DUMORTIERITE
Specimen dum-2

Dims:3.1x2.1x0.6" (7.9x5.3x1.5 cm)

Wt: 2.7oz. (76g)

Pershing cty., Nevada

At first glance, this specimen appears to be an impure mica schist. Upon examination with a loupe, however, the "mica" turns out to be thousands of tiny radiating needles of dumortierite in a quartz host. The needles range up to 0.1" (0.3cm) in length, and are translucent. These crystals are greenish in color. This is a fascinating specimen to examine under a loupe.

Dims: 1.11x0.74x0.46" (2.81x1.88x1.16cm)

Wt: 0.32oz (9.2g)

Canta, Peru

This little blue rock is an example of the mineral dumortierite. It is a dull, slightly gray-blue color. A loupe reveals that it is multi-crystalline, being composed of intergrown millimeter sized clusters that show a radial pattern, darker in the middle.