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Formula: Cu6Al(SO4)(OH)12Cl.3H2O
Hydrated sulphate containing hydroxyl and halogen
Crystal System: Trigonal
Specific gravity: 3.135 to 3.141 measured, 3.14 calculated
Hardness: 2 or 3 depending on face
Streak: Pale green
Colour: Dark green, bluish green, emerald green
Solubility: Insoluble in water. Readily soluble in acids.
Environments:
Spangolite is a rare secondary mineral commonly occurring with other secondary
copper minerals in
oxidised zones of copper-bearing ore bodies (Mindat, Webmin, HOM), associated with
cuprite, connellite,
brochantite, chalcophyllite,
cyanotrichite, linarite,
caledonite, clinoclase,
azurite, malachite,
aurichalcite, tenorite and
chrysocolla
(HOM, AM78.649-652).
Localities
At Broken Hill, New South Wales, Australia, a specimen of spangolite has been found as a coating on
cerussite
(AJM 3.1.45).
At the Mount Isa Block, Queensland, Australia, spangolite has been found on a fracture surface in
chert, associated with
chrysocolla
(AJM 17.2.86).
At the type locality, Bisbee, Arizona, USA, spangolite is associated with cuprite
nodules, and it has
also been found with claringbullite and atacamite
(Minrec 43.1 supplement, R&M 87.1.18).
Spangolite from Bisbee - Image
At the Tintic Mining District, Utah, USA, spangolite is a rare mineral, but the Grand Central and Mammoth mines
have yielded specimens. In addition, blue hexagonal spangolite crystals to nearly 1 mm wide have been found on
the dumps of the Centennial Eureka mine
(MinRec 55.2.223).
Spangolite from Tintic - Image
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