenite
MnMn
 
2
Ca
 
2
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 4H
 
2
O
20.8.21Hematolite
(Mn,Mg,Al)
 
15
(As
5+
 
O
 
4
)
 
2
(As
3+
 
O
 
3
)(OH)
 
23

Other Names for Grischunite

Synonyms:
IMA1981-028
Other Languages:
German:Grischunit
Russian:Гришунит
Spanish:Grischunita

Other Information

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

References for Grischunite

Reference List:

- +
American Mineralogist: 71: 227-228.

American Mineralogist: 72: 1225-1229.

Internet Links for Grischunite

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    • Localities for Grischunite

    The 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.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Switzerland
     
    • Grischun (Grisons; Graubünden)
      • Albula Valley
        • Oberhalbstein (Surses; Sursass)
          • Tinizong (Tinzen)
    		[Schweiz.Min.Petr.Mitt.(1984) 64,; Nickel & Nichols, 1991, 80 - "Mineral Reference Manual"]
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