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* Internet Search Results    *** Search Filter: "Minerals"    Mineral Properties, Photos, Uses and Descriptions - Geology.com What Are Minerals? Minerals are materials that meet five requirements. They are: 1) naturally occurring, 2) inorganic, 3) solids, 4) with a definite chemical composition, and, 5) an ordered internal structure. What are Minerals? | What are Mineral Properties? - Geology.com There are approximately 4000 different minerals, and each of those minerals has a unique set of physical properties. These include: color, streak , hardness , luster , diaphaneity, specific gravity, cleavage, fracture, magnetism, solubility, and many more. Mohs Hardness Scale: Testing the Resistance to Being Scratched The Mohs Hardness Scale is a set of ten reference minerals (numbered 1 through 10) that are used to determine the relative hardness of minerals and other objects. In this test the hardness of a mineral is defined as its "resistance to being scratched". Crystal Habits and Forms of Minerals and Gems - Geology.com Minerals: Information about ore minerals, gem materials and rock-forming minerals. Volcanoes: Articles about volcanoes, volcanic hazards and eruptions past and present. Gemstones: Colorful images and articles about diamonds and colored stones. Geology and Earth Science News, Articles, Photos, Maps and More Geology.com is one of the world's leading portals to geology and Earth science news and information for rocks, minerals, gemstones, energy, volcanoes, earthquakes, careers, geologic hazards, and more. Muscovite Mineral | Uses and Properties - Geology.com The heat and pressure of metamorphism transforms clay minerals into tiny grains of mica which enlarge as metamorphism progresses. Muscovite can occur as isolated grains in schist and gneiss , or it can be abundant enough that the rocks are called "mica schist" or "micaceous gneiss." Luster: The light-reflecting qualities of a mineral. - Geology.com The photographs and descriptions on this page illustrate some of the most common lusters observed in minerals. Gypsum Mineral | Uses and Properties - Geology.com The best way to learn about minerals is to study with a collection of small specimens that you can handle, examine, and observe their properties. Inexpensive mineral collections are available in the Geology.com Store . Topaz | Uses and Properties of the Mineral and Gem - Geology.com Topaz is one of the Mohs hardness minerals and has been an important gemstone for thousands of years. It occurs in a wide range of colors, many of which are produced by treatments. Granite: Igneous Rock - Pictures, Definition & More - Geology.com Granite is the most widely known igneous rock. It is an intrusive rock with visible grains of feldspar, quartz, mica, and amphibole minerals. 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