Gahnite

Gahniet, Gahnit, Gahnita, Ганит, 鋅類晶石


Commonly known      rarer (so called collectors stones)      very rare (rarities)      relatively rare organic material


Formula: ZnAl2O4
Mineral class: oxides
Crystal system: cubic
Mohs scale: 7.5 - 8
Density (g/cm3): 4.5 - 4.62
Refractive index: 1.791 - 1.818
Cleavage: indistinct
Colors: yellow, dark green, brown, black
Luster: vitreous
Fluorescence: -
Pleochroism: -
Largest Gahnite: 12.5 cm (Sterling Hill / New Jersey / USA)
Deposits: worldwide
1st Description: 1892
Name: in honor of the Swedish mineralogist John Gottlieb Gahn (1745 1818)

Gahnite Mineral

Size: 2.3 x 2.2 x 1.7 cm

Origin: Franklin / Sussex County / New Jersey / USA

Photo by kind permission of © www.irocks.com
Gahnite Mineral
Gahnite

Size: 1.15 x 0.54 x 0.25 cm
Weight: 2.26 ct
Origin: Brazil

Photo by kind permission of © www.djraregems.com

Gahnite Mineral

Size: 1.1 x 0.7 x 0.3 cm

Origin: Parelhas / Rio Grande do Norte / Brazil

Photo by kind permission of © www.lucianabarbosa.com
Gahnite Mineral
Gahnite

Weight: 1.25 ct

Origin: Parelhas / Rio Grande do Norte / Brazil

Photo by kind permission of © www.lucianabarbosa.com

Gahnite

Weight: 1.6 ct

Origin: Brazil

Photo by kind permission of © www.irocks.com


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