👉 Tiemannite is a mineral that is often referred to as "the blue diamond of the Earth." It is composed primarily of calcium carbonate, but it can also contain other minerals like quartz and feldspar. The color of Tiemannite can vary depending on the specific type and location within the mineral, with some specimens appearing to be a deep shade of blue or green. Tiemannite is known for its unique properties such as its high refractive index, which allows it to scatter light in
