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Ajoite

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Ajoite
Ajoite is a hydrated sodium potassium copper aluminium silicate hydroxide mineral. Ajoite has the chemical formula (Na,K)Cu7AlSi9O24(OH)6·3(H2O), and minor MnFe and Ca are usually also present in the structure. Ajoite is used as a minor ore of copper.

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Mineralogy Database Dictionary

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Ajoite

General Information:
 Chemical Formula:
(K,Na)Cu7AlSi9O24(OH)6·3(H2O)
 Composition:
(Molecular Weight = 1,302.14 gm)
Potassium 2.70 % 
Sodium 0.18 % Na
Aluminum 2.07 % Al
Silicon 19.41 % Si
Copper 34.16 % Cu
Hydrogen 0.93 % 
Oxygen 40.55 % 
 Empirical Formula:
K0.9Na0.1Cu7AlSi9O24(OH)6·3(H2O)
 Environment:
Secondary copper mineral.
 Locality:
New Cornelia mine, Ajo, Pima County,, Arizona, USA.
 Name Origin:
Named for the locality.
Physical Properties:
 Cleavage:
[010] Perfect
 Color:
blue green.
 Density:
2.96
 Diaphaniety:
Translucent
 Habits:
Massive - Uniformly indistinguishable crystals forming large masses., Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape., Platy - Sheet forms (e.g. micas).
 Luster:
Vitreous (Glassy)
 Streak:
greenish white
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