Phosphorite is a sedimentary rock that contains a high concentration of phosphate minerals, typically apatite group members. It is often found as nodular or massive beds in marine environments and is the primary source of phosphorus for industrial fertilizer production. Collectors prize these for their often-biogenic origin, as they frequently contain fossilized bone fragments or shark teeth.
Is this phosphorite?
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 phosphorite with a known reference. Phosphorite sits at Mohs 3-5 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Phosphorite leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Phosphorite typically shows a dull luster.
- 4Match the color rangeCompare against the expected color range: gray, brown, black, white, yellow.
- 5Look at form & habitTypical habit: massive.
Often confused with
Phosphorite vs. its common look-alikes — and how to tell them apart in the field.
How to tell apart: Flint Nodules is the harder of the two (Mohs 7 vs. 3-5); luster reads dull on Phosphorite and waxy on Flint Nodules.
How to tell apart: Luster reads dull on Phosphorite and dull to earthy on Limestone.
How to tell apart: Luster reads dull on Phosphorite and vitreous on Dolomite.
Often found alongside phosphorite
Minerals reported to co-occur with phosphorite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Mohs hardness
- 3-5
- Density
- 2.0-3.0 g/cm³
- Streak
- White
- Luster
- Dull
- Transparency
- Opaque
- Crystal habit
- Massive
- Cleavage
- None
- Rarity
- Common
- Uses
- Industrial, Agricultural, Collector
- Host rock
- Sedimentary Deposits
- Typical price
- $5-20 per specimen
Where rockhounds find phosphorite
6 mapped spotsClassic worldwide localities
- Florida, USA
- North Carolina, USA
- Morocco
- China
- Russia
Field-hunting tip
Look in sedimentary deposits country — that is the host setting where phosphorite typically forms. If you start seeing calcite, quartz, dolomite 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 Utah — start trip planning there.
Common questions
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Find phosphorite on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
