mineral

Blue glassy mineral fragment, possibly blue calcite

Unconfirmed; blue calcite is calcium carbonate (CaCO₃)

AI-generated identification · may be incorrect

Opaque to translucent turquoise-blue with a vitreous to waxy luster and irregular fracture; hardness and crystal structure cannot be established from the image alone. The smooth, unusually uniform color could also indicate dyed or coated material.

Identified October 15, 2026More mineral →

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Physical properties

Formation & geological history

If calcite, it formed through precipitation or alteration in carbonate-rich rocks, commonly in veins and cavities; its geological age depends on the deposit. The image does not allow a reliable identification or age estimate.

Uses & applications

Blue calcite is collected and sometimes used for carvings or decorative pieces; this small fragment appears primarily suited to collecting.

Geological facts

Color alone is not diagnostic: blue calcite is relatively soft (Mohs 3) and reacts with dilute acid, while glass does not.

Field identification & locations

A closer view of cleavage, a hardness test, or acid reaction would help distinguish calcite from glass and other blue minerals. Blue calcite occurs in several countries, including Mexico and Madagascar.