"Human Biology Lab Activities&amp"

Pure, bright yellow, Frasch sulfur.

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

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

Talc is the softest know mineral with a moh's hardness of 1, and composed of clay.

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

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

White to gray, medium to coarse-grained, crystalline.