Dims: 4.56x2.79x2.33" (11.59x7.09x5.91cm)
Wt: 25.82oz (732g)
(lab grown, probably USA)
Actually, this chunck of pure silicon does not look like the usual single-crystal boules used to manufacture computer chips, but rather like a bi-product of that process (forming on the walls or floor of the over, or crystallizing when the melt is allowed to cool). One side of the specimen is nearly perfectly flat, except for a detailed pattern of ridges that look like crystals forming on the surface of a melt that has cooled. On the opposite side is an area that looks like a cavity within which some distinct crystals have formed, although I do not see how this could have happened in the lab, unless this is an artifact of the production of pure silicon from a slag containing other components that maintained a molten space within which the crystals could form.