Model, Aragonite Crystal, is a carbonate mineral, one of the two common, naturally occurring, crystal forms of calcium carbonate, CaCO3, It is formed by biological and physical processes, includes 44 1 inch balls,
Model, Alpha- Corundum Crystal, is best known for its gem varieties, Ruby and Sapphire. Ruby and Sapphire are scientifically the same mineral, but just differ in color, Dimensions: 36 x 24 x 20 in, Weight: 8 lbs
Model, Calcite (1/2 unit cell) Crystal, is a carbonate mineral and the most stable polymorph of calcium carbonate (CaCO3), The other polymorphs are the minerals aragonite and vaterite, includes 66 1 inch balls, Dimen