watermelon tourmaline on black background

Watermelon Tourmaline Field Guide

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ant-hill-garnets

Ant Hill Garnets: Tiny Miner Treasures

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native silver from Kongsberg/ Norway isolated on white background

Spectacular Native Silver: Rarer Than Gold

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Halite Mineral: Pass the Salt!

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grape-agate

Grape Agate: A Food Look-Alike Mineral

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wisconsin-geological-society-history

Wisconsin Geological Society: Saving History

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st. michaelis tourist mine in clausnitz, germany allows visits to an erzgebirge mine as described by georgius agricola

Georgius Agricola & De Re Metallica (Part II)

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georgius agricola the author of de re metallica

What is De Re Metallica By Georgius Agricola? (Part I)

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Kokoweef Cave Onyx: What to Cut

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flowering tube onyx

Flowering Tube Onyx: What to Cut

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