"WardsSci000478"

Specimens illustrate important stages of mineral formation.

Clear rhombs showing double refraction.

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

Gray-to-brown basaltic, with over 50% vesicles.

Hematite-cemented quartz; orthoquartzite.

Gray, fine to medium-grained “Berea grit”.

Pure, bright yellow, Frasch sulfur.