Marble is a metamorphic rock formed by the recrystallization of limestone or dolostone under heat and pressure. It is prized by sculptors and architects for its uniform grain and ability to take a high polish. Collectors typically look for pieces with interesting veining caused by impurities like clay, silt, or iron oxides during the metamorphic process.
Is this marble?
5-step field checkRun through these checks against the specimen in your hand. The more boxes tick, the more confident the ID.
- 1Test the hardnessTry to scratch marble with a known reference. Marble sits at Mohs 3-4 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Marble leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Marble typically shows a subvitreous luster.
- 4Match the color rangeCompare against the expected color range: white, gray, black, yellow, green, pink, red.
- 5Look at form & habitTypical habit: massive.
Often confused with
Marble vs. its common look-alikes — and how to tell them apart in the field.
Often found alongside marble
Minerals reported to co-occur with marble. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Mohs hardness
- 3-4
- Density
- 2.5-2.7 g/cm³
- Streak
- White
- Luster
- Subvitreous
- Transparency
- Opaque
- Crystal habit
- Massive
- Cleavage
- None
- Rarity
- Common
- Uses
- Decorative, Construction, Sculpture, Lapidary
- Host rock
- Metamorphic Terrain
- Typical price
- $5-50 for slabs and polished specimens
Where rockhounds find marble
6 mapped spotsClassic worldwide localities
- Carrara, Italy
- Pentelicus, Greece
- Vermont, USA
- Makrana, India
- Danby, Vermont
Field-hunting tip
Look in metamorphic terrain country — that is the host setting where marble typically forms. If you start seeing calcite, dolomite, graphite in float, you are in the right ground. Field specimens usually show a massive habit, so train your eye for that shape before scanning the outcrop. In the U.S., the densest reported localities are in Maryland, Nevada, New Jersey — start trip planning there.
Common questions
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Find marble on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
