Blue Fluorite is highly prized by collectors for its intense, electric hues and sharp cubic geometry. It is most frequently found in hydrothermal vein deposits or within cavities of limestone where it grows alongside galena and quartz.
Is this blue fluorite?
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 blue fluorite with a known reference. Blue Fluorite sits at Mohs 4 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Blue Fluorite leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Blue Fluorite typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: blue, deep blue, sky blue, violet-blue.
- 5Look at form & habitCrystal system: cubic. Typical habit: cubic crystals, octahedral crystals, massive.
Often confused with
Blue Fluorite vs. its common look-alikes — and how to tell them apart in the field.
Often found alongside blue fluorite
Minerals reported to co-occur with blue fluorite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- CaF₂
- Mohs hardness
- 4
- Density
- 3.1-3.2 g/cm³
- Streak
- White
- Luster
- Vitreous
- Transparency
- Transparent
- Crystal system
- Cubic
- Crystal habit
- Cubic Crystals, Octahedral Crystals, Massive
- Cleavage
- Perfect Octahedral
- Fluorescence
- Often Deep Blue or Purple Under UV Light
- Rarity
- Uncommon
- Uses
- Collector, Decorative, Lapidary
- Host rock
- Hydrothermal Veins, Sedimentary Limestone Cavities
- Typical price
- $10-100 thumbnail, $150-1500 large cabinet specimens
Where rockhounds find blue fluorite
1 mapped spotsClassic worldwide localities
- Cave-in-Rock, Illinois, USA
- Rogerley Mine, UK
- Asturias, Spain
- El Hammam, Morocco
- Xianghuapu Mine, China
Field-hunting tip
Look in hydrothermal veins, sedimentary limestone cavities country — that is the host setting where blue fluorite typically forms. If you start seeing quartz, calcite, galena in float, you are in the right ground. Field specimens usually show a cubic crystals, octahedral crystals, massive habit, so train your eye for that shape before scanning the outcrop. In the U.S., the densest reported localities are in Illinois — start trip planning there.
Common questions
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Find blue fluorite on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
