"Specimens"

Gray with line crinoid columnal fragments.

Deep blue, massive, with nepheline; key feldspathoid.

Good grade, bronze-colored ore, massive.

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

Coarse-grained, with microcline, biotite and horblende phenocrysts.

Classic, very coarse-grained igneous texture.

Cut black mica cleavage sheets.

Feldspar group; greenish gray alkali feldspar, coarse crystalline, some iridescence.

Deep purple crystal clusters.

Light gray, compact, hard, opaque, microcrystalline silica mineral.

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

Amphibole group; dark greenish black cleavages, somewhat columnar.

Red, classic oolitic texture.

Hardened natural cement of calcium carbonate that binds other material such as gravel, sand, clay, and silt.

Clear, pure cleavages, Mohs’ hardness of 2.

Dark gray, with hornblende as the dominant mafic mineral.