"Avantor"

Feldspar group; good cleavages of pure soda lime feldspar; most show twinning and labradorescence.

When minerals, rocks, and fossils cannot be accurately identified by macroscopic observation and testing, thin section slides can reveal the composition and structure of the specimens on a microscopic level.

When minerals, rocks, and fossils cannot be accurately identified by macroscopic observation and testing, thin section slides can reveal the composition and structure of the specimens on a microscopic level.

Specimens Illustrate Smooth Mineral Breakage

Clear examples of a key method of identification.

Beginner’s Collection Illustrates Important Physical Properties

Geometric Shapes and Structures of Crystalline Minerals.

Samples of Minerals That Are Found in Rocks

Good grade, brass-yellow copper ore, massive.

Brown, fluorescent crystals intergrown in dolomite rock.

Amphibole group; dark greenish black cleavages, somewhat columnar.

Red, earthy, in natural chunk form; common pigment ore.

Bright blue crystalline veins and coatings in a matrix of mixed copper ore.

Pure kaolinite powder, 200 mesh.

Classic “peacock” aluminum ore.

Cut black mica cleavage sheets.