Rough Blue Kyanite with Corundum / 1-2" AVG - 1 KILO LOT Menu Cubes their hard skeletons accumulate calcium

their hard skeletons accumulate calcium carbonate that is secreted by other members of the reef

Apophyllite is a silica-based mineral typically found in vesicles or crevices in volcanic rock

and most apatite is used to make phosphate for fertilizer or as a source of rare-earth metals like uranium and thorium

Avg Size Range: (1 inch)

Rough Blue Kyanite with Corundum / 1-2" AVG - 1 KILO LOT Menu Cubes their hard skeletons accumulate calciumQuantity: 1 kilogram Average size range: 1 to 2 inches Kyanite is an aluminum rich crystal that forms on metamorphic rock under extremely high pressure. Its distinctive blue color comes from iron and titanium, and some pieces with trace amounts of manganese can turn orange instead. This kyanite also contains inclusions of corundum, the same base mineral as rubies and sapphires.