"Avantor"

Beginner’s Collection Illustrates Important Physical Properties

Geometric Shapes and Structures of Crystalline Minerals.

Samples of Minerals That Are Found in Rocks

Give Your Students a Lesson in Economics as Well as Geology

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.

Feldspar group; white-to-gray cleavages of sodic plagioclase; some show twinning.

A classroom set that covers the major types of coal.

Clear rhombs showing double refraction.

Classic, white chalk, massive; from Cliffs of Dover, England.