metamorphic
Translucent calcite-rich rock, possibly calcite vein or marble
Calcite (CaCO₃), likely in a calcite-rich aggregate; exact rock identification is uncertain from the photo
AI-generated identification · may be incorrectCream to tan, translucent where illuminated, with a dull-to-vitreous luster and irregular fracture. Calcite has Mohs hardness 3, trigonal crystal structure, and three-direction rhombohedral cleavage; the image does not show diagnostic crystal faces or a reliable cleavage surface.
Identified More metamorphic →
Explore Translucent calcite-rich rock, possibly calcite vein or marble in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Cream to tan, translucent where illuminated, with a dull-to-vitreous luster and irregular fracture. Calcite has Mohs hardness 3, trigonal crystal structure, and three-direction rhombohedral cleavage; the image does not show diagnostic crystal faces or a reliable cleavage surface.
Formation & geological history
Calcite commonly precipitates from groundwater or hydrothermal fluids in fractures, and also forms marble when limestone recrystallizes during metamorphism. The specimen’s age and precise formation setting cannot be determined visually.
Uses & applications
Calcite is used in cement and lime, construction stone, and as a mineral specimen; clear, well-formed crystals may be collected or cut, though this rough piece does not show gem-quality features.
Geological facts
Calcite effervesces vigorously in dilute hydrochloric acid and can be scratched with a copper coin. The bright center appears to be transmitted or reflected light, so it does not establish that the whole piece is transparent.
Field identification & locations
A scratch test and a drop of dilute acid on a hidden spot can help distinguish calcite from harder quartz; avoid acid if preserving the specimen. The reported Oman-region location is compatible with carbonate rocks, but does not identify this specimen conclusively.
More like this
