Banded Calcite (Tumbled)

Physical Properties

Hardness: 3 on Mohs scale; Color: Cream, white, and pale blue/green banding; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: Perfect rhombohedral; Specific Gravity: 2.71

Formation & Geological History

Formed through chemical precipitation in various geological environments, often in caves or spring deposits (travertine) or hydrothermal veins. Age varies by deposit, typically Tertiary or older.

Uses & Applications

Used primarily for ornamental items, decorative carvings, tumbling for gemstone collectors, and as a focus for metaphysical practitioners.

Geological Facts

Calcite is one of the most common minerals on Earth and is the primary component of limestone and marble. It exhibits double refraction (birefringence) when clear.

Field Identification & Locations

Identify in the field by its distinctive soft hardness (can be scratched by a copper coin) and its effervescence (bubbling) when in contact with weak hydrochloric acid or vinegar. Often found in limestone-rich regions.

Identified on: 4/26/2026

Mode: Standard