Shattuckite

Shattuckite is named after its discovery locality, at the Shattuck Arizona Copper Company mine, Bisbee, Coshise County, Arizona, USA.

Shattuckite forms translucent orthorhombic deep to medium aggregates of spherulitic blue masses. The material has strong pleochroism ranging from pale to deep blue.

Shattuckite has nice blue colour and takes a good polish. It yields attractive cabochons and carvings.
General Information
Chemical Formula
Cu
 
5
(SiO
 
3
)
 
4
(OH)
 
2
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Photos of natural/un-cut material from mindat.org
Physical Properties of Shattuckite
Mohs Hardness3.5 to 4
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Specific Gravity3.80 to 4.15
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Cleavage QualityPerfect
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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FractureUneven
Arthur Thomas, Gemstones (2009)
Optical Properties of Shattuckite
Refractive Index1.752 to 1.815
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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Optical CharacterBiaxial/-
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Birefringence0.063
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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PleochroismPleochroism is strong ranging from very pale to deep blue.
Michael O’Donoghue, Gems, Sixth Edition (2006)
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DispersionDistinct to strong
Arthur Thomas, Gemstones (2009)
Colour
Colour (General)Blue
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Causes of ColourBlue, Cu2+
W. William Hanneman, Pragmatic Spectroscopy For Gemologists (2011)
TransparencyTranslucent,Opaque
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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LustreVitreous,Silky
Arthur Thomas, Gemstones (2009)
Crystallography of Shattuckite
Crystal SystemOrthorhombic
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
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HabitSpherulitic masses
Michael O’Donoghue, Gems, Sixth Edition (2006)
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Geological Environment
Where found:Shattuckite occurs as a secondary mineral in oxidized copper deposits.
Michael O’Donoghue, Gems, Sixth Edition (2006)
Further Information
Mineral information:Shattuckite information at mindat.org
Significant Gem Localities
USA
 
  • Arizona
    • Cochise Co.
      • Mule Mts
        • Warren Mining District
          • Bisbee
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 450
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