obsidian

Obsidian 101: Formation and Types

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road sign for the rock cafe oklahoma

Rockhounding the Rock Cafe, Oklahoma

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Quartz Varieties & Forms: On the Rocks

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tumbled snowflake obsidian with snowflakes that are silicon dioxide polymorph cristobalite

What is Silicon Dioxide? More Than Quartz

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Quartzsite town sign

Quartzsite, Arizona: The Hunt for Rocks & History

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selection of geodes from the geode guys

The Geode Guys: A Passion for Geodes

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geodes

Las Choyas Geodes 101

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Keokuk Geodes & Pseudocubic Quartz

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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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