"WardsSci000478"

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

Choice yellow-brown, globular to botryoidal crystal groups of this lead arsenate mineral. A secondary mineral in lead deposits forming a series with pyromorphite and vanadinite. Average size: 1" x 1" to 1 1/2" x 1 1/2". Mexico.

Dark, waxy, bitumin-rich.

Powdered bentonite clay 200 mesh, sodium saturated.

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Our Most Popular collection.

A sawn and lacquered slab of classic Precambrian banded layers of hematite (iron) and quartz. Average size: 3" x 4". Ontario, Canada.

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Demonstrates Irregular Breakage

Brazil.

1 pound of black sand packaged in a heat-sealed bag.

Feldspar group; blue-green, microcline, triclinic, ³/₄". Colorado.