Shattuckite from the type locality in Bisbee. Size: 6.0×4.9×2.9 cm.
|Color||Dark and light blue, turquoise|
|Crystal habit||Commonly spherulitic aggregates of acicular crystals|
|Cleavage||perfect along  and |
|Mohs scale hardness||3.5|
|Luster||Dull to silky|
|Diaphaneity||Translucent to opaque|
|Specific gravity||4.1 (rather heavy for a non-metallic mineral)|
|Optical properties||Biaxial (+)|
|Refractive index||nα = 1.753, nβ = 1.782, nγ = 1.815|
|Pleochroism||X = very pale blue; Y = pale blue; Z = deep blue|
Shattuckite is a copper silicate hydroxide mineral with formula Cu5(SiO3)4(OH)2. It crystallizes in the orthorhombic – dipyramidal crystal system and usually occurs in a granular massive form and also as fibrous acicular crystals. It is closely allied to plancheite in structure and appearance.
Shattuckite is a relatively rare copper silicate mineral. It was first discovered in 1915 in the copper mines of Bisbee, Arizona, specifically the Shattuck Mine (hence the name). It is a secondary mineral that forms from the alteration of other secondary minerals. At the Shattuck Mine, it forms pseudomorphs after malachite. A pseudomorph is an atom by atom replacement of a crystal structure by another crystal structure, but with little alteration of the outward shape of the original crystal.
Shattuckite with malachite, about 4 cm wide. Kaokoveld Mine, Namibia
Polished shattuckite with malachite, New Cornelia mine, Ajo, Arizona. Size 5.3×5.1×5.0 cm
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