Belemnites are the fossilized internal guards (rostra) of extinct squid-like cephalopods from the Mesozoic era. They are typically found as bullet-shaped, solid calcareous structures that are frequently collected along Jurassic and Cretaceous aged coastlines and clay deposits.
Is this belemnite?
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 belemnite with a known reference. Belemnite sits at Mohs 3-4, softer than the next harder reference, harder than the previous one.
- 2Name the organismDecide what left the fossil before worrying about the rock. Organism: Extinct squid-like cephalopods (order Belemnitida). Age: Late Triassic to Late Cretaceous.
- 3Check the preservationPreservation: Calcite guard. That controls the weight, the hardness and how the piece takes a polish.
- 4Read the lusterHold the specimen under a strong light. Luster: dull to waxy.
- 5Match the color rangeCompare against the expected color range: brown, black, gray, tan.
Often confused with
Belemnite vs. its common look-alikes, and how to tell them apart in the field.
Often found alongside belemnite
Minerals reported to co-occur with belemnite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Mohs hardness
- 3-4
- Density
- 2.7-2.9 g/cm³
- Luster
- Dull to waxy
- Transparency
- Opaque
- Rarity
- Common
- Uses
- Collector, Educational, Lapidary
- Host rock
- sedimentary marine limestone and shale
- Organism
- Extinct squid-like cephalopods (order Belemnitida)
- Age
- Late Triassic to Late Cretaceous
- Preservation
- Calcite guard
Where rockhounds find belemnite
2 mapped spotsClassic worldwide localities
- United Kingdom
- Germany
- Poland
- Russia
- France
Field-hunting tip
Where it forms: sedimentary marine limestone and shale. If you start seeing calcite, pyrite, ammonites in float, you are in the right ground. In the U.S., the densest reported localities are in New Jersey. Start trip planning there.
Common questions
How do you identify belemnite?+
Where is belemnite found?+
Can I find belemnite in the United States?+
What rocks look like belemnite?+
What minerals are found with belemnite?+
What kind of rock does belemnite form in?+
What is belemnite used for?+
Find belemnite on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
