Mineral

Yellow Calcite

Calcium Carbonate (CaCO3)

Hardness: 3 on Mohs scale; Color: Pale yellow to lemon yellow; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: Perfect rhombohedral in three directions; Specific Gravity: 2.71.

Hardness: 3 on Mohs scale
Color: Pale yellow to lemon yellow
Luster: Vitreous to waxy

Identified March 8, 2026More mineral →

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Physical properties

Formation & geological history

Formed through sedimentary processes, often precipitated from marine environments or within hydrothermal veins. It is found in a wide variety of geological ages, commonly in limestone and marble deposits.

Uses & applications

Used primarily for decorative purposes, lapidary carvings, tumbled stones for collectors, and in the metaphysical community. In industry, calcite is used in cement, antacids, and as a soil conditioner.

Geological facts

Yellow calcite is known for its double refraction (birefringence), where light passing through a clear crystal splits into two rays. It is also highly reactive to dilute hydrochloric acid, which causes it to fizz (effervesce).

Field identification & locations

Identify in the field by its 3-way rhombohedral cleavage and relative softness (it can be scratched by a copper penny but not a fingernail). It is commonly found in Mexico, Brazil, and the USA. Collectors should look for its characteristic waxy feel when polished.