The cat's eye effect in apatite is caused by the presence of parallel needle-like inclusions within the stone

This is a very desirable crystal

Size:  22

8 gram Impact Vesicular Breccia

Natural Black Kyanite | 164 grams | Marilac, Minas Gerais, Brazil Lunar The cat's eye effect inThis is a fabulous specimen of black kyanite mined in Marilac, Safira pegmatite district, Eastern Brazilian pegmatite province, Minas Gerais, Brazil. The specimen will sit perfectly flat to allow easy display in a favorable position. Kyanite is a silicate mineral and is known to be one of the most attractive natural minerals in the world. Frequently found with lustrous bladed crystals, the intensity of color varies by location of extraction. Kyanite