THE MATERIAL LIBRARY
Autumn Hickoryite
A trade name for patterned rhyolitic material.
Colors & patterns
Cream, pink, reddish brown, yellow and earthy bands.
Typical origins
Associated with Rodeo in Durango, Mexico.
Hardness
Variable; verify the supplied material
Choosing & setting this material
Flowing patterns work well in large focal cabs. Trade descriptions and reported hardness vary, so confirm the particular rough before choosing a ring setting.
Care & cleaning
Clean gently with lukewarm water, a little mild soap and a soft cloth, then dry. Avoid steam, ultrasonic cleaners, harsh chemicals and sudden temperature changes, especially when treatments are unknown.
Origins above describe typical sources of the material, not the origin of an illustrated or stocked stone. Hardness measures scratch resistance, not resistance to breaking. Confirm the identity and treatments of the actual piece.
Further reading: Material reference · GIA: gem treatments