Marble
Marble is a metamorphic rock composed of recrystallized carbonate minerals. It has been used for sculpture and architecture since ancient times.
Marble properties at a glance
| Type | Metamorphic Rocks |
|---|---|
| Chemical formula | CaCO3 |
| Mohs hardness | 3.5 |
| Luster | vitreous |
| Streak | White |
| Cleavage | Variable by mineral grains |
| Fracture | Granular |
| Specific gravity | 2.7 |
| Transparency | translucent |
| Common colors | White, Gray, Pink, Green, Black |
| Rarity | common |
Geology & background
Forms when limestone undergoes metamorphism from heat and pressure, recrystallizing the calcite.
Used in ancient Greek and Roman architecture, including the Parthenon and Roman Colosseum.
How to identify Marble
- Check whether the specimen's color and texture match typical Marble examples.
- Photograph a fresh surface in natural light and avoid shadows, glare, or wet surfaces.
- Use hardness, streak, luster, grain size, and locality together; no single trait is enough for every specimen.
Where Marble is found
Marble is reported from multiple localities or geological settings. Exact locality should be verified from specimen provenance, maps, or field notes.
How much is Marble worth?
| Entry-level specimen | $5 |
|---|---|
| Typical collector specimen | $50 |
| Premium specimen | $500+ |
Value depends on size, condition, color, crystal quality, locality, rarity, preparation, and provenance. Treat this as educational guidance, not an appraisal.
Common uses
- Sculpture
- Building material
- Countertops
- Flooring
Interesting facts
- Michelangelo's David is carved from Carrara marble
- The Taj Mahal is made of white marble from Rajasthan
- Pure marble is white; impurities create color variations
Care & safety
Treat Marble as a collector specimen unless hardness, cleavage, and fracture are confirmed.
Avoid inhaling dust. Do not cut, grind, or polish unknown specimens without eye protection and a properly rated respirator.
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