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Give Your Students a Lesson in Economics as Well as Geology

Activities to Examine the Appearance of Minerals

A variety of tensile strengths and physical traits represented.

Substantial Set of Economically Important Minerals

Good grade, green, massive; copper ore.

Nearly pure, green crystalline forsterite.

Red, classic oolitic texture.

Brown, fluorescent crystals intergrown in dolomite rock.

Brown, earthy, massive; used for yellow pigment.

Black, Micaceous, glittery metallic.

White, fine, massive, opaque to slightly translucent.

White, massive, coarse crystalline vein, Mohs’ hardness of 7.

Amphibole group; black, coarse, massive.

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

Pure, white, earthy “China clay”.

Cleaned, pure, bright, metallic native copper.