Huebnerite (Hübnerite)
It should not be difficult to find numerous small, faceted huebnerite gems (also hübnerite or hubnerite) among larger collections. Certainly ample material exists to cut a number of such gems, although they are rarely offered for sale.
Optics: a = 2.17-2.20; β= 2.22; γ= 2.30-2.32. Biaxial (+).
Streak: yellowish, reddish brown, blackish to greenish gray.
Occurrence: High-temperature hydrothermal ore veins; quartz veins in or near granitic rocks; Many localities in western United States (Colorado: Idaho; Nevada; New Mexico; Arizona; South Dakota).
France; Czechoslovakia; Australia.
Pasto Bueno, Peru: transparent crystals.
Comments: It should not be difficult to find numerous small faceted huebnerites among larger gemstone collections. Certainly ample material exists to cut a number of such gems, although they are rarely offered for sale.
Name: After Adolph Hubner, a metallurgist from Freiburg, Saxony (Germany). Ferberite was named after Rudolph Ferber, of Gera, Germany.