"WardsSci000478"

Light gray, earthy.

Brownish gray, kerogen-rich; commercial oil source.

Unpolished metamorphic rock with silky lusture, red-brown colour, and clear parallel intergrown quartz crystals.

Fine, common limestone; massive, and will fizzle with HCl.

White and black bands of quartz, feldspar, and biotite; typical foliation.

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

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Designed for Introductory College Petrography Labs.

Hematite-cemented quartz; orthoquartzite.

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