Fluorescent calcite is a popular collector's mineral prized for its intense, vivid response under long-wave and short-wave ultraviolet light. It commonly occurs in rhombohedral or scalenohedral crystal habits and is most frequently found in limestone cavities or as a gangue mineral in ore deposits.
Is this fluorescent 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 fluorescent calcite with a known reference. Fluorescent 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. Fluorescent Calcite leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Fluorescent Calcite typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: white, colorless, yellow, orange, pink, blue.
- 5Look at form & habitCrystal system: trigonal. Typical habit: rhombohedral, scalenohedral, massive, or stalactitic.
Often confused with
Fluorescent Calcite vs. its common look-alikes — and how to tell them apart in the field.
Often found alongside fluorescent calcite
Minerals reported to co-occur with fluorescent 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, Scalenohedral, Massive, Or Stalactitic
- Cleavage
- Perfect Rhombohedral
- Fluorescence
- Bright Red, Orange, Or Pink Under UV Light
- Rarity
- Common
- Uses
- Collector, Lapidary
- Host rock
- Sedimentary Limestones, Hydrothermal Veins, And Metamorphic Marbles
- Typical price
- $5-50 for small specimens, $100-500+ for high-quality fluorescent cabinet pieces
Where rockhounds find fluorescent calcite
6 mapped spotsClassic worldwide localities
- Franklin, New Jersey, USA
- Terlingua, Texas, USA
- Mexico
- China
- Pakistan
Field-hunting tip
Look in sedimentary limestones, hydrothermal veins, and metamorphic marbles country — that is the host setting where fluorescent calcite typically forms. If you start seeing willemite, fluorite, barite in float, you are in the right ground. Field specimens usually show a rhombohedral, scalenohedral, massive, or stalactitic habit, so train your eye for that shape before scanning the outcrop. In the U.S., the densest reported localities are in Indiana, Missouri, Oklahoma — start trip planning there.
Common questions
How do you identify fluorescent calcite?+
Where is fluorescent calcite found?+
Can I find fluorescent calcite in the United States?+
How much is fluorescent calcite worth?+
What rocks look like fluorescent calcite?+
What minerals are found with fluorescent calcite?+
What kind of rock does fluorescent calcite form in?+
What is fluorescent calcite used for?+
Find fluorescent calcite on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
