Saturday, April 20, 2019
Home Tags Volcanic rock

Tag: volcanic rock

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...