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Genthelvite

Introduction
 

	Genthelvite is a very rare mineral and virtually unknown as a gemstone.
	Genthelvite was first found in the West of Cheyenne Canyon, El Paso, colorado, U.S.A. in 1944 and was named after the German-American chemist and mineralogist, Frederick August Ludwig Karl William Genth (1820-1893), Professor of Chemistry, University of Pennsylvania.
Just The Facts

Genthelvite is a rare zinc beryllium sulfur silicate mineral of the Helvite group. Genthelvite is associated with Aegirine, Albite, Analcime, Ancylite, Astrophyllite, Calcite, Catapleiite, Fluorite, Leifite, Microcline, Polylithionite, Pyrochlore, Rhodochrosite, Serandite, Tetranatrolite and Wurtzite.
 

Genthelvite fluoresces intense green under ultraviolet radiation and remains phosphorescent (i.e. the persistent emission of light following exposure to and removal of a light source) for a short period.
 

Genthelvite is usually colorless, white or pale yellow on smaller crystals and white, pale to lemon-yellow, greenish yellow, very pale green, pale brown or red on larger crystals.