sedimentary
Jasper Conglomerate
Polymictic Conglomerate (Quartz and Jasper clasts in a quartz-rich matrix)
Mohs hardness of 6.5 to 7; colors include dark brown, red, and white patches; vitreous to dull luster; cryptocrystalline structure; conchoidal fracture; specific gravity around 2.6 to 2.7.
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Physical properties
Mohs hardness of 6.5 to 7; colors include dark brown, red, and white patches; vitreous to dull luster; cryptocrystalline structure; conchoidal fracture; specific gravity around 2.6 to 2.7.
Formation & geological history
Formed through the cementation and lithification of rounded pebbles and rock fragments (clasts), often deposited by ancient rivers or streams, dating back to the Precambrian era.
Uses & applications
Primarily used as a decorative stone, lapidary material for cabochons and tumbled stones, and as specimens for rock collectors.
Geological facts
Also known as puddingstone due to its resemblance to a Christmas pudding, it often features striking red jasper pebbles embedded in a contrasting matrix.
Field identification & locations
Easily identified by its multicolored rounded pebbles cemented within a contrasting background. Commonly found in glacial drift areas, particularly around the Great Lakes region in North America.
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