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Images A-Z Minerals (AA).pdf. A single prismatic allanite-(La) crystal with small, lustrous black magnetite crystals, all on a matrix of hedenbergite.Rocks with minerals in them: epidote-green, feldspar-red, quartz-white. A quartz crystal is a mineral. Some Minerals look like Crystals (but all minerals Over 4,000 minerals have been identified in the scientific literature -. Approximately 40 - 50 new ones are discovered every year! Most minerals are chemically classified as native elements, sulfides, sulfates, oxides, silicates, carbonates, phosphates, halides, nitrates, tungstates, Description of over 600 Minerals from around the world. PETR KORBEL & MILAN NovAK acknowledge all who contributed in any way to the. ❖Tetragonal: Tetragonal crystals are shaped like four-sided pyramids or prisms. The crystal form has three axes that are all perpendicular to one another. Rocks are aggregates of one or more minerals. Fluorite Inorganic - minerals are not formed by anything Framework of tetrahedra sharing all four. All minerals are solids and occur as crystals, and the ordered arrangements of repeating molecules generate the mineral's crystal form.