Encyclopedia » Herkimer Diamond

Herkimer Diamond


An 18-faceted, double-terminated, super clear quartz crystal first discovered in the late 1700s in Herkimer County, New York, USA. Its exceptional clarity is due to being formed extremely slowly in pockets of dolostone rock.



Healing Properties


Scientific info

Group: Quartz, oxide
Formula: Silicon dioxide (SiO2 + Al, Fe, Ca, Mg, Li, Na)
Growth: Trigonal (primary)
Appearance: Violet, purple, or grayish purple crystals
Hardness (Moh’s Scale): 7
Specific Gravity: 2.63 – 2.65
Mine Locations: Minas Gerais in Brazil, Australia, Cambodia, Canada, Czech Republic, India, Japan, Madagascar, Mexico, South Africa, Sri Lanka, Russia, United Kingdom, United States, Uruguay
Uses: Jewellry, ornamental


Michael Gienger, Crystal Power, Crystal Healing (London: Cassell & Co., 2000), 214-217.
Peter Darling, Crystal Identifier (New York: Shooting Star Press, Inc., 1996), 99.
Mindat.org. “Amethyst.” Accessed September 16, 2010 <http://www.mindat.org/min-198.html>