"Dessus de bouchon"

Pure, bright yellow, Frasch sulfur.

Brown, earthy, massive; used for yellow pigment.

Fragments in natural condition, many showing concave forms and fusion crusts. Sizes are approximate.

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

Pyroxene group; dark green, pure cleaved fragments.

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

Cut black mica cleavage sheets.

Red, earthy, in natural chunk form; common pigment ore.

Feldspar group; white to gray, sodium plagioclase cleavages; some faces may show twinning.

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

Mica group; cut sheets showing basal cleavages. Books and sheets in bulk pack.

Our excellent series of standard thin sections features important and interesting rock-forming mineral types most often found in field samples.

Coarse, 'salt and pepper': dark pyroxene and light andesine. Provides perfect representation of an intermediate igneous rock.

When minerals, rocks, and fossils cannot be accurately identified by macroscopic observation and testing, thin section slides can reveal the composition and structure of the specimens on a microscopic level.

When minerals, rocks, and fossils cannot be accurately identified by macroscopic observation and testing, thin section slides can reveal the composition and structure of the specimens on a microscopic level.