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Adamite is a zinc arsenate hydroxide mineral. It is a mineral that typically occurs in the oxidized or weathered zone above zinc ore occurrences. Adamite is usually yellow in color, but tints of green occur due to inclusion of copper substitutions in the mineral structure. Olivinite is a copper arsenate that is isostructural with adamite and there is considerable substitution between zinc and copper resulting in an intermediate called cuproadamite.
Zn2 As O4 (OH) - Zinc Arsenate Hydroxide
Class:
Subclass:
Yellow-green, yellow, green, colorless, purple
White
Vitreous
Transparent to translucent
4.4
3.5
Imperfect
Conchoidal to uneven
Long to short prismatic and dipyamidal cyrstals, acicular and radial aggregates, massive
Yellow - green
Frequency:
Uncommon
Origin:
Secondary in Zn deposits, associated with hemimorphite, goethitee and smithsonite. Rich druses of green and rare purple crystals upt to 2-1/4 inches (70mm) across.
Occurence:
Mina Ojuela, Mapimi, Durango, Mexico; Tsumeb, Namibia; Laurion, Greece, and Cap Garonne, France.
Application:
Mineral specimens

 
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