Fossil leaves are botanical remains preserved in sedimentary rock through carbonization or impressions. Collectors look for high-contrast specimens in fine-grained shale where venation and margins are clearly defined.

Hardness

2-4

Mohs

Luster

Dull

Streak

White

Transparency

Opaque

fossilcommon

Fossil Leaf

Hardness: 2-4
Luster: Dull
Streak: White
Transparency: Opaque

Is this fossil leaf?

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 fossil leaf with a known reference. Fossil Leaf sits at Mohs 2-4 — softer than the next harder reference, harder than the previous one.
2
Check the streak
Drag the specimen across an unglazed porcelain plate. Fossil Leaf leaves a white streak.
3
Read the luster
Hold the specimen under a strong light. Fossil Leaf typically shows a dull luster.
4
Match the color range
Compare against the expected color range: brown, black, gray, tan.
5
Look at form & habit
Typical habit: impressed.

Often found alongside fossil leaf

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

All properties

Mohs hardness: 2-4
Density: 2.0-2.5 g/cm³
Colors: Brown Black Gray Tan
Streak: White
Luster: Dull
Transparency: Opaque
Crystal habit: Impressed
Cleavage: None
Rarity: Common
Uses: Collector, Decorative, Scientific
Host rock: Shale
Typical price: $10-100 per specimen

Where rockhounds find fossil leaf

Classic worldwide localities

Florissant, Colorado, USA
Green River Formation, USA
Messel Pit, Germany
Hokkaido, Japan

Field-hunting tip

Look in shale country — that is the host setting where fossil leaf typically forms. If you start seeing calcite, clay minerals, pyrite in float, you are in the right ground. Field specimens usually show a impressed habit, so train your eye for that shape before scanning the outcrop.

Common questions

How do you identify fossil leaf?+

Mohs hardness is 2-4. It typically shows a dull luster. The streak is white. Common colors include brown, black, gray, tan.

Where is fossil leaf found?+

Notable localities include Florissant, Colorado, USA; Green River Formation, USA; Messel Pit, Germany; Hokkaido, Japan.

How much is fossil leaf worth?+

Typical asking prices fall in the range of $10-100 per specimen. Quality, size, and provenance can move individual specimens well outside that range.

What minerals are found with fossil leaf?+

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

What kind of rock does fossil leaf form in?+

Fossil Leaf typically forms in shale. Working float back to the host body is the standard way to chase a fresh occurrence.

What is fossil leaf used for?+

Fossil Leaf is used in collector, decorative, scientific.

Find fossil leaf on the map

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