"Avantor"

Formalin preserved sheep brain. Available in jars.

Formalin Preserved

Formalin Preserved

Formalin Preserved

Freeze-dried grassfrogs. Available in vacuum packs.

Dehydrated Preserved

Formalin preserved hagfish. Available in vacuum packs.

Formalin preserved ratfish. Available in vacuum packs.

Small 1–1.5 mm crystal, octahedrans or cubes, Mohs” hardness of 10.

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.

Crystals and crystal sections up to 1", Mohs’ hardness of 9.

Pure, large, transparent-to-translucent cleavages, Mohs’ hardness of 4.

Bright metallic cubic cleavages; lead ore.