Monday, March 18, 2019
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Mimetite: More Than An Imitator

By Jim Brace-Thompson Mimetite is a lead arsenate chloride mineral with the chemical formula of Pb5(AsO4)3Cl. In structure and appearance, it can closely resemble pyromorphite,...

Arsenic Family Minerals: Part II — Erythrite, Realgar, Orpiment and Scorodite

Editor's Note: This is the second of a two-part series. Enjoy Part I >>> Story by Bob Jones There’s a large number of minerals whose chemistry...
Kartchner Caverns stalactites

Arizona Underground: Mine Tours, Museums, and Caves

Story and Photos by Bob Jones With winter set to arrive soon, tens of thousands of folks will head into the great Southwest. Quartzsite becomes...
Cuprite, Milpillas Mine

De Colores: Milpillas, Sonora

Editor's Note: This is one of 10 Mexican locales recognized for mineral production. View the rest of the list as part of an article...