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. |