metamorphic
Red aventurine
Silicon Dioxide (SiO2) with Hematite/Goethite inclusions
Hardness: 7 Mohs; Color: Orange-red to brownish-red; Luster: Vitreous to waxy; Crystal structure: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.64-2.69
- Hardness
- 7 Mohs
- Color
- Orange-red to brownish-red
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 Mohs; Color: Orange-red to brownish-red; Luster: Vitreous to waxy; Crystal structure: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.64-2.69
Formation & geological history
Formed through the metamorphism of quartz-rich sedimentary rocks (sandstone) where iron oxide minerals like hematite or goethite are trapped during recrystallization, creating a spangled effect known as aventurescence.
Uses & applications
Primarily used for lapidary work, including carvings (as seen here), cabochons for jewelry, decorative figurines, and as a 'healing stone' in metaphysical communities.
Geological facts
The name 'aventurine' comes from the Italian 'a ventura,' meaning 'by chance.' This refers to the accidental discovery of 'aventurine glass' in the 18th century, which looks similar to this natural stone.
Field identification & locations
Collectors identify it by its 'aventurescence' (internal shimmers) and its quartz-like hardness. To differentiate from red jasper, look for its translucency; aventurine is often slightly translucent whereas jasper is opaque.
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