sedimentary

Puddingstone (Quartzite Pebble)

Metaconglomerate / Jasper-Quartzite Pebble

AI-generated identification · may be incorrect

Hardness: 6.5-7 Mohs scale. Color: Yellowish-tan base matrix with rounded grey and quartz inclusions. Luster: Dull to sub-vitreous. Texture: Smooth, water-worn rounded pebble.

Hardness: 6
Luster: Dull to sub-vitreous

Identified July 23, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 Mohs scale. Color: Yellowish-tan base matrix with rounded grey and quartz inclusions. Luster: Dull to sub-vitreous. Texture: Smooth, water-worn rounded pebble.

Formation & geological history

Formed as a sedimentary conglomerate consisting of sand and gravel pebbles bound together by silica, subsequently subjected to mild heat and pressure (metamorphism) and smoothed by river or glacial erosion.

Uses & applications

Used for lapidary work, decorative rock gardens, aquariums, tumbling, and amateur rock collecting.

Geological facts

Puddingstone gets its name from its resemblance to traditional English plum pudding, featuring distinct colored pebbles embedded within a finer-grained matrix.

Field identification & locations

Identified by its distinctly visible embedded rounded clasts of quartz or chert contained within a fine-grained, cemented silicate matrix. Commonly found along riverbeds, beaches, and glacial till deposits.