Sharp, brown, tetrahedral crystals of Genthelvite up to 9 mm wide on magnetite matrix with arsenopyrite xls in association.From the find that stroke the market 6 years ago and hasn't been repeated since.
Formula :
Zn4(Be3Si3O12)S
System: cubic Hardness:6-6½ Rarity:not common
Strunz id:VIII/J.12-20 -
SILICATES
Name origin: Named in 1944 by Jewel Jeannette Glass, Richard Henry Jahns, and Rollin Elbert Stevens for its relationship to helvite and for Fredrick August Ludwig Karl Wilhelm Genth [May 17, 1820 Wächtersbach, Hesse-Cassel - February 2, 1893 Philadelphia, Pennsylvania, USA], professor of mineralogy at the University of Pennsylvania. Genth first described genthelvite in 1892 but did not recommend a name. Genth description appears in Am. Jour. Sci., 44, 385 (1892). Glass, et.al., named the mineral after Genth in the reference listed on the genthelvite descriptive page - Am. Min., 29, Nos. 3 & 4, 163-191 (1944).
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 Specimen weight:180 gr.
 Crystal size:8 mm on edge
 Overall size: 72mm x 42 mm x 36 mm
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