Dims: 3.0" x 1.5" x 1.3"(7.6 x 3.8 x 3.3 cm)
Wt: 2.31 oz.(65.5 g)
Grey Horse Mine, Pinal County, Arizona, U.S.A.
The Vanadinite crystals on this specimen have very intruguing, warped crystal forms. They occur in the hexagonal prismatic crystals that are common for this mineral, but the edges of the larger crystals grew much more quickly than the center, so there are stepped depressions in the middle of each crystal's basal face, producing a hopper crystal effect. This effect is so intense, however, that it looks more as if the crystals are hollow! They range in size from less than 1 mm to more than 1 cm in length, and all have a uniform golden-orange color and pearly luster, and are translucent. They rest on a crust of white quartz that coats the host rock.