mineral

Milky Quartz or Calcite Pebble

Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3)

AI-generated identification · may be incorrect

Hardness: 7 (Quartz) or 3 (Calcite); Color: Tan, beige, or milky white; Luster: Vitreous to waxy; Structure: Hexagonal or Trigonal; Opaque to translucent appearance with rounded edges.

Hardness: 7 (Quartz) or 3 (Calcite)
Color: Tan, beige, or milky white
Luster: Vitreous to waxy

Identified July 3, 2026More mineral →

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Physical properties

Hardness: 7 (Quartz) or 3 (Calcite); Color: Tan, beige, or milky white; Luster: Vitreous to waxy; Structure: Hexagonal or Trigonal; Opaque to translucent appearance with rounded edges.

Formation & geological history

Forms in hydrothermal veins, as precipitates from mineral-rich fluids, or as a byproduct of metamorphic processes. This specific specimen has been significantly water-worn or tumbled by environmental erosion.

Uses & applications

Commonly used as decorative landscape stone, in gravel, or as a basic collector's specimen. Quartz is used in electronics and glass-making.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. If this specimen is Calcite, it will bubble when in contact with weak acid (like vinegar).

Field identification & locations

Found globally in riverbeds, beaches, and glacial deposits. Identify by performing a hardness test: if it scratches glass, it is quartz; if it can be scratched by a penny, it is calcite.