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Grechishchevite

Big Photo

Kadyrel' Hg occurrence, Oorash-Khem River Valley, Uyuk Range, Pii-Khem District, Tuva Republic, Eastern-Siberian Region, Russia
© 2008, JGW

Formula:
Hg
2+
3
[(Br,Cl,I)
 
2
|S
 
2
]
System:TetragonalHardness:2½
This page provides mineralogical data about Grechishchevite.

Classification of Grechishchevite

IMA status:Approved
Strunz 8th edition ID:2/F.14-20
Nickel-Strunz 10th (pending) edition ID:2.FC.15c

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
F : Sulfides of arsenic, alkalies; sulfides with halide, oxide, hydroxide, H2O
C : With Cl, Br, I (halide-sulfides)
Dana 8th edition ID:10.3.5.1

10 : OXYHALIDES AND HYDROXYHALIDES
3 : A3(O,OH)2Xq
Hey's CIM Ref.:6.5.4

6 : Sulphosalts - Sulphostannates, Sulphogermanates,Sulpharsenates, Sulphantimonates, Sulphovanadates and Sulphohalides
5 : Sulphohalides
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Type Occurrence of Grechishchevite

Co-type Localities:Arzak Hg occurrence (Arzakskoye), Uyuk Range, Pii-Khem District, Tuva Republic, Eastern-Siberian Region, Russia
Kadyrel' Hg occurrence, Oorash-Khem River Valley, Uyuk Range, Pii-Khem District, Tuva Republic, Eastern-Siberian Region, Russia
Year of Discovery:1989

Physical Properties of Grechishchevite

Hardness (Mohs):2½

Crystallography of Grechishchevite

Crystal System:Tetragonal
Cell Parameters:a = 13.2Å, c = 6.69Å
Ratio:a:c = 1 : 0.507
Unit Cell Volume:V 1,165.67 ų (Calculated from Unit Cell)

Optical Data of Grechishchevite

Type:Uniaxial (+)
RI values: nω = 2.000 nε = 2.000
Maximum Birefringence:δ = 0.000

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High

Chemical Properties of Grechishchevite

Formula:
Hg
2+
3
[(Br,Cl,I)
 
2
|S
 
2
]
Essential elements:Br, Hg, S
All elements listed in formula:Br, Cl, Hg, I, S

Relationship of Grechishchevite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
2.FC.05Djerfisherite
K
 
6
(Cu,Fe,Ni)
 
25
S
 
26
Cl
2.FC.05Thalfenisite
Tl
 
6
(Fe,Ni,Cu)
 
25
S
 
26
Cl
2.FC.05Owensite
(Ba,Pb)
 
6
(Cu,Fe,Ni)
 
25
S
 
27
2.FC.10Bartonite
K
 
3
Fe
 
10
S
 
14
2.FC.10Chlorbartonite
K6Fe24S26(Cl,S)
2.FC.15aArzakite
Hg
2+
3
[(Br,Cl)
 
2
|S
 
2
]
2.FC.15aCorderoite
Hg
2+
3
[Cl
 
2
|S
 
2
]
2.FC.15aLavrentievite
Hg
2+
3
[(Cl,Br)
 
2
|S
 
2
]
2.FC.15dRadtkeite
Hg
2+
3
[Cl|I|S
 
2
]
2.FC.15bKenhsuite
Hg
2+
3
[Cl
 
2
|S
 
2
]
2.FC.20aCapgaronnite
HgS·Ag(Cl,Br,I)
2.FC.20cPerroudite
Hg
 
5
Ag
 
4
S
 
5
I
 
2
Cl
 
2
2.FC.20bIltisite
HgSAg(Cl,Br)
2.FC.25Demicheleite-(Br)
BiSBr
2.FC.25Demicheleite-(Cl)
BiSCl
Related Minerals - Hey's Index Grouping:

- +
6.5.1Corderoite
Hg
2+
3
[Cl
 
2
|S
 
2
]
6.5.2Arzakite
Hg
2+
3
[(Br,Cl)
 
2
|S
 
2
]
6.5.3Lavrentievite
Hg
2+
3
[(Cl,Br)
 
2
|S
 
2
]
6.5.5Radtkeite
Hg
2+
3
[Cl|I|S
 
2
]
6.5.6Capgaronnite
HgS·Ag(Cl,Br,I)
6.5.7Perroudite
Hg
 
5
Ag
 
4
S
 
5
I
 
2
Cl
 
2
6.5.8Ardaite
Pb
 
19
Sb
 
13
S
 
35
Cl
 
7
6.5.9Dadsonite
Pb
 
23
Sb
 
25
S
 
60
Cl
6.5.10Radhakrishnaite
PbTe
 
3
(Cl,S)
 
2
6.5.11Djerfisherite
K
 
6
(Cu,Fe,Ni)
 
25
S
 
26
Cl
6.5.12Thalfenisite
Tl
 
6
(Fe,Ni,Cu)
 
25
S
 
26
Cl

Other Names for Grechishchevite

Synonyms:
IMA1988-027
Other Languages:
German:Grechishchevit
Russian:Гречищевит
Spanish:Grechishchevita

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 Grechishchevite

Reference List:American Mineralogist: 76: 1729-1730.

Internet Links for Grechishchevite

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    Localities for Grechishchevite

    Hide Locality List
    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.
    (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.
    Russia
     
    • Eastern-Siberian Region
      • Tuva Republic
        • Pii-Khem District
          • Uyuk Range
    		Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
            • Oorash-Khem River Valley
    		Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
    Mineral and/or Locality
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