sedimentary
Jasper Conglomerate
Polymictic Conglomerate with Jasper and Quartz
Hardness: 6.5-7 on the Mohs scale, Color: Brown matrix with red to pink jasper clasts, Luster: Vitreous to dull, Crystal structure: Microcrystalline quartz, Cleavage: None, Specific gravity: 2.6-2.7
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 on the Mohs scale, Color: Brown matrix with red to pink jasper clasts, Luster: Vitreous to dull, Crystal structure: Microcrystalline quartz, Cleavage: None, Specific gravity: 2.6-2.7
Formation & geological history
Formed through the cementation of rounded gravel-sized rock fragments (clasts), specifically ancient jasper pebbles, in a finer-grained matrix. Often associated with Precambrian glaciations and river or beach deposits.
Uses & applications
Used primarily in lapidary work, decorative landscaping stones, cabochons, and as a collectible specimen.
Geological facts
Also known colloquially as 'puddingstone' due to its resemblance to a plum pudding, with bright red jasper pieces suspended in a darker matrix.
Field identification & locations
Easily identified by its contrasting colorful jasper pebbles embedded within a contrasting matrix. Commonly found in glaciated regions such as the Great Lakes area of North America and parts of Western Australia.
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