sedimentary
Sand Grain (Quartz)
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale); Color: Tan/Light Brown; Luster: Vitreous to dull; Crystal structure: Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65
- Hardness
- 7 (Mohs scale)
- Color
- Tan/Light Brown
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 (Mohs scale); Color: Tan/Light Brown; Luster: Vitreous to dull; Crystal structure: Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65
Formation & geological history
Formed through the weathering and erosion of pre-existing igneous rocks like granite. This specimen was likely transported by water or wind, leading to its rounded shape and small size.
Uses & applications
In bulk, it is used in glass manufacturing, concrete construction, and filtration systems. Individually, it is a subject for micro-mineralogy.
Geological facts
Quartz sand is one of the most common materials on Earth's surface. A single grain can be millions of years old, having survived multiple cycles of erosion and deposition.
Field identification & locations
Identify by its hardness (scratches glass) and lack of reaction to acid. Commonly found on beaches, riverbeds, and in deserts worldwide.
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