Double terminated crystal
This article needs additional citations for verification. (December 2009) (Learn how and when to remove this template message)
A double terminated crystal is a crystal with two naturally faceted ends. Technically, they have a termination on both ends.  It is a rarer form of crystal as it forms free-floating in pockets of clay, rather than on one side of a stone. They are sought after by collectors and are often made into pendants.
According to Gems & Gemology, "the topmost grade of amethyst consists of double-terminated single crystals." 
- "Metaphysical Quartz Crystal Description:DOUBLE TERMINATED". www.crystalgenn.com. Retrieved 2018-05-01.
- Lucas, Andrew and Hsu Tao. "Moroccan Amethyst: Mining and Marketing." Gems & Gemology, vol. 53, no. 1, Spring2017, pp. 126-127. EBSCOhost, libproxy.howardcc.edu/login?url=https://search.ebscohost.com/login.aspx?direct=true&db=a9h&AN=123166330&site=ehost-live.
|This article about a specific mineral or mineraloid is a stub. You can help Wikipedia by expanding it.|