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Gerstleyite

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Formula:
Na2(Sb,As)8S13 · 2H2O
Colour:
Cinnabar red, darkening on exposure
Lustre:
Sub-Adamantine
Hardness:
Specific Gravity:
3.62
Crystal System:
Monoclinic
Name:
James Mack Gerstley (11 November 1907, London, England - 2 June 2007, San Francisco, California, USA), president of the Pacific Coast Borax Company (later the United States Borax & Chemical Corporation) from 1933-1961. He was inducted into the US National Mining Hall of Fame in 2003.
As as red spherules with fibrous to platy structue up to 2.5 cm in clay with borates. This was the first known sodium sulfosalt.


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Classification of GerstleyiteHide

Approved, 'Grandfathered' (first described prior to 1959)
First Published:
1956
2.HE.05

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
H : Sulfosalts of SnS archetype
E : With alkalies, H2O
3.8.8.1

3 : SULFOSALTS
8 : 1 < ø < 2
5.0.1

5 : Sulphosalts - Sulpharsenites and Sulphobismuthites (those containing Sn, Ge,or V are in Section 6)
0 : Sulpharsenites etc. of the alkali metals

Physical Properties of GerstleyiteHide

Sub-Adamantine
Transparency:
Translucent
Colour:
Cinnabar red, darkening on exposure
Streak:
Bright cinnabar red
Hardness:
2½ on Mohs scale
Hardness Data:
Measured
Tenacity:
Brittle
Cleavage:
Perfect
Perfect on 010 and 100, Poor on 001
Fracture:
None observed
Density:
3.62 g/cm3 (Measured)    3.723 g/cm3 (Calculated)

Optical Data of GerstleyiteHide

Type:
Biaxial
Dispersion:
r < v extreme
Pleochroism:
Weak
Comments:
X= salmon red, Y=Z= deep blood red

Chemical Properties of GerstleyiteHide

Formula:
Na2(Sb,As)8S13 · 2H2O
Common Impurities:
Li

Crystallography of GerstleyiteHide

Crystal System:
Monoclinic
Class (H-M):
m - Domatic
Space Group:
Bm
Cell Parameters:
a = 9.911 Å, b = 23.05 Å, c = 7.097 Å
β = 127.85°
Ratio:
a:b:c = 0.43 : 1 : 0.308
Unit Cell V:
1,280.21 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Fibrous and platy

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
11.85 (100)
3.05 (90)
5.64 (70)
4.03 (70)
2.81 (50)
2.739 (40)
1.934 (40)
Comments:
From type material at Baker Mine, Kern Co., Ca., USA

Type Occurrence of GerstleyiteHide

Other Language Names for GerstleyiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Kernite4 photos of Gerstleyite associated with Kernite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

2.HE.10Ambrinoite[K,(NH4)]2(As,Sb)6(Sb,As)2S13 · H2OTric. 1 : P1

Related Minerals - Dana Grouping (8th Ed.)Hide

3.8.8.2Ambrinoite[K,(NH4)]2(As,Sb)6(Sb,As)2S13 · H2OTric. 1 : P1

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Industrial Uses:
none

References for GerstleyiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Frondel, C. Morgan, V. (1956) Inderite and Gerstleyite from the Kramer borate district, Kern Co. California. American Mineralogist: 41: 839-843.
Nakai, I. Appleman, D.E. (1981) The crystal structure of gerstleyite Na^2(Sb.As)^8S^13·2H^2O: the first sulfosalt mineral of sodium. Chemistry Letters: 10: 1327-1330.
Geological Society of America, Program with Abstracts: 11(7): 485.
Chemical Abstracts: 95: 195617y.
Frost, R.L., Bahfenne, S., Keeffe, E.C. (2010) Raman spectroscopic study of the mineral gerstleyite Na2(Sb,As)8S13·2H2O and comparison with some heavy-metal sulfides. Journal of Raman Spectroscopy, 41(12), 1779-1783.
Handbook vol 1, pg 181.

Internet Links for GerstleyiteHide

Localities for GerstleyiteHide

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

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
USA
 
  • California
    • Kern Co.
      • Kramer District (Kramer Borate District)
www.mineralsocal.org
Morgan, V. and Erd, R.C. (1969) Minerals of the Kramer borate district, California California Division of Mines and Geology Mineral Information Service: 22: 147, 152; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 132, 137.
Frondel, Clifford & V. Morgen (1956), Inderite and gerstleyite from the Kramer borate district, Kern County, California: American Mineralogist: 41: 839-843; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 198.
American Mineralogist 41 (1956), 839-843
            • West Baker
collected by Rock Currier
Mineral and/or Locality  
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