Grechishchevite Mineral Data (original) (raw)

General Grechishchevite Information

Chemical Formula:

Hg3S2(Br,Cl,I)2

Composition:

Molecular Weight = 817.84 gm

Mercury 73.58 % Hg 76.51 % Hg2O

Sulfur 7.84 % S 7.84 % S2-

- % S -3.91 % -O=S

Iodine 6.21 % I 6.21 % I

- % I -0.39 % -O=I2

Bromine 9.77 % Br 9.77 % Br

- % Br -0.98 % -O=Br2

Chlorine 2.60 % Cl 2.60 % Cl

- % Cl -0.59 % -O=Cl2

______ ______

100.00 % 97.07 % = TOTAL OXIDE

Empirical Formula:

Hg3S2BrCl0.6I0.4

Environment:

In the oxidation zone in fractures of a mercury deposit.

IMA Status:

Approved IMA 1990

Locality:

Arzak and Kadyrel mercury deposits, Tuva, Siberia, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Oleg Konstantinovich Grechishchev, Russian engineering geologist, long-time student of mercury ores from Tuva, Siberia.

Name Pronunciation:

Grechishchevite + Pronunciation

Grechishchevite Image

Images:

Grechishchevite Crystallography

Axial Ratios:

a:c = 1:0.65671

Cell Dimensions:

a = 13.225, c = 8.685, Z = 8; V = 1,519.01 Den(Calc)= 7.15

Crystal System:

TetragonalSpace Group: P 42m-,P 4m2,P 4mm,P 4/mmm

X Ray Diffraction:

By Intensity(I/Io): 2.65(1), 3.02(0.6), 3.95(0.6),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
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| | Pervukhina N V , Vasil ev V I , Borisov S V , Magarill S A , Naumov D Y , The Canadian Mineralogist , 41 (2003) p.1445-1453, The crystal structure of a polymorph of Hg3S2Br1Cl.5I.5, Locality: synthetic | | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |

Physical Properties of Grechishchevite

Cleavage:

{???} Good

Color:

Brownish black, Orange, Reddish orange.

Density:

7.16

Diaphaneity:

Transparent

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

2.5 - Finger Nail

Luster:

Vitreous - Adamantine

Streak:

deep yellow

Optical Properties of Grechishchevite

Dichroism (e):

yellow.

Dichroism (w):

straw yellow.

Gladstone-Dale:

CI meas= 0.091 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.09 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1399,KPDmeas= 0.1397,KC= 0.1537
Ncalc = 2.1

Optical Data:

Uniaxial (+), w=2, e=2, bire=0.0000.

RL Color:

Gray wihte with strong internal orange reflections.

Reflectivity

Standardized Intensity (100%) Reflection Spectra of Grechishchevite in Air

λ	R1	R 2		∑ R1(λ)	∑ R2(λ)
436 nm	22.80	19.20
460 nm	24.50	22.20
500 nm	21.40	18.90
546 nm	19.80	17.30
590 nm	18.80	16.50
620 nm	18.90	16.70
656 nm	18.10	15.90

Calculated Relative Intensity Colors of Grechishchevite in Air

Calculated Properties of Grechishchevite

Electron Density:

Bulk Density (Electron Density)=5.92 gm/cc
note: Specific Gravity of Grechishchevite =7.15 gm/cc.

Fermion Index:

Fermion Index = 0.22
Boson Index = 0.78

Photoelectric:

PEGrechishchevite =1,293.80 barns/electron
U=PEGrechishchevite x rElectron Density=7,655.34 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Grechishchevite is Not Radioactive

Grechishchevite Classification

Dana Class:

10.03.05.01 (10)Oxyhalides and Hydroxyhalides

(10.03)where (A)3 (O,OH)2 Xq

(10.03.05)Dana Group

10.03.05.01 Grechishchevite Hg3S2(Br,Cl,I)2 P 42m-,P 4m2,P 4mm,P 4/mmm Tetra

Strunz Class:

02.FC.15c 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.F - Sulfides of Arsenic, Alkalies; Sulfides with Halide, Oxide, Hydroxide, H2O

02.FC -With Cl, Br, I (halide-sulfides)

02.FC.15c Grechishchevite Hg3S2(Br,Cl,I)2 P 42m-,P 4m2,P 4mm,P 4/mmm Tetra

Other Grechishchevite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic3)

See Also:

Links to other databases for Grechishchevite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Print or Cut-and-Paste your Grechishchevite Specimen Label here :

Grechishchevite

Hg3S2(Br,Cl,I)2
Dana No: 10.03.05.01 Strunz No: 02.FC.15c
Locality:

Notes: