Yellow Calcite is a vibrant variety of calcite valued by collectors for its warm, honey-like hues. It is frequently found as rhombohedral clusters in limestone or marble deposits and is easily identified by its distinctive triple-cleavage and reactivity to weak acids.
Is this yellow 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 yellow calcite with a known reference. Yellow 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. Streak: white.
- 3Read the lusterHold the specimen under a strong light. Luster: vitreous.
- 4Match the color rangeCompare against the expected color range: yellow, honey yellow, amber.
- 5Look at form & habitCrystal system: trigonal. Typical habit: rhombohedral crystals, scalenohedral, massive.
Often confused with
Yellow Calcite vs. its common look-alikes, and how to tell them apart in the field.
Often found alongside yellow calcite
Minerals reported to co-occur with yellow 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
- Colors
- Streak
- White
- Luster
- Vitreous
- Transparency
- Translucent
- Crystal system
- Trigonal
- Crystal habit
- Rhombohedral crystals, scalenohedral, massive
- Cleavage
- Perfect rhombohedral
- Fluorescence
- Often fluorescent yellow or pink under UV light
- Rarity
- Common
- Uses
- Collector, Decorative, Lapidary
- Host rock
- limestone, marble, hydrothermal veins
Where rockhounds find yellow calcite
2 mapped spotsClassic worldwide localities
- Mexico
- USA
- Iceland
- Romania
- China
Field-hunting tip
Where it forms: limestone, marble, hydrothermal veins. If you start seeing quartz, pyrite, siderite in float, you are in the right ground. Typical habit: rhombohedral crystals, scalenohedral, massive. 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.
More yellow calcite photos
Common questions
How do you identify yellow calcite?+
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Can I find yellow calcite in the United States?+
What rocks look like yellow calcite?+
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Find yellow calcite on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
