Shale is a fine-grained sedimentary rock formed from the compaction of silt and clay-sized mineral particles. It is defined by its characteristic fissility, allowing it to split into thin, parallel layers along bedding planes. It is the most abundant sedimentary rock on Earth and frequently contains fossils or organic material.

Hardness

2-3

Mohs

Luster

Dull

Streak

White

Transparency

Opaque

sedimentarycommon

Shale

Hardness: 2-3
Luster: Dull
Streak: White
Transparency: Opaque

Is this shale?

5-step field check

Run through these checks against the specimen in your hand. The more boxes tick, the more confident the ID.

1
Test the hardness
Try to scratch shale with a known reference. Shale sits at Mohs 2-3 — softer than the next harder reference, harder than the previous one.
2
Check the streak
Drag the specimen across an unglazed porcelain plate. Shale leaves a white streak.
3
Read the luster
Hold the specimen under a strong light. Shale typically shows a dull luster.
4
Match the color range
Compare against the expected color range: gray, black, red, brown, green.
5
Look at form & habit
Typical habit: fissile, laminated, massive.

Often confused with

Shale vs. its common look-alikes — and how to tell them apart in the field.

Often found alongside shale

Minerals reported to co-occur with shale. Spotting these in float or country rock is a strong cue you are in the right ground.

All properties

Mohs hardness: 2-3
Density: 2.0-2.6 g/cm³
Colors: Gray Black Red Brown Green
Streak: White
Luster: Dull
Transparency: Opaque
Crystal habit: Fissile, Laminated, Massive
Cleavage: None
Rarity: Common
Uses: Industrial, Construction, Collector
Host rock: Sedimentary Basins
Typical price: $1-20 per specimen

Where rockhounds find shale

2 mapped spots

Classic worldwide localities

USA
China
Canada
Germany
United Kingdom

Field-hunting tip

Look in sedimentary basins country — that is the host setting where shale typically forms. If you start seeing quartz, clay minerals, calcite in float, you are in the right ground. Field specimens usually show a fissile, laminated, massive habit, so train your eye for that shape before scanning the outcrop. In the U.S., the densest reported localities are in Montana, New Jersey — start trip planning there.

Browse 2 U.S. spots for shale →

Common questions

How do you identify shale?+

Mohs hardness is 2-3. It typically shows a dull luster. The streak is white. Common colors include gray, black, red, brown.

Where is shale found?+

Notable localities include USA; China; Canada; Germany; United Kingdom.

Can I find shale in the United States?+

RockHoundR maps 2 shale rockhounding spots across 2 U.S. states — the top states are Montana, New Jersey.

How much is shale worth?+

Typical asking prices fall in the range of $1-20 per specimen. Quality, size, and provenance can move individual specimens well outside that range.

What rocks look like shale?+

Shale is most often confused with Slate, Siltstone, Mudstone. A quick hardness test and a streak check separate the look-alikes faster than color alone.

What minerals are found with shale?+

Shale commonly co-occurs with Quartz, Clay minerals, Calcite, Pyrite, Feldspar. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does shale form in?+

Shale typically forms in sedimentary basins. Working float back to the host body is the standard way to chase a fresh occurrence.

What is shale used for?+

Shale is used in industrial, construction, collector.

Find shale on the map

RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.