metamorphic
Green Aventurine (Tumbled Quartz)
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)3Si3O10(OH)2)
Hardness: 7 (Mohs scale), Color: Pale to dark green with visible shimmer (aventurescence), Luster: Vitreous to waxy, Crystal Structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.63 - 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: Pale to dark green with visible shimmer (aventurescence), Luster: Vitreous to waxy, Crystal Structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.63 - 2.65
Formation & geological history
Formed through regional metamorphism in schist and quartzite formations; the green color and shimmer are created by platy inclusions of green chromium-rich mica (fuchsite) trapped within the quartz as it crystallizes.
Uses & applications
Commonly used for tumbled stones, beads, jewelry, ornamental carvings, desk accessories, and as a popular specimen for crystal collecting and metaphysical purposes.
Geological facts
The name 'Aventurine' comes from the Italian 'a ventura,' meaning 'by chance,' originally referring to 'aventurine glass' (goldstone) which was discovered accidentally before the mineral was named for its resemblance.
Field identification & locations
Identify in the field by its hardness (scratches glass) and its signature 'aventurescence' (glistening tiny flakes). Frequently found in India, Brazil, Russia, and Tanzania. For collectors, look for deep green color and consistent 'sparkle'.
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