metamorphic
Orange Quartzite (Tumbled)
Quartzite (SiO2)
Hardness: 7 on Mohs scale. Color: Orange to reddish-orange due to iron inclusions. Luster: Vitreous to waxy. Crystal Structure: Hexagonal (microcrystalline). Cleavage: None, exhibits conchoidal fracture. Specific Gravity: 2.6 - 2.7.
- Hardness
- 7 on Mohs scale
- Color
- Orange to reddish-orange due to iron inclusions
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale. Color: Orange to reddish-orange due to iron inclusions. Luster: Vitreous to waxy. Crystal Structure: Hexagonal (microcrystalline). Cleavage: None, exhibits conchoidal fracture. Specific Gravity: 2.6 - 2.7.
Formation & geological history
Formed through the regional metamorphism of quartz-rich sandstone. High heat and pressure cause quartz grains to recrystallize and fuse together, obliterating the original sedimentary texture and pores. This piece appears water-worn or tumbled.
Uses & applications
Commonly used as decorative landscape stone, in aquarium decor, or as crushed aggregate for construction. High-quality pieces are used in lapidary work for cabochons and tumbled stones.
Geological facts
Quartzite is so durable that it often outlasts the mountain ranges from which it originated, frequently found as pebbles in riverbeds far from its source. It is harder and more resistant to weathering than its parent rock, sandstone.
Field identification & locations
Identify in the field by its inability to be scratched by a steel knife and its lack of visible grains (unlike sandstone). Commonly found in ancient mountain belts or riverbeds drains. This specific specimen is a small, polished pebble likely from a decorative mix or river wash.
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