mineral
Quartz (Microcrystalline/Agate)
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: Tan, beige, translucent white; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65
- Hardness
- 7 on Mohs scale
- Color
- Tan, beige, translucent white
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale; Color: Tan, beige, translucent white; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65
Formation & geological history
Formed from silica-rich hydrothermal fluids or as precipitates in sedimentary rock cavities. This specimen shows signs of water-tumbled erosion, typical of river or beach cobbles found in various geological ages.
Uses & applications
Used in glassmaking, electronics (piezoelectric properties), abrasives, and as semi-precious gemstones in jewelry or for metaphysical collecting.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. This specific piece appears to be a small agate or chalcedony nodule, which are often the remains of volcanic gas bubbles filled with silica over millions of years.
Field identification & locations
Identify by its hardness (it will scratch glass) and lack of cleavage planes. Commonly found in gravel pits, riverbeds, and desert washes globally. Collectors often look for translucency when held to light.
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