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Gerstleyite Mineral Data
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General Gerstleyite Information
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Chemical Formula: |
Na2(Sb,As)8S13•2(H2O) |
Composition: |
Molecular Weight = 1,426.04 gm |
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Sodium 3.22 % Na |
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Antimony 59.76 % Sb |
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Arsenic 5.25 % As |
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Hydrogen 0.28 % H |
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Sulfur 29.23 % S |
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Oxygen 2.24 % O |
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______ |
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100.00 % |
Empirical Formula: |
Na2Sb7AsS13•2(H2O) |
Environment: |
Sedimentary borate deposits. |
IMA Status: |
Valid Species (Pre-IMA) 1956 |
Locality: |
Baker Mine, Boron, Kern Co. California. Link to MinDat.org Location Data. |
Name Origin: |
Named for J. M. Gerstley (1907-), President, Pacific Coast Borax Company. |
Name Pronunciation: |
Gerstleyite + Pronunciation |
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Gerstleyite Image |
Images:
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Gerstleyite
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 |
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Gerstleyite Crystallography
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Axial Ratios: |
a:b:c =0.4299:1:0.3078 |
Cell Dimensions: |
a = 9.911, b = 23.05, c = 7.097, Z = 2; beta = 127.85° V = 1,280.21 Den(Calc)= 3.70 |
Crystal System: |
Monoclinic - Domatic H-M Symbol (m) Space Group: Cm |
X Ray Diffraction: |
By Intensity(I/Io): 11.85(1), 3.05(0.9), 5.64(0.7), |
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Physical Properties of Gerstleyite
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Cleavage: |
{010} Perfect, {100} Perfect, {001} Indistinct |
Color: |
Vermilion, Black. |
Density: |
3.62 |
Habit: |
Fibrous - Crystals made up of fibers. |
Habit: |
Platy - Sheet forms (e.g. micas). |
Habit: |
Spherical - Spherical, rounded aggregates. |
Hardness: |
2.5 - Finger Nail |
Luster: |
Adamantine |
Streak: |
vermilion |
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Optical Properties of Gerstleyite
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Optical Data: |
Biaxial (?), b=2.1 |
Pleochroism (x): |
salmon red. |
Pleochroism (y): |
deep blood red. |
Pleochroism (z): |
deep blood red. |
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Calculated Properties of Gerstleyite
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Electron Density: |
Bulk Density (Electron Density)=3.32 gm/cc note: Specific Gravity of Gerstleyite =3.70 gm/cc. |
Fermion Index: |
Fermion Index = 0.0022035847 Boson Index = 0.9977964153 |
Photoelectric: |
PEGerstleyite = 201.33 barns/electron U=PEGerstleyite x rElectron Density= 668.64 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Gerstleyite is Not Radioactive |
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Gerstleyite Classification
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Dana Class: |
03.08.08.01 (03)Sulfides - Sulfosalts |
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(03.08)where 1 < z/y <2 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals |
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(03.08.08)Dana Group |
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03.08.08.01 Gerstleyite Na2(Sb,As)8S13•2(H2O) Cm m |
Strunz Class: |
02.HE.05 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.H - Sulfosalts of SnS Archetype |
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02.HE -With alkalies, H2O |
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02.HE.05 Gerstleyite Na2(Sb,As)8S13•2(H2O) Cm m |
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Other Gerstleyite Information
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References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8) |
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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Print or Cut-and-Paste your Gerstleyite Specimen Label here :
Gerstleyite
Na2(Sb,As)8S13•2(H2O)
Dana No: 03.08.08.01 Strunz No: 02.HE.05
Locality:
Notes:
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