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. |