Honey calcite

Typically pale honey-yellow to amber, translucent, with vitreous to pearly luster and prominent rhombohedral cleavage; Mohs hardness 3, non-cubic trigonal crystal structure, and specific gravity about 2.71. The blocky shape and cleavage surfaces are consistent with calcite, though exact identification would require testing.

Forms in hydrothermal veins, limestone cavities, caves, and sedimentary carbonate deposits through precipitation from calcium-rich fluids. Calcite occurs from ancient to modern geological settings and has no single age.

Used in cement, lime, aggregates, soil treatment, and chemical manufacture; transparent honey calcite is collected and occasionally cut for ornamental objects, but is generally not a jewelry stone because it is soft.

Calcite effervesces strongly in dilute hydrochloric acid and shows birefringence, producing doubled images through clear pieces. Its yellow color commonly results from iron or other trace impurities.

Common worldwide, including Mexico, the United States, Iceland, and China. Confirm with a hardness test against a copper coin or knife, acid fizz, and rhombohedral cleavage; avoid scratching valuable specimens.