metamorphic
Red aventurine
Silicon Dioxide (SiO2) with Hematite or Goethite inclusions
Hardness: 6.5-7 (Mohs scale), Color: Reddish-brown to orange-red, Luster: Vitreous to waxy with aventurescence, Crystal Structure: Trigonal (Microcrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.64-2.69
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Reddish-brown to orange-red, Luster: Vitreous to waxy with aventurescence, Crystal Structure: Trigonal (Microcrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.64-2.69
Formation & geological history
Formed through the regional metamorphism of sandstone into quartzite. The red color and shimmering effect are caused by heavy concentrations of tiny platy inclusions of hematite or goethite during metamorphic recrystallization.
Uses & applications
Primary use is in jewelry (beads, cabochons), ornamental carvings, tumbled stones for collectors, and as a 'healing stone' in metaphysical practices.
Geological facts
The optical phenomenon 'aventurescence' refers to the glittering effect caused by light reflecting off tiny mineral inclusions. It was named after a type of Italian glass ('a ventura') that accidentally contained copper filings.
Field identification & locations
Identify in the field by its hardness (scratches glass), lack of cleavage, and the characteristic sparkling effect within the stone. Commonly found in large deposits in Brazil and India.
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