Red beryl crystals range in color from orange-red to purplish-red with medium tones. The largest crystal ever found weighed 54 carats. An average faceted gem stone weighs .15 carats with the largest at 8.0 carats. The only locality for red beryl crystals suitable for faceting is the Wah Wah mountains near Beaver, Utah. This is the only place in the world where gem quality red beryl has been found.
Ferberite with Quartz (by smulaxx) #Ferberite with Quartz Ferberite is the iron endmember of the manganese - iron wolframite solid solution series. The manganese endmember is hübnerite. Ferberite is a black monoclinic mineral composed of iron(II) tungstate, FeWO₄. Read More : http://en.wikipedia.org/wiki/Ferberite and http://rruff.info/doclib/hom/ferberite.pdf