"WardsSci000478"

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

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

Vente

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

Light gray, earthy.

Vente

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

Vente

Brownish gray, kerogen-rich; commercial oil source.

Vente

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

Vente

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

Ward's® highest quality and purest mineral offerings.

Vente

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

Vente