Huebnerite

MnWO

Hardness: 5-5.5
Specific Gravity: 7.1-7.5
Huebnerite is a manganese rich tungsten ore. It is named for the German mineralogist, Adolph Huebner. Tungsten is used as a filament in light bulbs and it is used in carbide drilling equipment. Other tungsten ore minerals that are somtimes associated with Huebnerite:

Ferbrite is an iron rich tungsten ore, and Wolframite is said to be a composition between manganese and iron.

This specimen is from:

THE ADAMS LODE MINE
BONITA MOUNTAIN
SILVERTON, COLORADO – SAN JUAN COUNTY

Special thanks to:

JEANNE’S ROCK & JEWELRY
5420 BISSONNET at CHIMNEY ROCK
BELLAIRE, TX 77401 USA
PH: 713-664-2988 FAX: 713-664-1714
SOUTHWEST HOUSTON

Huebnerite