Chambersite

Chambersite is named after its discovery locality, at Barkers Hill salt dome, Chambers County, Texas, USA. The material of sufficient size for cutting has (so far) been found only at this site, and the Venice Salt Dome, in Plaqueminers Parish, Louisiana.

There, very small transparent stones of pale brown to deep purple colour have been recovered. Crystals are nearly always tetrahedral shaped, and when faceted are more polished than actually cut.
General Information
Chemical Formula
Mn
 
3
B
 
7
O
 
13
Cl
Michael O’Donoghue, Gems, Sixth Edition (2006)
Photos of natural/un-cut material from mindat.org
Physical Properties of Chambersite
Mohs Hardness7
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
Specific Gravity3.50
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
FractureUneven,Sub-Conchoidal
Anthony et al, Handbook of mineralogy (2001)
Light SensitivityDarkens with exposure to sunlight.
Anthony et al, Handbook of mineralogy (2001)
Optical Properties of Chambersite
Refractive Index1.735 to 1.745
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
Optical CharacterBiaxial
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
Birefringence0.010
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
Colour
Colour (General)Colourless, red, brownish
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
TransparencyTransparent
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
LustreVitreous
Anthony et al, Handbook of mineralogy (2001)
Crystallography of Chambersite
Crystal SystemOrthorhombic
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
HabitPseudocubic
Michael O’Donoghue, Gems, Sixth Edition (2006)
More from other references
Geological Environment
Where found:In brine residues from extraction wells in salt domes.
Anthony et al, Handbook of mineralogy (2001)
Further Information
Mineral information:Chambersite information at mindat.org
Significant Gem Localities
USA
 
  • Texas
    • Chambers Co.
      • Mont Belvieu
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 397
Copyright © Jolyon & Katya Ralph 1993-2019. Site Map. Locality, gem & photograph data are the copyright of the individuals who submitted them. For more information please contact the . Gemdat.org is an online information resource dedicated to providing free gemmological information to all.