Photos and information about 80 common rock-forming, ore and gemstone minerals from around the world.

Home » Minerals » What is a Mineral? What are Minerals? Minerals are the foundation of the construction, manufacturing and agricultural industries. Article by: Hobart M. King, PhD Mineral …

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Biotite is a name used for a large group of black mica minerals that are commonly found in igneous and metamorphic rocks. These include annite, phlogopite, siderophyllite, fluorophlogopite, fluorannite, …

Home » Metals » REE - Rare Earth Elements REE - Rare Earth Elements and their Uses The demand for rare earth elements has grown rapidly, but their occurrence in minable deposits is limited. Article …

Rhodochrosite is a pink to red manganese carbonate mineral that has been used as a beautiful gemstone, an ore of manganese, and when in fine transparent crystals its value as a mineral …

Luster is a physical property that can be helpful in mineral and gem identification. It can also determine how a mineral or gem can be used.

Home » Minerals » Magnetite Magnetite and Lodestone The primary ore of iron, a mineral used in heavy media separation, and a recorder of Earth magnetism Article by: Hobart M. King, PhD Magnetite: A …

Home » Minerals » Quartz Quartz A ubiquitous mineral with an enormous number of uses Article by: Hobart M. King, PhD Quartz crystals: Herkimer "Diamond" quartz crystals. A clear, "rock crystal" …

Galena is a lead sulfide mineral. It is the world's most important ore of lead and a significant ore of silver.