Nuummite is an unapproved trade name for an iridescent ancient metamorphic rock from the Nuuk area of Greenland, dominated by intergrown amphiboles. Learn its geology, authenticity notes, care and modern...
Read more...
Lapis Lazuli is a blue metamorphic rock composed mainly of lazurite-group material with calcite, pyrite, and other minerals. Explore its history, symbolism, and care.
Read more...