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Genthelvite - Huanggang Fe-Sn deposit, Hexigten Banner, Ulanhad League, Inner Mongolia Autonomous Region, China
(#:MINS8875)
Sharp, brown, tetrahedral crystals of Genthelvite up to 3-4 mm wide on magnetite matrix.From the find that stroke the market about 10 years ago and hasn't been repeated since.
Formula :
Zn
4
(Be
3
Si
3
O
12
)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).
Specimen weight:188 gr.
Crystal size:3-4 mm on edge
Overall size: 60mm x 50 mm x 43 mm
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