metamorphic
Orange Quartzite (or Aventurine Quartz)
Quartzite (primarily SiO2 with Hematite or Goethite inclusions)
Hardness: 7 (Mohs scale); Color: Pale orange to peach; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal (granular microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.63 - 2.65
- Hardness
- 7 (Mohs scale)
- Color
- Pale orange to peach
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 (Mohs scale); Color: Pale orange to peach; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal (granular microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.63 - 2.65
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone. Under intense heat and pressure, the sand grains recrystallize into a dense, interlocking mosaic of quartz crystals. The orange tint is typically caused by minute inclusions of iron oxides like hematite.
Uses & applications
Used widely as decorative stone in landscaping, aquarium gravel, as a semi-precious gemstone for tumbled 'healing stones', and occasionally for jewelry beads. In larger scale, it is used for road ballast and building facades.
Geological facts
Quartzite is so durable that it often survives intense weathering better than the surrounding rock. This specific specimen appears water-worn or tumbled, suggesting it may have been smoothed by river processes or commercial tumbling.
Field identification & locations
Identify in the field by its inability to be scratched by a steel knife and its grainy, 'sugary' texture when freshly broken. Found globally in mountainous regions where tectonic activity has occurred. Collectors should look for pieces with 'aventurescence' (internal shimmers).
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