Dims: 4.36x3.16x2.58" (11.07x8.03x6.55cm)
Wt: 27.27oz (773g)
Xianghua Lin, Hunan Provence, China
A single, large octahedral crystal of fluorite adorns this specimen. It is slightly distorted, as two faces are longer than the other two, and instead of a point, the termination is a short ridge, and the bottom 4 sides are buried or missing. The surface texture is very rough, so it is difficult to be certain, but I believe that the fluorite is transparent. Held under a bright light, there are indications of colorless areas deep within the crystal, and the dark host rock may also be visible, while the fluorite appears a pale green over-all. The host rock is a black mineral (opaque and vitreous), with no crystals to assist in identification, and it contains inclusions and a coating of transparent fluorite, followed by a layer of translucent white crystals that look like quartz, and these in turn are partially covered with yellow dimly transparent crystals that look like sphene (but of course they may be something else, perhaps even one of the hundred habits of calcite).