Nautiloids are extinct marine cephalopod fossils characterized by their chambered shells, which range from straight, cone-like forms to tightly coiled shapes. They are typically found in marine sedimentary deposits where they have been replaced by minerals such as calcite or silica, often showing intricate internal suture patterns when polished or cross-sectioned.
Is this nautiloid?
2-step field checkRun through these checks against the specimen in your hand. The more boxes tick, the more confident the ID.
- 1Match the color rangeCompare against the expected color range: brown, gray, white, tan, black.
- 2Look at form & habitTypical habit: coiled or straight conical shell.
Often found alongside nautiloid
Minerals reported to co-occur with nautiloid. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Crystal habit
- Coiled or Straight Conical Shell
- Rarity
- Common
- Uses
- Collector, Decorative, Educational
- Host rock
- Sedimentary Rock
- Typical price
- $5-100 depending on preservation and size
Where rockhounds find nautiloid
Classic worldwide localities
- Morocco
- USA
- United Kingdom
- Germany
- China
Field-hunting tip
Look in sedimentary rock country — that is the host setting where nautiloid typically forms. If you start seeing calcite, quartz, pyrite in float, you are in the right ground. Field specimens usually show a coiled or straight conical shell habit, so train your eye for that shape before scanning the outcrop.
Common questions
Where is nautiloid found?+
How much is nautiloid worth?+
What minerals are found with nautiloid?+
What kind of rock does nautiloid form in?+
What is nautiloid used for?+
Find nautiloid on the map
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