"WardsSci000478"
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Ward's Science Essentials® Chert
Clearance
Chert is a microcrystalline, hard, silica mineral.
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Ward's Science Essentials® Scoria
Clearance
Scoria is a dark-colored rock formed from lava with a high gas content.
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Ward's Science Essentials® Obsidian
Clearance
Obsidian is hard black colored, volcanic glass.
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Ward's Science Essentials® Phyllite
Clearance
Phyllite is a light-gray foliated rock formed from metamorphosed slate.
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Ward's Science Essentials® Muscovite
Clearance
Muscovite is a mica mineral cut to demonstrate basal cleavage.
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