mineral
Tumbled orange calcite
Calcite, CaCO₃
AI-generated identification · may be incorrectLikely Mohs hardness 3; translucent honey-orange with a vitreous to waxy polish, trigonal crystal system, and perfect rhombohedral cleavage. The image alone cannot confirm the mineral; similar-looking tumbled stones include quartz and agate.
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Physical properties
Likely Mohs hardness 3; translucent honey-orange with a vitreous to waxy polish, trigonal crystal system, and perfect rhombohedral cleavage. The image alone cannot confirm the mineral; similar-looking tumbled stones include quartz and agate.
Formation & geological history
Calcite forms in sedimentary environments, hydrothermal veins, and cavities in limestone; specimens may be millions to hundreds of millions of years old. This piece appears mechanically tumbled and polished.
Uses & applications
Decorative and collectible stone; calcite is also used in cement, lime, and industrial fillers.
Geological facts
Calcite effervesces in dilute acid and is readily scratched by a steel knife; orange color commonly comes from iron impurities.
Field identification & locations
A small polished pebble with translucent orange color is consistent with orange calcite, but confirm by its softness and acid reaction. Calcite occurs worldwide, especially in limestone regions.
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Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
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Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
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Unidentified pink-and-gray mineral or rock specimen
Undetermined; the image is too blurry for reliable identification
mineral