Heubnerite is a dark reddish-brown submetallic to resinous mineral that forms monoclinic long prismatic striated crystals. It may occur granular massive or bladed and simple contact twinning is common. Heubnerite is a heavy mineral that is somewhat soft and slightly transparent. The deep red color is best seen at points where the crystals have been broken or chipped and viewed in a bright light source or natural sunlight. This mineral may be found on matrix with Casserite, Quartz, Fluorite, Tourmaline, or Topaz to name a few. Heubnerite was named for Adolph Heubner, a metallurgist of Freiburg, Saxony. The best specimens of this mineral tend to come from Colorado or Peru.
Rare Heubnerite on Quartz matrix from Silverton, Colorado
A very deep red, almost black color. Under direct lighting, hints of red may be seen on this Old Stock specimen of Acicular Heubnerite on Quartz matrix from Silverton, Colorado. This specimen is glued down to Styrofoam in a 2 x 2 x 1-1/4 inch (51 x 51 x 32mm) plastic display box. This was typical mounting in the 1970's. Specimens like this are very difficult to find. Weight included the display case and the mineral together.
This specimen weighs 1.1oz (33 g) and measures 1.5 x 1 x 0.5 in (39 x 26 x 12mm).
Heubnerite with Quartz from Peru
A very deep red, almost black color. Under direct lighting, hints of red may be seen on this rare specimen of Heubnerite from Peru. A very nice Quartz Crystal Cluster sets atop one end of this piece. Specimens like this are very difficult to find. (Photo emphasis is on the Heubnerite, not the Quartz cluster, taken to show the colors of the Heubnerite crystals.)
This specimen weighs 1oz (29 g) and measures 1.5 x 1.1 x 1.1 in (3.8 x 2.8 x 2.8 cm).