Blue Calcite

Physical Properties

Hardness: 3 on Mohs scale. Color: Pale blue to sky blue. Luster: Vitreous to waxy. Crystal system: Trigonal/Rhombohedral. Cleavage: Perfect rhombohedral in three directions. Specific Gravity: 2.71.

Formation & Geological History

Formed in sedimentary environments through chemical precipitation or by the accumulation of shell, coral, and algal debris. It can also form in hydrothermal veins or as a secondary mineral in igneous and metamorphic rocks.

Uses & Applications

Mostly used for ornamental purposes, decorative carvings, lapidary work, and as a popular specimen for mineral collectors and metaphysical practitioners.

Geological Facts

Calcite is one of the most common minerals on Earth. The blue variety specifically gets its color from light-dispersing inclusions or natural irradiation. It can produce a double refraction effect known as 'Iceland Spar' in clear specimens.

Field Identification & Locations

Identify by its light blue color, waxy feel, and rhombohedral cleavage planes. It will vigorously effervesce (fizz) when exposed to a drop of dilute hydrochloric acid. Commonly found in Mexico, South Africa, and Madagascar.

Identified on: 4/23/2026

Mode: Standard