"WardsSci000478"

An introductory rock set contains six samples from each of the three major rock types.

Vente

White, fine, massive, opaque to slightly translucent.

Large, black, rounded tektite, 1 1/2". Thailand.

Light gray, earthy.

Survey set improves student's recognition of all three major rock groups.

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

Vente

Brownish gray, kerogen-rich; commercial oil source.

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

Vente

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

Vente

Pure, bright yellow, Frasch sulfur.