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Mineralpedia Details for Gilalite

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Gilalite

Gilalite

Named for the type locality in the Christmas mine in Gila County, Arizona in the United States. Gilalite is a rare mineral that can only be found in Arizona and Nevada in the USA, in Greece at Laurion, and in Brazil. At its type locality, Gilalite is “a retrograde metamorphic or megogene mineral formed at the expense of a prograde calc-silicate and sulfide assemblage, in tactites commonly incrusting fractures, [and] also filling cracks or interstices in diopside grains.”

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/gilalite.pdf

Formula
Cu5Si6O17ยท7H2
Crystal System
Monoclinic 
Crystal Habit
Spherical, Radial, Fibrous 
Color
blue green, green 
Streak
light green 
Class
Monoclinic 
Hardness
WebMineral
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Mindat
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Gilalite from Christmas mine, Gila Co., Arizona, United States

Gilalite
            from Christmas mine, Gila Co., Arizona, United States

Light green spheroidal crystals to about 0.75mm.

Dozens of pastel green, smooth bead-like crystals to about 0.75mm. 

Green spherical crystals to 0.3mm in bunches with Stringhamite.

Click thumbnail images for larger view.

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