Dims: 3.5 x 2.7 x 2.1" (8.9 x 6.9 x 5.3 cm)
Wt: 10.0 oz. (287 g)
Thomas Range, Juab County, Utah, U.S.A.
This large hand specimen consists of several Topaz crystals resting in a hollow in a chunk of rhyolite. All but one of the crystals measure 0.1" (3 mm) or less in length- the other crystal is about 0.6" (1.5 cm) long. It is in excellent condition, showing no damage, and though part of it is obscured by host rock, it appears to have excellent orthorhombic form, with well-defined edges and very clean faces that possess a vitreous luster. The crystal has a rich, golden-brown coloration and is transparent and quite clear, though it contains a few internal fractures and cloudy inclusions near its base. A small black, tabular crystal with a rhombic outline rests nearby, and a few tiny ones are partly embedded in the big crystal. I have recently been told by an experienced Utah native that these are likely hematite crystals.