What is Amethyst? Amethyst is a purple colored mineral that is considered a valuable gemstone. It has a vitreous luster, and [...]

What is Pyrolusite? Pyrolusite is a dark black or grey mineral, but it can sometimes have a tint of blue. It has a streak of [...]

What is Calcite? Calcite is a carbonate mineral, which means it contains a carbonate ion. The chemical formula of calcite is [...]

What is Magnetite? Magnetite is the most common iron oxide mineral. With a chemical formula of Fe3o4, it has the highest [...]

What is Pyrite? Pyrite is an iron sulfide mineral, which means it is a compound of iron and sulfur. It is the most common [...]

What is Microcline Feldspar? Microcline feldspar is a common but little-known mineral. It forms in igneous rocks, and is [...]

What is Gypsum? Gypsum is a soft mineral that is naturally clear, white, gray, yellow, red, or brown. Gypsum’s streak [...]