Variscite
Image: Robert M. Lavinsky (CC BY-SA 3.0)
Mineral NameVariscite
Chemical FormulaAlPO₄·2H₂O
Mohs Hardness4
Crystal Systemorthorhombic
Lustervitreous
Streak Colorwhite
Cleavagegood on {010}, poor on {100} and {110}, but rarely observed in massive forms
Fractureconchoidal
Specific Gravity2.5
Colorsgreen, apple-green, emerald-green, yellowish-green
Transparencytranslucent
Type LocalityUtahlite claim (Lucin Variscite), Lucin, Lucin District, Pilot Range, Box Elder County, Utah
Mineral GroupPhosphates
Usesjewelry, ornamental stone, collector
Associated Mineralscrandallite, wardite, strengite, wavellite, chalcedony
Rarityuncommon
Description
This specimen is a vibrant apple-green to emerald-green massive aggregate of Variscite, exhibiting a somewhat waxy luster. It features irregular brownish and lighter green matrix or veining throughout its surface.
Geological Context
Variscite is a secondary mineral that forms in aluminum-rich rocks through the action of phosphate-bearing waters, typically in near-surface environments. It often occurs as nodular masses, crusts, or vein fillings in brecciated chert or shale.
