Fort Payne Chert is a cryptocrystalline variety of quartz found primarily in the Mississippian-age limestone deposits of the Southeastern United States. It is highly valued by knappers and collectors for its conchoidal fracture and diverse range of earthy colors, often displaying distinctive banding or fossil inclusions.
Is this fort payne chert?
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 fort payne chert with a known reference. Fort Payne Chert sits at Mohs 6.5-7 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Fort Payne Chert leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Fort Payne Chert typically shows a waxy luster.
- 4Match the color rangeCompare against the expected color range: white, gray, brown, tan, black.
- 5Look at form & habitCrystal system: trigonal. Typical habit: massive.
Often confused with
Fort Payne Chert vs. its common look-alikes — and how to tell them apart in the field.
Often found alongside fort payne chert
Minerals reported to co-occur with fort payne chert. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- SiO₂
- Mohs hardness
- 6.5-7
- Density
- 2.55-2.65 g/cm³
- Streak
- White
- Luster
- Waxy
- Transparency
- Opaque
- Crystal system
- Trigonal
- Crystal habit
- Massive
- Cleavage
- None
- Rarity
- Common
- Uses
- Lapidary, Collector
- Host rock
- Sedimentary
- Typical price
- $5-30 per slab or nodule
Where rockhounds find fort payne chert
1 mapped spotsClassic worldwide localities
- Alabama, USA
- Tennessee, USA
- Kentucky, USA
Field-hunting tip
Look in sedimentary country — that is the host setting where fort payne chert typically forms. If you start seeing calcite, dolomite, limestone 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 Kentucky — start trip planning there.
Common questions
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Find fort payne chert on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
