Boleite

Boleite was named after El Boleo mine, on the Baja Peninsula, near Santa Rosalia, Mexico, where it was first collected as a very minor ore of silver, copper and lead.

Boleite forms deep blue cubes over half an inch on each side, which consist of pseudo-octahedral tetragonal dipyramids.

Soft, cleavable, twinned crystals of boleite are very difficult to facet.

Boleite Gemstones by Colour

This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
 
General Information
Chemical Formula
Pb
 
26
Ag
 
10
Cu
 
24
Cl
 
62
(OH)
 
48
· 3H
 
2
O
Walter Schumann, Gemstones of the world (2001)
More from other references
Photos of natural/un-cut material from mindat.org
Physical Properties of Boleite
Mohs Hardness3 to 3.5
Michael O’Donoghue, Gems, Sixth Edition (2006)
More from other references
Specific Gravity5.05
Michael O’Donoghue, Gems, Sixth Edition (2006)
More from other references
Cleavage QualityPerfect
Michael O’Donoghue, Gems, Sixth Edition (2006)
More from other references
FractureUneven
Arthur Thomas, Gemstones (2009)
Optical Properties of Boleite
Refractive Index2.05
Michael O’Donoghue, Gems, Sixth Edition (2006)
More from other references
Optical CharacterUniaxial/-
Arthur Thomas, Gemstones (2009)
Birefringence0.010
Arthur Thomas, Gemstones (2009)
Dispersion0.071
Arthur Thomas, Gemstones (2009)
Colour
Colour (General)Deep Prussian blue to indigo
Michael O’Donoghue, Gems, Sixth Edition (2006)
More from other references
TransparencyTransparent,Translucent
Walter Schumann, Gemstones of the world (2001)
More from other references
LustreVitreous,Pearly
Arthur Thomas, Gemstones (2009)
Crystallography of Boleite
Crystal SystemIsometric
Walter Schumann, Gemstones of the world (2001)
More from other references
HabitPseudo-cubic
Arthur Thomas, Gemstones (2009)
Geological Environment
Where found:Occurs as a secondary mineral formed by the reaction of chloride with primary sulphides in the oxidized zone of lead–copper deposits.
Michael O’Donoghue, Gems, Sixth Edition (2006)
Further Information
Mineral information:Boleite information at mindat.org
Significant Gem Localities
Mexico
 
  • Baja California Sur (BC Sur)
    • Mun. de Mulegé
      • Santa Rosalía
        • Boleo District
          • Arroyo de la Soledad
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 391
Copyright © Jolyon & Katya Ralph 1993-2018. 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.