3.3" Quartz Crystal Cluster with Calcite & Loellingite -Inner Mongolia

loellingite (or löllingite) is an iron arsenide mineral with the chemical formula FeAs₂. It typically forms in association with arsenopyrite and can be difficult to tell the two apart. The crystals are often twinned and exhibit a silvery metallic luster. It is named after the Lölling mining district in Carinthia, Austria, the site from which it was first described in 1845.

Toxicity Warning: Loellingite contains arsenic and can be harmful if inhaled or swallowed. Most of the risk is long-term, chronic exposure to its dust or fumes. While a crystal sitting on your shelf doesn't pose a health risk you should wash your hands after handling and keep out of reach of children.