Rock Identifier
Green Aventurine (Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)) — mineral
mineral

Green Aventurine

Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Hardness: 7 on Mohs scale; Color: Pale to dark green; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific gravity: 2.64-2.69. It displays a characteristic shimmering effect called aventurescence.

Hardness
7 on Mohs scale
Color
Pale to dark green
Luster
Vitreous to waxy
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Physical properties

Hardness: 7 on Mohs scale; Color: Pale to dark green; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific gravity: 2.64-2.69. It displays a characteristic shimmering effect called aventurescence.

Formation & geological history

Formed in magmatic and metamorphic environments where quartz-rich deposits undergo high pressure or heat, allowing mica inclusions (usually Fuchsite) to form within the quartz structure. Most deposits are millions of years old.

Uses & applications

Primarily used in jewelry (beads, cabochons), ornamental carvings, and as a popular stone for collectors and metaphysical practitioners. Occasionally used in interior decor like mosaics.

Geological facts

The name 'Aventurine' comes from the Italian 'a ventura', meaning 'by chance', originally referring to accidental aventurine glass production in the 18th century. It is known as the 'Stone of Opportunity' in folklore.

Field identification & locations

Identify by its 'shimmer' or 'glitter' (aventurescence) caused by mica flakes. It is a common find in river beds or quarries in regions like India, Brazil, and Russia. Collectors should look for a uniform green color and strong sparkling effect.

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