"Ward's Phenomena"

Samples of Intrusive and Extrusive Igneous Rocks

Porphyritic igneous rock containing biotite, feldspar, and hornblende.

Banded volcanic glass.

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Includes: six each of obsidian, pumice, and basalt. Set of 18.

Common rocks and minerals for testing and identification studies are 2–3cm each.

Volcanic glass with snowflakes embedded throughout.

Introduce your students to rocks formed from the cooling of magma and lava.

Glassy; most specimens float in water.

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Study the Formation of Different Igneous Rocks