What's That Rock?Marble
Limestone that has been changed by heat and pressure into a tight mass of interlocking calcite crystals. It sparkles faintly and polishes well.
How to identify Marble
- Sparkly, sugar-like crystals when broken
- Fizzes with strong acid
- Easily scratched by a knife
Often confused with
Is Marble valuable?
Common.
What changes the price
- Rock type: white statuary Carrara and rare colors cost far more than ordinary marble
- Slab size, thickness and pattern decide price for countertops and tiles
- Small polished pieces are inexpensive décor
Uses
- Sculpture, flooring, countertops
Care
Stains and etches easily from acids like lemon juice or vinegar.
Identifying a stone from a description or a photo is an estimate. Many stones look alike. Ask an expert or a gem lab before you buy, sell or rely on an identification.
Updated October 2026