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Gerstleyite Mineral Data

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General Gerstleyite Information

Help on Chemical  Formula: Chemical Formula: Na2(Sb,As)8S13•2(H2O)
Help on Composition: Composition: Molecular Weight = 1,426.04 gm
   Sodium     3.22 %  Na
   Antimony  59.76 %  Sb
   Arsenic    5.25 %  As
   Hydrogen   0.28 %  H
   Sulfur    29.23 %  S
   Oxygen     2.24 %  O
            100.00 % 
Help on Empirical Formula: Empirical Formula: Na2Sb7AsS13•2(H2O)
Help on Environment: Environment: Sedimentary borate deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1956
Help on Locality: Locality: Baker Mine, Boron, Kern Co. California. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for J. M. Gerstley (1907-), President, Pacific Coast Borax Company.
Help on Name Pronunciation: Name Pronunciation: Gerstleyite + Pronunciation Say GERSTLEYITE

Gerstleyite Image

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Comments: Small prismatic crystals and massive cinnabar-red gerstleyite on matrix.
Location: Baker mine, U.S. Borax Mine, Boron, Kramer District, Kern Co., California, USA. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Gerstleyite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4299:1:0.3078
Help on Cell Dimensions: Cell Dimensions: a = 9.911, b = 23.05, c = 7.097, Z = 2; beta = 127.85° V = 1,280.21 Den(Calc)= 3.70
Help on Crystal System: Crystal System: Monoclinic - Domatic H-M Symbol (m) Space Group: Cm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 11.85(1), 3.05(0.9), 5.64(0.7),

Physical Properties of Gerstleyite

Help on Cleavage: Cleavage: {010} Perfect, {100} Perfect, {001} Indistinct
Help on Color: Color: Vermilion, Black.
Help on Density: Density: 3.62
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Habit: Habit: Spherical - Spherical, rounded aggregates.
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luster: Luster: Adamantine
Help on Streak: Streak: vermilion

Optical Properties of Gerstleyite

Help on Optical Data: Optical Data: Biaxial (?), b=2.1
Help on Pleochroism (x): Pleochroism (x): salmon red.
Help on Pleochroism (y): Pleochroism (y): deep blood red.
Help on Pleochroism (z): Pleochroism (z): deep blood red.

Calculated Properties of Gerstleyite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.32 gm/cc
note: Specific Gravity of Gerstleyite =3.70 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0022035847
Boson Index = 0.9977964153
Help on Photoelectric: Photoelectric: PEGerstleyite = 201.33 barns/electron
U=PEGerstleyite x rElectron Density= 668.64 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Gerstleyite is Not Radioactive

Gerstleyite Classification

Help on  Dana Class: Dana Class: (03)Sulfides - Sulfosalts
  (03.08)where 1 < z/y <2 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.08.08)Dana Group Gerstleyite Na2(Sb,As)8S13•2(H2O) Cm m
Help on  Strunz Class: Strunz Class: 02.HE.05 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.H - Sulfosalts of SnS Archetype
  02.HE -With alkalies, H2O
02.HE.05 Gerstleyite Na2(Sb,As)8S13•2(H2O) Cm m

Other Gerstleyite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Gerstleyite :
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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Dana No: Strunz No: 02.HE.05





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