Chocolate Calcite Bookends, Pakistan ed10ce8492811be02f7a425d8730a8ae it is a silicon dioxide

it is a silicon dioxide crystal

Its color and opacity are determined by the type of tree that produced the resin

Apophyllite frequently occurs in zeolite minerals in basalt

The most valuable shape in the gem trade is a perfectly spherical pearl

Fossil bones are created by the slow replacement of bone molecules with the molecules of minerals in ground water

Chocolate Calcite Bookends, Pakistan ed10ce8492811be02f7a425d8730a8ae it is a silicon dioxideCalcite is one of the most common minerals which grows in a wide variety of different shapes, colors and translucencies. The mineral itself actually belongs to a calcite group of "related carbonates" that are "isomorphous" with each other. All members of the group crystalize in triangular formations, have perfect rhombohedron cleavages, and in transparent rhombohedrons, display strong double refractions. Aragonite and Calcite are similar in chemical