Mineral Information and Data:

Ajoite
Na3Cu2+20Al3Si29O76(OH)16 • 8H2O [CNMNC approved formula]

Named for the locality: New Cornelia mine, Ajo, Pima County,, Arizona, USA.

IMA status : Valid species (Pre-IMA 1958) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
78.05.01.01  
  (78) Unclassified silicates
  (78.05) possible phyllosilicates
  (78.05.01)
  
Nickel-Strunz
(10th edition) :
09.EA.70
  (09) Silicates
  (09.E) Phyllosilicates
  (09.EA) Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
  
Crystal system: Triclinic System
Point group (H-M): 1 — pinacoidal
Unit cell: a = 13.66 Å, b = 14.51 Å, c = 13.62 Å, a = 107.2°, b = 105.5°, g = 110.6°
Crystal Habit: Crystals platy or lath-like, tiny; usually massive
  
Color: Bluish-green
Diaphaneity: Translucent
Luster: Vitreous
Measured Density: 2.96 g/cm3
Cleavage: 1; {010} perfect
Streak: Greenish white
  
Geologic Setting: In oxidized copper-rich base-metal deposits.
Mineral Association: Shattuckite, conichalcite, quartz, muscovite, pyrite (Ajo, Arizona, USA); creaseyite, fluorite (Potter-Cramer property, Arizona, USA); shattuckite, duhamelite, sillenite (Munihuaza, Mexico); quartz, papagoite (Messina, South Africa).
  
Other Properties: Gemstone Unlikely Available.

 

Ajoite
Origin: New Cornelia mine, Pima Co., Arizona, United States (type locality)
Sample size: 4.5 x 4.5 x 3 cm
Photo: Tom Loomis

 

Ajoite
(zoom-in of above)

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