Yellow Calcite

Hardness: 3 (Mohs scale), Color: Pale yellow to golden, Luster: Vitreous to waxy, Crystal Structure: Trigonal, Cleavage: Perfect rhombohedral

Formed in sedimentary environments through chemical precipitation or as a primary mineral in igneous and metamorphic rocks, often found in hydrothermal veins.

Used primarily for ornamental purposes, tumbled stones, meditation, and as a source of calcium in industrial chemical manufacturing.

Calcite is one of the most common minerals on Earth, but yellow varieties get their color from small amounts of iron impurities. It exhibits double refraction when in clear, rhombohedral forms.

Can be identified by its relative softness (scratched by a copper coin) and its effervescence (bubbles) when meeting a drop of weak acid such as vinegar. Look for a waxy feel in tumbled specimens.