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Mineralpedia Details for Genthelvite

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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)3
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 
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Genthelvite from Mont Saint-Hilaire, Rouville Co., Quebec, Canada

Genthelvite
            from Mont Saint-Hilaire, Rouville Co., Quebec, 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.

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Genthelvite from El Criollo mine, Cerro Blanco Tanti, Cordoba, Argentina

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.

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Genthelvite from Washington Pass, Okanogan Co., Washington, United States

Genthelvite
            from Washington Pass, Okanogan Co., Washington, United States

Pink crystal to nearly 1mm.

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