"STEM kits"

Calcite is a translucent calcium carbonate mineral, mohs hardness 3.

A textbook example of pure crystalline carbon which is extermely soft.

Selenite is a Clear gypsum mineral with a moh's hardness of 2.

Red clastic rock composed of sand sized particles and hematite.

Limestone is a gray calcium carbonate that will fizz with dilute HCl.

Gray to tan clastic rock made of silt sized particles.

Breccia is a sedimentary rock made up of angular rock fragments.

Bituminous rich black shale for hands-on investigations.

Carbonate rock formed by the precipitation from water.

Pegmatite is igneous rock similar to granite but with larger crystals.

Obsidian is hard black colored, volcanic glass.

Scoria is a dark-colored rock formed from lava with a high gas content.

Quartzite is hard, non-foliated rock formed from metamorphosed quartz sandstones.

Pink Gneiss is foliated pink and black bands of biotite.

Slaty metamorphic rock containing hematite giving it its red color.

Gray metamorphosed shale showing "slaty cleavage".