Black Mica 10mm Round A Grade - 15-16 Inch 1.7mm Amber is a yellow

Amber is a yellow

Lemurian Aquatine Calcite is also known as Blue Argentinian Calcite

which may form green stains or specks on Azurite crystals or aggregates

Viking explorers used thin pieces of Iolite as the world’s first polarizing lens to help them determine the exact location of the sun for navigation

currently believed to be due to the presence of a copper-based mineral such as Malachite or Azurite

Black Mica 10mm Round A Grade - 15-16 Inch 1.7mm Amber is a yellowMica is a mineral name given to a group of minerals that are physically and chemically similar. They are all silicate minerals, known as sheet silicates because they form in distinct layers. Micas are fairly light and relatively soft, and the sheets and flakes of mica are flexible. Mica is heat resistant and does not conduct electricity. There are 37 different mica minerals. The most common include: purple lepidolite, black biotite, brown phlogopite