Mineralpedia Details for Genthelvite
Genthelvite
Named for Frederick August Ludwig Karl Wilhelm Genth, who was a German-American mineralogist who described a zinc-rich helvite that was later renamed genthelvite. It is an uncommon mineral, but widespread, and can be found in the United States, Canada, Norway, England, Scotland, Nigeria, Argentina, Greenland, Russia, and the region of Karelia. Genthelvite can fluoresce a bright green under long- and short-wave ultraviolet light and it is also phosphorescent.
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/genthelvite.pdf
- Formula
- Be3Zn4(SiO4)3S
- Crystal System
- Isometric
- Cleavage
- None, None, None
- Luster
- Vitreous (Glassy)
- Color
- blue green, brown, colorless, green, yellow
- Streak
- white
- Class
- Isometric - Hextetrahedral
- Fracture
- Brittle - Uneven
- Hardness
- 6-6.5
- WebMineral
- View Genthelvite
- Mindat
- View Genthelvite
Genthelvite from Poudrette quarry, Mont Saint-Hilaire, Montérégie, Québec, Canada
Creamy white Genthelvite crystals to 2mm with Aegerine (large black crystal) .
Fluorescent green crystal cluster of honey yello Genthelvite to 7mm on platy Albite matrix.
Genthelvite from El Criollo mine, Cerro Blanco Tanti, Cordoba, Argentina
- Special Info
- EDS Confirmed
Blue, rare for genthelvite, crude crystals with triangular outlines to 3mm in Hematite matrix. Confirmed.
Genthelvite from Washington Pass, Okanogan Co., Washington, United States
Pink crystal to nearly 1mm.
