Rock Identifier
Fossiliferous Sandstone / Quartzite Pebble (Sedimentary rock with skeletal fragments (e.g., Paleozoic crinoid/brachiopod fossils)) — fossil
fossil

Fossiliferous Sandstone / Quartzite Pebble

Sedimentary rock with skeletal fragments (e.g., Paleozoic crinoid/brachiopod fossils)

Hardness: 6-7 on Mohs scale. Color: Tan, brownish-pink to reddish-brown matrix with light grey to white translucent mineral inclusions and fossil fragments. Luster: Dull to granular, with vitreous patches on fossil cross-sections. Texture: Medium to coarse-grained sand grains.

Hardness
6-7 on Mohs scale
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Physical properties

Hardness: 6-7 on Mohs scale. Color: Tan, brownish-pink to reddish-brown matrix with light grey to white translucent mineral inclusions and fossil fragments. Luster: Dull to granular, with vitreous patches on fossil cross-sections. Texture: Medium to coarse-grained sand grains.

Formation & geological history

Formed in ancient shallow marine or coastal environments where silicate sand grains were deposited and cemented together alongside marine organism shells or skeletal remnants. Often stream-rounded or beach-worn during erosion and transport.

Uses & applications

Primarily of educational interest, amateur geological collecting, and rock tumbling/polishing.

Geological facts

Small white translucent rings and arcs visible embedded in the matrix are often fossilized crinoid stem segments or small shell cross-sections preserved in a quartz-rich sandstone base.

Field identification & locations

Look for rounded sand-sized quartz grains with embedded lighter-colored calcitic or silicified fossil fragments. Frequently found in riverbeds, glacial till, and gravel pits across North America and Europe.

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