Turgite over Quartz - Spain #5 Location_India with a crust of Quartz

with a crust of Quartz grown over the top

Although the technical term would be ironstone concretion

Dickite is a clay mineral that has the same formula as Kaolin and Hallyosite

Bastnasite is named after the Bastnas Mines in Sweden

This sweet specimen is a cluster of clear Topaz crystals

Turgite over Quartz - Spain #5 Location_India with a crust of QuartzThis iridescent Turgite coating over Quartz specimen is from the San Valentin Mine in Spain. You will receive the exact Turgite specimen shown in the pictures. Turgite is a trade name used nowadays to refer to Iridescent varieties of iron oxide minerals, most commonly Goethite or Hematite, that often coat other minerals such as Quartz. As it isn't a single, defined thing, it isn't classified as a mineral, and it's usage had changed over the years,