Mineral Information and Data:

Genthelvite
Be3Zn4(SiO4)3S [CNMNC approved formula]

Named for Frederick August Ludwig Karl Genth (1820-1893), German-American mineralogist.

IMA status : Valid species (Pre-IMA 1944) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
76.02.04.03  
  (76) Tectosilicate Al-Si Framework
  (76.02) Feldspathoids and related species
  (76.02.04) Helvite group
  
Nickel-Strunz
(10th edition) :
09.FB.10
  (09) Silicates
  (09.F) Tektosilicates without Zeolitic H2O
  (09.FB) Tektosilicates with additional anions
  
Crystal system: Cubic System
Point group (H-M): 43m (or 4 3m) — hextetrahedral
  
  
  
Other Properties: Gemstone Extremely Rare.

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