sedimentary
Catlinite
Pipestone (argillite)
AI-generated identification · may be incorrectMohs hardness of 2.5 to 3; deep red to brownish-red color; dull to waxy luster; fine-grained, massive crystal structure.
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Physical properties
Mohs hardness of 2.5 to 3; deep red to brownish-red color; dull to waxy luster; fine-grained, massive crystal structure.
Formation & geological history
Formed from compressed, fine-grained argillaceous sedimentary mudstones, often found in ancient river or lake beds.
Uses & applications
Traditionally carved into ceremonial Native American pipes and decorative items due to its softness.
Geological facts
Also known as sacred pipestone, it holds immense cultural and spiritual significance among many Indigenous North American tribes.
Field identification & locations
Identified by its signature soft, dark reddish-brown appearance and ease of carving; found primarily in Pipestone National Monument, Minnesota.
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