This double image is produced as light reflects off the atoms in the mineral's structure, splitting into two rays. Flourite is a mineral that combines calcium and fluoride. It forms crystals shaped like cubes within limestone. Flourite is associated with lead ores and is one of the most popular minerals among collectors. Flourite appears in many colors and is used as flux which lowers the melting point in the manufacturing of steel.
Sources are Mexico, China, Italy, and Illinois.
Fe 2 O 3 Hematite is an iron ore occuring in massive form and has a steel gray to reddish color. Hematite is smooth and non-crystalline. Mostly found in sedimentary rocks, it can also form large replacement deposits. Sources are the United States, Canada, and Brazil. It commonly grows as groups of crystals that form concentric rings, and the bulls eye and ringed patterns in widely varying shades of green make malachite popular among collectors.