mineral

Honey Calcite Geode Segment

Calcite (Calcium Carbonate, CaCO3)

Hardness: 3 on Mohs scale; Color: Honey-yellow to amber; Luster: Vitreous to pearly; Crystal structure: Trigonal/Rhombohedral (small druzy crystals); Cleavage: Perfect rhombohedral; Specific Gravity: 2.71

Hardness: 3 on Mohs scale
Color: Honey-yellow to amber
Luster: Vitreous to pearly

Identified March 14, 2026More mineral →

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Physical properties

Formation & geological history

Formed through secondary precipitation of calcium carbonate from mineral-rich groundwater filling cavities (vugs) within sedimentary host rocks like limestone or shale. Often associated with the Mississippian or Devonian geological periods.

Uses & applications

Primarily used for decorative purposes, lapidary work, and crystal healing collections. Calcite in bulk is used in construction as an ingredient in cement and agricultural lime.

Geological facts

Calcite is famous for its double refraction (birefringence), where light passing through a clear crystal splits into two rays. It is also the primary component of stalactites and stalagmites in caves.

Field identification & locations

Identify in the field by its 3-way rhombohedral cleavage and its energetic reaction (fizzing) when a drop of cold dilute hydrochloric acid is applied. Commonly found in limestone quarries or sedimentary outcrops in the Midwest USA and Mexico.

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