White calcite is a very common calcium carbonate mineral that is easily identified by its rhombohedral cleavage and relative softness. It reacts vigorously with dilute hydrochloric acid, which distinguishes it from similar-looking quartz. Collectors prize it for its diverse crystal habits and its often spectacular fluorescence under ultraviolet light.
Is this white calcite?
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 white calcite with a known reference. White Calcite sits at Mohs 3 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. White Calcite leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. White Calcite typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: white, colorless.
- 5Look at form & habitCrystal system: trigonal. Typical habit: rhombohedral crystals, massive, granular.
Often confused with
White Calcite vs. its common look-alikes — and how to tell them apart in the field.
Often found alongside white calcite
Minerals reported to co-occur with white calcite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- CaCO₃
- Mohs hardness
- 3
- Density
- 2.71 g/cm³
- Streak
- White
- Luster
- Vitreous
- Transparency
- Translucent
- Crystal system
- Trigonal
- Crystal habit
- Rhombohedral Crystals, Massive, Granular
- Cleavage
- Perfect Rhombohedral
- Fluorescence
- Often Bright Pink or White Under SW UV
- Rarity
- Common
- Uses
- Collector, Educational, Industrial
- Host rock
- Limestone, Marble, Hydrothermal Veins
- Typical price
- $5-30 for cabinet specimens
Where rockhounds find white calcite
1 mapped spotsClassic worldwide localities
- Mexico
- USA
- Iceland
- Germany
- China
Field-hunting tip
Look in limestone, marble, hydrothermal veins country — that is the host setting where white calcite typically forms. If you start seeing fluorite, quartz, galena in float, you are in the right ground. Field specimens usually show a rhombohedral crystals, massive, granular habit, so train your eye for that shape before scanning the outcrop. In the U.S., the densest reported localities are in Missouri — start trip planning there.
Common questions
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Find white calcite on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
