49.6/lbs Blue Kyanite Crystal #041 with clear Quartz, Black Tourmaline and Mica

Blue Kyanite Crystal Specimen #041 with with clear Quartz, Black Tourmaline and Mica. Mounted on a custom Rotating Base! Height: 49.6/lbs 22.5/kgs Overall Height: 25.5" (648mm) Specimen Dimensions: 21" x 7" x 9 1/2" (534mm x 178mm x 242mm) What is Kyanite? Kyanite is a mineral found mainly in metamorphic rocks. It most often forms from the high-pressure alteration of clay minerals during the metamorphism of sedimentary rocks. It is found in the schists and gneises of regionally metamorphosed areas and less often in quartziteor eclogite. Kyanite's typical habit is a bladed crystal, although it sometimes occurs as radiating masses of crystals. Kyanite is often associated with other metamorphic minerals such as garnet, staurolite, and corundum Kyanite's Unusual Hardness Kyanite specimens have a variable hardness. The long crystals have a Mohs Hardness of about 4.5 to 5 if tested parallel to the length of a crystal, and a hardness of 6.5 to 7 if tested across the short dimension o