Flint is a hard, cryptocrystalline form of quartz that occurs primarily as nodules within chalk and limestone sedimentary formations. Collectors look for its distinctive conchoidal fracture and waxy luster, which historically made it the preferred material for stone tools and fire starting.
Is this flint nodules?
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 flint nodules with a known reference. Flint Nodules sits at Mohs 7 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Flint Nodules leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Flint Nodules typically shows a waxy luster.
- 4Match the color rangeCompare against the expected color range: gray, black, brown, white.
- 5Look at form & habitCrystal system: trigonal. Typical habit: nodular.
Often confused with
Flint Nodules vs. its common look-alikes — and how to tell them apart in the field.
Often found alongside flint nodules
Minerals reported to co-occur with flint nodules. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- SiO₂
- Mohs hardness
- 7
- Density
- 2.60-2.65 g/cm³
- Streak
- White
- Luster
- Waxy
- Transparency
- Translucent
- Crystal system
- Trigonal
- Crystal habit
- Nodular
- Cleavage
- None
- Rarity
- Common
- Uses
- Lapidary, Decorative, Historical Tool Making
- Host rock
- Chalk
- Typical price
- $5-30 per nodule
Where rockhounds find flint nodules
2 mapped spotsClassic worldwide localities
- Dover England
- France
- Denmark
- United States
- Belgium
Field-hunting tip
Look in chalk country — that is the host setting where flint nodules typically forms. If you start seeing calcite, chalk, quartz in float, you are in the right ground. Field specimens usually show a nodular habit, so train your eye for that shape before scanning the outcrop. In the U.S., the densest reported localities are in Ohio — start trip planning there.
Common questions
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Find flint nodules on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
