Calcite

Calcite is a common mineral that's found in many places, including in the Earth's crust, in shells, and in the human skeleton. Calcite is a mineral not a rock, specifically a carbonate mineral, that is a common constituent of many sedimentary rocks, particularly limestone, meaning it is a key component of sedimentary rocks but not a rock itself, a common yet complex crystal.

Colors It Comes In - White or colorless, red, pink, orange, yellow, green, blue, purple, brown, and black.

Some Calcite is Fluorescent

Fracture Pattern - Conchoidal

Shape - Rhombohedral, Scalenohedral, Tabular, Prismatic, Acicular, Needle-like, Dogtooth, Rhombus. Calcite crystals can be rhombohedral, scalenohedral, tabular, acicular, prismatic, or needle-like.

Luster - vitreous to dull

Texture - Smooth texture, a waxy or glass like feel.

Where They Can Be Found - Calcite is a common mineral that forms in many geological environments, including in lakes, rivers, and oceans. It can also be found in caves, vugs, and where springs emerge on the surface.

Hardness On The Mohs Scale - 3 Out Of 10