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Mineralpedia Details for Utahite

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Utahite

Utahite

Named for the state of Utah, USA where the mineral was discovered at its type locality, the Centennial Eureka mine. Utahite can be found only in the United States in the mine dumps as a rare secondary mineral from the oxidized zone of Cu-Zn-Te bearing hydrothermal deposits. Utahite has also been found at the Empire mine in Arizona, USA.

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

Formula
Cu5Zn3(TeO4)4(OH)8ยท7H2
Crystal System
Triclinic 
Crystal Habit
Aggregates, Prismatic 
Cleavage
None, None, None 
Luster
Vitreous - Adamantine 
Color
pale blue, greenish blue 
Streak
pale blue 
Class
Triclinic 
Fracture
Brittle - Uneven 
Hardness
4-5 
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Utahite from Centennial Eureka mine, Tintic dist., Juab Co., Utah, United States

Utahite
            from Centennial Eureka mine, Tintic dist.,  Juab Co., Utah, United States

Tiny bladed blue crystal groups to 0.3mm with an unknown lime spheroidal mineral.

Type Specimen. Platy single crystals to about 0.75mm.

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