Manganese node

Entries

1. Entry 1

   Paleolithic artists at Lascaux and Ekain ground pyrolusite and romanechite into black pigments, creating cave paintings that have endured roughly 17,000 years.

2. Entry 2

   Colorado's Sweet Home Mine near Alma produced the world's finest rhodochrosite crystal, the "Alma King," prompting Colorado to designate rhodochrosite as its official state mineral in 2002.

3. Entry 3

   Ancient Romans used pyrolusite as "glassmakers' soap" - small amounts oxidized iron impurities and removed the greenish tint from molten glass, producing clear colorless vessels.

Tasks that unlock the entries