sedimentary
Puddingstone (Quartzite Pebble)
Metaconglomerate / Jasper-Quartzite Pebble
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
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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.
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