Grechishchevite Mineral Data

Grechishchevite Mineral Data
Search Webmineral :
   
Home Crystal jmol jPOWD Chem X Ray Dana Strunz Properties A to Z Images       News Help About


Desert Winds Gems and Minerals
[Mineral Galleries] [About Me] [e-Bay Items] [Latest News] [How to Order]
A Diverse Selection of Beautifully Unique Gem & Mineral Specimens
Desert Winds Gems & Minerals • For All Levels of Collectors Worldwide
Aesthetic & Rare Mineral Specimens • Regular Updates


General Grechishchevite Information

Help on Chemical Formula: Chemical Formula: Hg3S2(Br,Cl,I)2
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Hg3S2BrCl0.6I0.4
Help on Environment: Environment: In the oxidation zone in fractures of a mercury deposit.
Help on IMA Status: IMA Status: Approved IMA 1990
Help on Locality: Locality: Arzak and Kadyrel mercury deposits, Tuva, Siberia, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Oleg Konstantinovich Grechishchev, Russian engineering geologist, long-time student of mercury ores from Tuva, Siberia.
Help on Name Pronunciation: Name Pronunciation: Grechishchevite + Pronunciation Say GRECHISHCHEVITE
 

Grechishchevite Image

Click Here for Larger Grechishchevite Image in a New Browser Window Images:
Click Here for Larger Grechishchevite Image

Grechishchevite

Comments: Red grechishchevite coatings on calcite.
Location: Kadyrel' Hg occurrence, Oorash-Khem River Valley, Uyuk Range, Pii-Khem District, Tuva Republic, Eastern-Siberian Region, Russia. Scale: Picture Size 2 mm.
© Jeff Weissman / Photographic Guide to Mineral Species

Grechishchevite Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:0.65671
Help on Cell Dimensions: Cell Dimensions: a = 13.225, c = 8.685, Z = 8; V = 1,519.01 Den(Calc)= 7.15
Help on Crystal System: Crystal System: TetragonalSpace Group: P 42m-,P 4m2,P 4mm,P 4/mmm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.65(1), 3.02(0.6), 3.95(0.6),
Click Here for Large Grechishchevite Structure Window Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
 Help on Above


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

Help on Cleavage: Cleavage: {???} Good
Help on Color: Color: Brownish black, Orange, Reddish orange.
Help on Density: Density: 7.16
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luster: Luster: Vitreous - Adamantine
Help on Streak: Streak: deep yellow
 

Optical Properties of Grechishchevite

Help on Dichroism (e): Dichroism (e): yellow.
Help on Dichroism (w): Dichroism (w): straw yellow.
Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Uniaxial (+), w=2, e=2, bire=0.0000.
Help on RL Color: RL Color: Gray wihte with strong internal orange reflections.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Grechishchevite in Air
λ R1 R2  ∑ 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
Relative
Intensity		    0%   60% 100% 120% 180% 240% 300% 360% 420% 480% 530%
R1                      
R2                      
 

Calculated Properties of Grechishchevite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.92 gm/cc
note: Specific Gravity of Grechishchevite =7.15 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.22
Boson Index = 0.78
Help on Photoelectric: Photoelectric: PEGrechishchevite =1,293.80 barns/electron
U=PEGrechishchevite x rElectron Density=7,655.34 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Grechishchevite is Not Radioactive
 

Grechishchevite Classification
Help on Dana Class: 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
Help on Strunz Class: 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
Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: 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 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info

Search for Grechishchevite using:

Google
 
Web webmineral.com
[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Grechishchevite :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Desert Winds Gems and Minerals

Excalibur Minerals

Exceptional Minerals

Fabre Minerals

Heliodor

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Grechishchevite Mineral Data :

Ask about Grechishchevite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espaņol

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: