Green calcite is a massive variety of calcite colored by trace inclusions, typically chlorite or other secondary minerals. It is highly valued by collectors for its soft, pastel green hues and is often fashioned into tumbled stones or small decorative carvings. It can be easily identified by its characteristic rhombohedral cleavage and relative softness compared to similar green minerals like fluorite.
Is this green 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 green calcite with a known reference. Green 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. Green Calcite leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Green Calcite typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: green, light green, emerald green.
- 5Look at form & habitCrystal system: trigonal. Typical habit: massive.
Often confused with
Green Calcite vs. its common look-alikes — and how to tell them apart in the field.
How to tell apart: Fluorite is the harder of the two (Mohs 4 vs. 3).
How to tell apart: Prehnite is the harder of the two (Mohs 6-6.5 vs. 3).
How to tell apart: Luster reads vitreous on Green Calcite and greasy on Serpentine.
Often found alongside green calcite
Minerals reported to co-occur with green 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
- Massive
- Cleavage
- Perfect Rhombohedral
- Fluorescence
- Often Fluorescent Under SW or LW UV
- Rarity
- Common
- Uses
- Collector, Decorative, Lapidary
- Host rock
- Hydrothermal Veins, Limestone
- Typical price
- $5-30 for small to medium specimens
Where rockhounds find green calcite
2 mapped spotsClassic worldwide localities
- Mexico
- Brazil
- China
- USA
Field-hunting tip
Look in hydrothermal veins, limestone country — that is the host setting where green calcite typically forms. If you start seeing quartz, dolomite, siderite 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 Missouri, Pennsylvania — start trip planning there.
Common questions
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Find green calcite on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
