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Conchoidal fracture in obsidian resembles

Weird Words: Conchoidal

By Jim Brace-Thompson Conchoidal is not only a weird geological term, it is also vitally important in terms of developments that led to human survival. In...
Specimen with secondary coating of druze quartz

Manakarra Grape Agate: New Botryoidal Material

Story by Jim Landon In 2016, I started to see Facebook posts of two unique materials that were coming out of Indonesia. One was really...

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