Grechishchevite (original) (raw)

A valid IMA mineral species

About GrechishcheviteHide

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Formula:

Hg2+3S2(Br,Cl,I)2

Colour:

Bright or dark orange, slowly darkening to brown-orange, then black.

Lustre:

Adamantine, Vitreous

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 (Олег Константинович Гречищев) (1936 – 2014), Institute of Geology, Novosibirsk, Russia, who did significant work on the Tuva mercury deposits.

This page provides mineralogical data about Grechishchevite.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:1744:8

db434989-d61e-4132-8a82-1d90aa6d9546

IMA Classification of GrechishcheviteHide

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IMA Formula:

Hg3S2BrCl0.5I0.5

Type description reference:

Classification of GrechishcheviteHide

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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

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Physical Properties of GrechishcheviteHide

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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:

VHN25=88 - 116 kg/mm2 - Vickers

Cleavage:

Distinct/Good
Distinct cleavage parallel to prism elongation.

Density:

7.23 g/cm3 (Measured) 7.16 g/cm3 (Calculated)

Comment:

Measured on synthetic material

Optical Data of GrechishcheviteHide

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RI values:

_n_ω = 2.000 _n_ε = 2.000

δ = 0.000

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Bireflectance:

Distinct, gray-white (R'e) to gray (R'o)

Reflectivity:

Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 24.5%.
R1 shown in black, R2 shown in red

Colour in reflected light:

Gray-white

Internal Reflections:

Strong, light orange and orange

Comments:

Straw-yellow (E) to yellow (0).

Comments:

ω = > 2.0 ε = > 2.0

Chemistry of GrechishcheviteHide

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Mindat Formula:

Hg2+3S2(Br,Cl,I)2

Crystallography of GrechishcheviteHide

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Crystal System:

Tetragonal

Cell Parameters:

a = 13.2 Å, c = 6.69 Å

Unit Cell V:

1,165.67 ų (Calculated from Unit Cell)

Morphology:

prismatic crystals, granular, to 0.3 mm; in coatings and powdery masses

Comment:

Point Group: 4/m2/m2/m, 42m,or 4mm.; Space Group: [P4/mmm, P42m, or P4mm] (by analogy to synthetic material).

Crystal StructureHide

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ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0005919	Grechishchevite	Pervukhina N V, Vasil'ev V I, Borisov S V, Magarill S A, Naumov D Y (2003) The crystal structure of a polymorph of Hg3S2Br1Cl.5I.5 The Canadian Mineralogist 41 1445-1453		2003	synthetic	0	293

CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of GrechishcheviteHide

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General Appearance of Type Material:

Occurs on fracture walls as films consisting of minute prisms and groups of equant to slightly elongate grains to 0.2 mm (Arzak deposit); also as powdery masses and as concretions of short prismatic crystals to 0.3 mm (Kadyrel occurrence).

Place of Conservation of Type Material:

Central Siberian Geological Museum, Novosibirsk, Russia, number VI-31/1 (type).
Fersman Mineralogical Museum, Moscow, Russia, number 87988-90 (type).
Mining Museum, St. Petersburg, Russia, number 503/1, 503/2 (type).

Associated Minerals at Type Locality:

Reference:

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.

Synonyms of GrechishcheviteHide

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Other Language Names for GrechishcheviteHide

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Related Minerals - Strunz-mindat GroupingHide

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Other InformationHide

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Notes:

Fragments blacken in 40% KOH; unaffected by HCl or HNO3.

Health Risks:

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

Internet Links for GrechishcheviteHide

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References for GrechishcheviteHide

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Reference List:

Pervukhina, N.V., Borisov, S.V., Magarill, S.A., Naumov, D.Yu., Vasil'ev, V.I., Nenashev, B.G. (2004) Zhurnal Strukturnoj Khimii: 45(3); 462-470.

Localities for GrechishcheviteHide

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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

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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.