metamorphic
Orange Quartzite / Aventurine
Silicon Dioxide (SiO2)
Hardness: 7 on the Mohs scale. Color: Orange to peach due to hematite or goethite inclusions. Luster: Vitreous to waxy. Crystal structure: Trigonal/Hexagonal. Cleavage: None (conchoidal fracture). Specific gravity: 2.6 to 2.7.
- Hardness
- 7 on the Mohs scale
- Color
- Orange to peach due to hematite or goethite inclusions
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 on the Mohs scale. Color: Orange to peach due to hematite or goethite inclusions. Luster: Vitreous to waxy. Crystal structure: Trigonal/Hexagonal. Cleavage: None (conchoidal fracture). Specific gravity: 2.6 to 2.7.
Formation & geological history
Formed through the metamorphism of quartz sandstone under high heat and pressure, causing the original quartz grains to recrystallize. The orange color comes from mineral impurities trapped during this process.
Uses & applications
Used primarily for decorative purposes, landscape architecture, jewelry (beads and cabochons), and as a collector's specimen. In larger quantities, it can be used for flooring and counter tops.
Geological facts
Quartzite is stronger and more durable than the parent sandstone. The 'glittery' effect often seen in similar stones is called aventurescence, which is caused by platy mineral inclusions.
Field identification & locations
Identify in the field by its hardness (it will easily scratch glass) and its grainy, sugary texture that differs from the smooth look of carnelian. Commonly found in areas of historical plate tectonic activity such as Brazil, India, and parts of the USA.
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