"WardsSci000478"

White, fine, massive, opaque to slightly translucent.

Light gray, earthy.

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

This combination unit indicates the inside and outside temperatures and the indoor humidity.

Brownish gray, kerogen-rich; commercial oil source.

Measure relative humidity with weather bureau-type wet and dry bulb thermometers. Pocket-sized psychrometer is perfect for student use, as it presents no mercury hazards.

Vente

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

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

Vente

Polished, etched iron meteorite slice showing Widmanstatten structure, 1–1 1/2".

Vente

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

Vente