Blue apatite is a striking phosphate mineral valued for its vibrant, ocean-like hues and prismatic crystal forms. It is relatively soft and often exhibits a glassy luster, making it a favorite among collectors, though it requires careful handling for lapidary work due to its hardness of 5.
Is this blue apatite?
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 apatite with a known reference. Blue Apatite sits at Mohs 5, 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: blue, blue-green, teal.
- 5Look at form & habitCrystal system: hexagonal. Typical habit: prismatic crystals, tabular, massive.
Often confused with
Blue Apatite vs. its common look-alikes, and how to tell them apart in the field.
How to tell apart: Blue Apatite is noticeably harder (Mohs 5 vs. 4).
How to tell apart: Aquamarine is the harder of the two (Mohs 7.5-8 vs. 5).
How to tell apart: Beryl is the harder of the two (Mohs 7.5-8 vs. 5).
Often found alongside blue apatite
Minerals reported to co-occur with blue apatite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- Ca₅(PO₄)₃(F,Cl,OH)
- Mohs hardness
- 5
- Density
- 3.1-3.2 g/cm³
- Colors
- Streak
- White
- Luster
- Vitreous
- Transparency
- Translucent
- Crystal system
- Hexagonal
- Crystal habit
- Prismatic crystals, tabular, massive
- Cleavage
- Poor in one direction
- Fluorescence
- Often fluorescent blue or yellow under UV
- Rarity
- Common
- Uses
- Collector, Lapidary, Jewelry
- Host rock
- igneous rocks, pegmatites, hydrothermal veins
Where rockhounds find blue apatite
1 mapped spotsClassic worldwide localities
- Brazil
- Madagascar
- Canada
- Mexico
- Russia
Field-hunting tip
Where it forms: igneous rocks, pegmatites, hydrothermal veins. If you start seeing quartz, feldspar, calcite in float, you are in the right ground. Typical habit: prismatic crystals, tabular, massive. Train your eye for that shape before scanning the outcrop. In the U.S., the densest reported localities are in New Mexico. Start trip planning there.
More blue apatite photos
Common questions
How do you identify blue apatite?+
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What rocks look like blue apatite?+
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Find blue apatite on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
