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chapter 3 minerals
minerals
Question | Answer |
---|---|
Naturally occurring | Created by nature. |
Inorganic | Cannot be created using any living thing, only NON-living. |
Solid | Minerals have a definite volume, and shape |
Crystal Structure | particles of a mineral lines up in a pattern over and over again |
Definite chemical composition | A mineral has definite chemical makeup of certain elements. |
Mohs hardness scale | Identifies hardness from softest to hardest of ten minerals. |
Color | Easily observed physical property. |
Streak | The color of the minerals powder is easily observed |
Luster | Its reflection of light in the minerals surface. |
Density | How tightly packed the matter is in the mineral. |
Crystal system | The minerals actual polygon shape, example cube, or hexagon. |
Cleavage | Mineral breaks along a flat surface, smooth break. |
Fracture | Mineral breaks in an irregular way, jagged and uneven. |
How Minerals Form | Most minerals form in two ways: through crystallization of melted materials, and through crystallization of materials dissolved in water. |
Crystallization through melted materials | form from magma that cools inside the crust or lava that cools on the surface. Magma cools slowly creating large minerals, and lava cools quickly creating small minerals. |
Minerals in Hot Water Solution | Magma heats water to very high temperatures, when the hot water cools the water and leaves the solution that creates the crystallization. |
Minerals form when solutions evaporate | Where minerals are found: Many rare and valuable minerals are found in or near volcanic activity and mountain building. |
Gemstones | Using minerals such as rubies and sapphires for jewelry |
Metals | Using minerals such as aluminum, iron, copper, and silver, to make other items we use or want. |
Other Useful Minerals | Example: talc= talcum powder |
Ores | a rock that contains metal or useful minerals |
Prospector | someone who looks for ore deposits. |
Mining | Where ore deposits are mined. |
Types of mines | A. Strip mines: Equipment scrapes away the earth's surface to find ores B Open Pit mines:Used when ores or on the earth's surface, but at least 100 meters down. |
C. Shaft mines: are deep in the earth’s surface following the veins of an ore. | D.Smelting: The process that is used after the ore is removed from the mine and the metal is removed from the ore. |