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Grechishchevite

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About GrechishcheviteHide

Formula:
Hg2+3S2(Br,Cl,I)2
Colour:
Bright or dark orange, slowly darkening to brown-orange, then black.
Lustre:
Adamantine, Vitreous
Hardness:
Crystal System:
Tetragonal
Name:
Named by V.I. Vasil’ev, L.V. Usova, and N.A. Pal’chik in 1989 in honor of Oleg Konstantinovich Grechishchev (Олега Константиновича Гречищева) (1936 – ), Institute of Geology, Novosibirsk, Russia, who did significant work on the Tuva mercury deposits.
This page provides mineralogical data about Grechishchevite.


Classification of GrechishcheviteHide

Approved
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)
10.3.5.1

10 : OXYHALIDES AND HYDROXYHALIDES
3 : A3(O,OH)2Xq
6.5.4

6 : Sulphosalts - Sulphostannates, Sulphogermanates,Sulpharsenates, Sulphantimonates, Sulphovanadates and Sulphohalides
5 : Sulphohalides

Physical Properties of GrechishcheviteHide

Adamantine, Vitreous
Comment:
Luster vitreous to adamantine.
Colour:
Bright or dark orange, slowly darkening to brown-orange, then black.
Streak:
deep yellow to yellow with a slight orange tint
Hardness:
2½ on Mohs scale

Optical Data of GrechishcheviteHide

Type:
Uniaxial (+)
RI values:
nω = 2.000 nε = 2.000
Max Birefringence:
δ = 0.000
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High

Chemical Properties of GrechishcheviteHide

Formula:
Hg2+3S2(Br,Cl,I)2
IMA Formula:
Hg3S2BrCl0.5I0.5

Crystallography of GrechishcheviteHide

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

Type Occurrence of GrechishcheviteHide

Synonyms of GrechishcheviteHide

Other Language Names for GrechishcheviteHide

Related Minerals - Nickel-Strunz GroupingHide

2.FC.Demicheleite-(I)BiSIOrth. mmm (2/m 2/m 2/m) : Pnma
2.FC.05DjerfisheriteK6(Fe,Cu,Ni)25S26ClIso. m3m (4/m 3 2/m) : Pm3m
2.FC.05ThalfenisiteTl6(Fe,Ni,Cu)25S26Cl
2.FC.05Owensite(Ba,Pb)6(Cu,Fe,Ni)25S27Iso. m3m (4/m 3 2/m) : Pm3m
2.FC.10BartoniteK6Fe20S26STet. 4/mmm (4/m 2/m 2/m) : I4/mmm
2.FC.10ChlorbartoniteK6Fe24S26(Cl,S)Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm
2.FC.15aArzakiteHg2+3S2(Br,Cl)2Mon.
2.FC.15aCorderoiteHg2+3S2Cl2Iso. m3 (2/m 3)
2.FC.15aLavrentieviteHg2+3S2(Cl,Br)2Mon.
2.FC.15dRadtkeiteHg2+3S2IClMon. 2/m : B2/m
2.FC.15bKenhsuiteHg2+3S2Cl2Orth.
2.FC.20aCapgaronniteAgHgClSOrth.
2.FC.20cPerrouditeHg5Ag4S5(I,Br)2Cl2Orth. 2 2 2 : P21 21 2
2.FC.20bIltisiteHgAgS(Cl,Br)Hex.
2.FC.25Demicheleite-(Br)BiSBrOrth. mmm (2/m 2/m 2/m) : Pnma
2.FC.25Demicheleite-(Cl)BiSClOrth. mmm (2/m 2/m 2/m) : Pnma

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

6.5.1CorderoiteHg2+3S2Cl2Iso. m3 (2/m 3)
6.5.2ArzakiteHg2+3S2(Br,Cl)2Mon.
6.5.3LavrentieviteHg2+3S2(Cl,Br)2Mon.
6.5.5RadtkeiteHg2+3S2IClMon. 2/m : B2/m
6.5.6CapgaronniteAgHgClSOrth.
6.5.7PerrouditeHg5Ag4S5(I,Br)2Cl2Orth. 2 2 2 : P21 21 2
6.5.8ArdaitePb19Sb13S35Cl7Mon.
6.5.9DadsonitePb23Sb25S60ClTric. 1 : P1
6.5.10RadhakrishnaitePbTe3(Cl,S)2Tet.
6.5.11DjerfisheriteK6(Fe,Cu,Ni)25S26ClIso. m3m (4/m 3 2/m) : Pm3m
6.5.12ThalfenisiteTl6(Fe,Ni,Cu)25S26Cl

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 GrechishcheviteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Vasil’ev, V.I., Usova, L.V., Pal’chik, N.A. (1989) Grechishchevite – Hg3S2(Br,Cl,I)2 – a new supergene mercury sulfohalide. Geologiya i Geofizika: 30: 61–69. (in Russian)
Jambor, J.L., Puziewicz, J. (1991) New mineral names. American Mineralogist: 76: 1728-1735.

Internet Links for GrechishcheviteHide

Localities for GrechishcheviteHide

ⓘ - 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.
Russia (TL)
 
  • 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; Pervukhina, N. V., Vasil’ev, V. I., Borisov, S. V., Magarill, S. A., & Naumov, D. Y. (2003). The crystal structure of a polymorph of Hg2+ 3S2Br1. 0Cl0. 5I0. 5. The Canadian Mineralogist, 41(6), 1445-1453.
        • Oorash-Khem River Valley
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow; Pervukhina, N. V., Vasil’ev, V. I., Borisov, S. V., Magarill, S. A., & Naumov, D. Y. (2003). The crystal structure of a polymorph of Hg2+ 3S2Br1. 0Cl0. 5I0. 5. The Canadian Mineralogist, 41(6), 1445-1453.
Mineral and/or Locality  
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