"gel box"

Feldspar group; calcium end member plagioclase crystals in pyroxene matrix.

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

Deep blue, massive, with nepheline; key feldspathoid.

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

Deep purple crystal clusters.

Shiny crystal clusters and crystalline groups, this 'fools gold' is brassy and leaves a black streak.

Pure, bright yellow, Frasch sulfur.

Dark brown to black; polycrystalline zinc ore.

Classic “peacock” aluminum ore.

Cut black mica cleavage sheets.

Good grade, bronze-colored ore, massive.

Clear, euhedral points and sections.