12x22to16x34mm Australian Tumbled Jet Side-Drilled

Australian jet. 12x22 to 16x34mm. Side drilled.

Australian jet. 12x22 to 16x34mm. Side drilled. This batch of jet beads is from an Australian mind.  Jet is an organic material; an ornamental form of lignite coal .  Its chemical composition is primarily carbon with some hydrogen and oxygen.  It has a resinous to vitreous luster.   It can be confused as plastic as both has similar hardness and specific gravity.   One way to identify it is jet burns easily with a coal or oil odor.  Never wash it in steamer or ultrasonic machine, only wash in warm soapy water.  The specific gravity is 1.32.