metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite
Hardness: 7 (Mohs scale), Color: Pale to deep green with white clouding, Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline), Cleavage: None, Specific Gravity: 2.64-2.69
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Physical properties
Hardness: 7 (Mohs scale), Color: Pale to deep green with white clouding, Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline), Cleavage: None, Specific Gravity: 2.64-2.69
Formation & geological history
Formed through the regional metamorphism of sandstone into quartzite, where mica crystals (fuchsite) are trapped within the quartz matrix. Most deposits are found in Precambrian rock formations.
Uses & applications
Primarily used for lapidary work, jewelry, ornamental carvings (like the heart shown), and as a popular 'healing' crystal in metaphysical practices.
Geological facts
The name Aventurine comes from the Italian 'a ventura', meaning 'by chance', originally referring to the accidental discovery of aventuras glass in the 18th century. It is known for its 'aventurescence,' a shimmering effect caused by platy mineral inclusions.
Field identification & locations
Identify by its characteristic green color and shimmering inclusions. It is commonly found in India, Brazil, Russia, and Madagascar. Collectors look for evenness of color and the intensity of the sparkling effect.
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