metamorphic
Green Aventurine (Green Quartzite)
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
Hardness: 7 (Mohs scale), Color: Forest green to sea green, Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.64-2.69
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Physical properties
Hardness: 7 (Mohs scale), Color: Forest green to sea green, Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.64-2.69
Formation & geological history
Formed as a metamorphic rock (quartzite) when quartz-rich sedimentary rocks are subjected to high heat and pressure. The characteristic green color comes from tiny platelets of chrome-rich fuchsite mica trapped within the quartz matrix during metamorphism.
Uses & applications
Used widely in lapidary work for cabochons, beads, and carvings. Also popular in construction for ornamental landscaping stones and as a decorative architectural finish.
Geological facts
Aventurine is known for 'aventurescence,' a shimmering effect caused by light reflecting off tiny mineral inclusions. While green is the most common color, it can also be found in blue, orange, and red depending on the secondary minerals present.
Field identification & locations
Identify in the field by its hardness (will scratch glass), green color, and subtle internal shimmer. Commonly found in India, Brazil, Russia, and Tanzania. Collectors look for uniform color and strong shimmering effect.
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