mineral

Tumbled cream-colored stone, likely calcite or quartzite

Most consistent with massive calcite (CaCO₃), though visual identification is uncertain

AI-generated identification · may be incorrect

Pale yellow-cream, opaque, waxy to dull luster, rounded by tumbling, with fine crystalline texture; calcite hardness 3, rhombohedral cleavage, specific gravity about 2.71. A steel knife may scratch calcite, while quartzite would resist scratching.

Identified September 13, 2026More mineral →

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Physical properties

Formation & geological history

Calcite commonly forms from sedimentary or hydrothermal precipitation and may range from ancient to geologically recent; quartzite forms by metamorphism of quartz sandstone. A small tumbled piece cannot establish its age or exact origin.

Uses & applications

Calcite is used in cement, lime, aggregates, and decorative specimens; quartzite is used for construction stone and lapidary items. This specimen has modest collecting value.

Geological facts

A drop of dilute hydrochloric acid or vinegar may effervesce on fresh calcite surfaces, but not on quartzite; avoid acid testing if the piece is valuable.

Field identification & locations

Common sources include limestone and hydrothermal districts worldwide; identify by hardness, cleavage, and acid reaction. The image alone cannot distinguish calcite from pale quartzite, feldspar, or another tumbled stone.