Papagoite

Papagoite is named after the Papago, the early inhabitants of the area around Ajo, Pima County, Arizona, USA, the discovery locality.

Papagoite forms crystalline coatings and aggregates of cerulean blue colour. Crystals are often too small to be fashioned.
General Information
Chemical Formula
CaCuAlSi
 
2
O
 
6
(OH)
 
3
Michael O’Donoghue, Gems, Sixth Edition (2006)
Photos of natural/un-cut material from mindat.org
Physical Properties of Papagoite
Mohs Hardness5 to 5.5
Michael O’Donoghue, Gems, Sixth Edition (2006)
Specific Gravity3.25
Michael O’Donoghue, Gems, Sixth Edition (2006)
Cleavage QualityDistinct
Anthony et al, Handbook of Mineralogy (2001) Noted in thin section
Optical Properties of Papagoite
Refractive Index1.607 to 1.672
Michael O’Donoghue, Gems, Sixth Edition (2006) RI for the alpha, beta and gamma rays is 1.607, 1.641 and 1.672
Optical CharacterBiaxial/-
Michael O’Donoghue, Gems, Sixth Edition (2006)
Birefringence0.065
Michael O’Donoghue, Gems, Sixth Edition (2006)
PleochroismColorless to very pale greenish blue - blue - deep greenish blue.
Anthony et al, Handbook of Mineralogy (2001)
DispersionVery faint
Anthony et al, Handbook of Mineralogy (2001)
Colour
Colour (General)Cerulean blue
Michael O’Donoghue, Gems, Sixth Edition (2006)
TransparencyTransparent,Translucent
Anthony et al, Handbook of Mineralogy (2001)
LustreVitreous
Anthony et al, Handbook of Mineralogy (2001)
Crystallography of Papagoite
Crystal SystemMonoclinic
Michael O’Donoghue, Gems, Sixth Edition (2006)
HabitCrystalline coatings and aggregates
Michael O’Donoghue, Gems, Sixth Edition (2006)
More from other references
Geological Environment
Where found:Papagoite is often mixed with quartz and occurs in narrow veinlets in altered granodiorite porphyry
Michael O’Donoghue, Gems, Sixth Edition (2006)
More from other references
Further Information
Mineral information:Papagoite information at mindat.org
Significant Gem Localities
USA
 
  • Arizona
    • Pima Co.
      • Ajo Mining District
        • Little Ajo Mts
          • Ajo
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 434
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