"College - Geology"

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

Gray to white metamorphosed carbonate rock.

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

Gray to tan clastic rock made of silt sized particles.

Fluorite is Green Halide mineral with moh's hardness 4.

A favorite of collectors for over 50 years.

Massive sedimentary gypsum with a moh's hardness 2..

Obsidian is hard black colored, volcanic glass.

Conglomerate is a sedimentary rock made up rounded quartz pebbles.

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

Metamorphosed rock showing foliation and rich in hornblende.

Carbonate rock formed by the precipitation from water.

Gray metamorphosed shale showing "slaty cleavage".

Pink Gneiss is foliated pink and black bands of biotite.

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

Introduce your students to Gray Andesite with large phenocrysts of hornblende.