Mineral Guide · Mineral
Evansite is a hydrated aluminium phosphate that forms amorphous botryoidal crusts and coatings, often with pale green, yellow or blue colour.
Evansite is a hydrated aluminium phosphate that forms amorphous botryoidal crusts and coatings, often with pale green, yellow or blue colour.
Reference formula: Al3(PO4)2(OH)3·nH2O. Evansite is commonly amorphous or poorly crystalline and has variable water content. It therefore has no single verified lattice to render as a species structure; the guide intentionally leaves the 3D structure empty.
Typical colours include colourless, white, yellow, blue-green. The usual botryoidal, crusty, massive habit and vitreous, waxy, dull lustre are useful descriptive features, but colour alone is not diagnostic.
Evansite forms in or is associated with weathering and oxidation of phosphate-bearing rocks and ore deposits. Important documented localities include the Czech Republic, Slovakia, Hungary, Germany, Australia and the United States.
Very delicate; protect from drying, impact and abrasion, and do not market colour or symbolism as a diagnostic property.
Modern crystal guides sometimes associate Evansite with symbolic themes based on colour or collecting tradition. These associations are cultural interpretations, not mineralogical or medical properties.
Reviewed by NotOnlyRocks Editorial Team
Last reviewed: 25 August 2026
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