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Mineralpedia Details for Chalcophyllite

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Chalcophyllite

Chalcophyllite

Named from the Greek words chalkos, meaning “copper,” and phyllo, meaning “leaf,” in reference to the minerals copper content as well as its platy, leaf-like habit. Chalcophyllite is an uncommon mineral that occurs as a secondary mineral in oxidized arsenic-bearing hydrothermal, polymetallic deposits. Localities for Chalcophyllite include in Germany, Austria, Russia, England, France, the United States, Chile, and New Zealand as well as other more minor localities.

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

Formula
Cu18Al2(AsO4)4(SO4)3(OH)24·36H2
Crystal System
Trigonal 
Crystal Habit
Platy, Tabular, Massive - Lamellar 
Cleavage
Perfect, None, None 
Luster
Vitreous - Pearly 
Color
emerald green, bluish green, grass green 
Streak
pale green 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Uneven 
Hardness
WebMineral
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Mindat
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Chalcophyllite from Majuba Hill mine, Pershing Co., Nevada, United States

Chalcophyllite
            from Majuba Hill mine, Pershing Co., Nevada, United States

Thick tabular hexagonal crystals to 2.5mm.

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Chalcophyllite from Wheal Gorland, St. Day dist., Cornwall, England

Chalcophyllite
            from Wheal Gorland, St. Day dist., Cornwall, England

Green platy crystals with hexagonal outlnes to 8mm across.

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Chalcophyllite from Piesky, Špania Dolina, Banská Bystrica, Slovakia

Chalcophyllite
            from Piesky, Špania Dolina, Banská Bystrica, Slovakia

This tabular hexagonal plates of Chalcophyllite with liberal coverage. Nice representative specimen from this classic arsenate locality of Europe.

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Chalcophyllite from Špania Dolina, Stare Hory near Banská Bystrica, Slovakia

Chalcophyllite
            from Špania Dolina, Stare Hory near  Banská Bystrica, Slovakia

Excellent, well-formed, hexagonal platy crystals to 1mm throughout Azurite matrix.

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Chalcophyllite from Gwennap, Cornwall, England

Chalcophyllite
            from Gwennap, Cornwall, England

Pastel green, thin tabular crystals to 6mm.

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Chalcophyllite from Chuquicamata mine, El Loa Prov., Antofagasta, Chile

Chalcophyllite
            from Chuquicamata mine, El Loa Prov., Antofagasta, Chile

Attractive uncommon copper arseate, Chalcophyllite, with distinct crystals to about 0.5mm across the face.

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