Sand Grain (Silica/Quartz Grain)

Physical Properties

Hardness: 7 on Mohs scale; Color: Brownish-grey/translucent; Luster: Vitreous to dull; Structure: Hexagonal (trigonal); Cleavage: None; Specific Gravity: 2.65

Formation & Geological History

Formed through the mechanical and chemical weathering of pre-existing igneous or metamorphic rocks (like granite). This specific grain appears to be a clastic sedimentary particle weathered over thousands of years.

Uses & Applications

Construction (concrete/mortar), glass manufacturing, hydraulic fracturing, and as an abrasive in industrial sandblasting.

Geological Facts

Quartz is one of the most abundant minerals in Earth's crust. Most 'sand' is actually broken down quartz because it is chemically stable and physically hard enough to resist erosion longer than other minerals.

Field Identification & Locations

Identify by its ability to scratch glass and lack of reaction to acid. In the field, microscopic examination of grain roundness can tell a geologist how far the sediment traveled from its source.

Identified on: 5/7/2026

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