White Calcite

Physical Properties

Hardness: 3 on Mohs scale (can be scratched by a copper coin); Color: White to colorless; Luster: Vitreous to pearly; Crystal structure: Trigonal/Hexagonal; Cleavage: Perfect rhombohedral in three directions; Specific gravity: 2.71.

Formation & Geological History

Formed through sedimentary processes like chemical precipitation in marine environments, or as a primary mineral in igneous and metamorphic rocks (such as marble). It is one of the most common minerals on Earth's crust.

Uses & Applications

Used in the manufacturing of cement and mortar, as a soil conditioner in agriculture, a pigment in paint, and for pharmaceutical purposes (antacids). Tumbled stones are popular in the metaphysical and jewelry trade.

Geological Facts

Calcite exhibits double refraction; if you place a clear crystal over a line, it will appear as two lines. It is the primary component of limestone and marble.

Field Identification & Locations

Identify in the field using the 'acid test'—it will effervesce (fizz) vigorously when touched with dilute hydrochloric acid or strong vinegar. It is very soft compared to quartz.

Identified on: 4/22/2026

Mode: Standard