mineral
Likely calcite crystal
Calcite (CaCO₃)
AI-generated identification · may be incorrectSmall, translucent to whitish crystal with tan staining and vitreous-to-pearly luster; calcite has Mohs hardness 3, trigonal crystal structure, and prominent rhombohedral cleavage. The photo alone does not confirm the identification.
Identified More mineral →
Explore Likely calcite crystal in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Small, translucent to whitish crystal with tan staining and vitreous-to-pearly luster; calcite has Mohs hardness 3, trigonal crystal structure, and prominent rhombohedral cleavage. The photo alone does not confirm the identification.
Formation & geological history
Typically precipitates from calcium-rich water in veins, caves, and sedimentary settings; calcite forms across many geological ages.
Uses & applications
Used in cement and lime production; clear crystals are collected, though this specimen appears modest in size and quality.
Geological facts
Calcite effervesces in dilute acid and is strongly birefringent in clear pieces.
Field identification & locations
Look for rhombohedral cleavage and easy scratching with a copper coin; common worldwide in limestone regions and hydrothermal veins.
More like this
Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Granite
Granite (Phaneritic intrusive igneous rock)
igneous