"gel+box"

This paper is coated with an inert, polyethylene film on one side for a complete transfer.

Slaty cleavage; contains hematite.

Light gray, with flow structure.

White, mature, friable.

Precise Determinations of Photoelectric Effect

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

Dive into the colorful world of fluorescent minerals with this all-in-one educational set.

Lustrous, black 'hard coal'.

Light gray, compact, hard, opaque, microcrystalline silica mineral.

Small, rounded pebbles and tightly cemented granules.

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Pure translucent to white, rhombic cleavages, Mohs’ hardness of 3.

Pure, bright yellow, Frasch sulfur.

Pyroxene group; dark green, pure cleaved fragments.

Buff, coarse, crystalline “Austin Marble” with shell casts and molds.