Dims: 1.5 x 1.1 x 0.5" (3.8 x 2.8 x 1.3 cm)
Wt: 10.2 g
Boulby Potash Mine, Cleveland, Yorkshire, England
This small thumbnail specimen consists of a small crust made almost entirely of cubic Boracite crystals. These crystals range in diameter from 1 to 3 mm and are rather warped and heavily intergrown, so that only a few show any definite cubic form. However, they are generally in excellent condition, showing very little damage. All have a pale greenish blue color and a bright pearly luster, and are dimly transparent.