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Gerstleyite

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Formula:
Na2(Sb,As)8S13 · 2H2O
System:
Monoclinic
Colour:
Cinnabar red, darkening ...
Lustre:
Sub-Adamantine
Hardness:
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.


Classification of Gerstleyite

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 Gerstleyite

Sub-Adamantine
Diaphaneity (Transparency):
Translucent
Colour:
Cinnabar red, darkening on exposure
Streak:
Bright cinnabar red
Hardness (Mohs):
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 Gerstleyite

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

Chemical Properties of Gerstleyite

Formula:
Na2(Sb,As)8S13 · 2H2O
Elements listed in formula:
Analytical Data:
The analysis is not very good totalling 92%. The structure determination must have used better
             1         2        3
Na         4.28      4.65      3.29
Li         0.135     0.15
Sb        47.80     51.91     55.74
As         7.38      8.02      8.57
S         27.01     29.33     29.82
H^2O       5.47      5.94      2.58
gangue     n.d.
Total     92.07    100.00    100.00
1) Type material 2) same corrected to 100% 3)Na^2(Sb,As)^8S^13.2H^2O
Common Impurities:
Li

Crystallography of Gerstleyite

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 Volume:
V 1,280.21 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Fibrous and platy
X-Ray 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

Occurrences of Gerstleyite

Type Occurrence of Gerstleyite

Place of Conservation of Type Material:
Smithsonian, Harvard
Geological Setting of Type Material:
Low temperature Borate evaporite

Relationship of Gerstleyite to other Species

2.HE.10Ambrinoite[K,(NH4)]2(As,Sb)6(Sb,As)2S13 · H2O

Other Names for Gerstleyite

Name in Other Languages:

Other Information

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 Gerstleyite

Reference List:
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 Gerstleyite

mindat.org URL:
https://www.mindat.org/min-1684.html
Please feel free to link to this page.
Specimens:
The following Gerstleyite specimens are currently listed for sale on minfind.com.

Localities for Gerstleyite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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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