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Rocks and Minerals A mineral is a naturally occurring inorganic compound with a unique chemical structure and physical properties. A rock is a solid, stony mass composed of a combination of minerals or other organic compounds. For example, quartz and feldspars are minerals, but when formed together, they make a rock, granite” To determine if an Earth rock is a mineral, it should exhibit the following characteristics Naturally occurring Inorganic Can be represented by a chemical formula Crystalline structure Solid Most minerals form by inorganic processes but some, identical in all respects to inorganically formed minerals, are produced by organic processes Transparency describes how well light passes through a mineral sample There are three degrees of transparency: transparent, translucent, and opaque. Habit of a mineral may be define as the size and shape of the crystal, and the structure of form shown by the crystal. 1. Accicular minerals showing needle like crystal. E.g. natrolite 2. Fibrous minerals showing an aggregate of long thin fibers. E.g. Asbestos 3. Tabular minerals showing bladed habit occur as small knife blades. E.g. Kyanite 4. Granular minerals which occur as aggregate of equidimensional grains. E.g. chromites 5. Pisolitic minerals which occur as aggregate of rounded grains of a pea size. E.g. oolite 6. Columnar minerals showing columnar crystal. E.g. tourmaline Minerals strength determines how easy the mineral breaks or deforms when exposed to stress. Reaction with Acid. Some minerals, especially carbonate minerals, react visibly with acid. (Usually, a dilute hydrochloric acid [HCl] is used.) When a drop of dilute hydrochloric acid is placed on calcite, it readily bubbles or effervesces, releasing carbon dioxide
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Rocks and Minerals A mineral is a naturally occurring inorganic compound with a unique chemical structure and physical properties. A rock is a solid, stony mass composed of a combination of minerals or other organic compounds. For example, quartz and feldspars are minerals, but when formed together, they make a rock, granite” To determine if an Earth rock is a mineral, it should exhibit the following characteristics Naturally occurring Inorganic Can be represented by a chemical formula Crystalline structure Solid Most minerals form by inorganic processes but some, identical in all respects to inorganically formed minerals, are produced by organic processes Transparency describes how well light passes through a mineral sample There are three degrees of transparency: transparent, translucent, and opaque. Habit of a mineral may be define as the size and shape of the crystal, and the structure of form shown by the crystal. 1. Accicular minerals showing needle like crystal. E.g. natrolite 2. Fibrous minerals showing an aggregate of long thin fibers. E.g. Asbestos 3. Tabular minerals showing bladed habit occur as small knife blades. E.g. Kyanite 4. Granular minerals which occur as aggregate of equidimensional grains. E.g. chromites 5. Pisolitic minerals which occur as aggregate of rounded grains of a pea size. E.g. oolite 6. Columnar minerals showing columnar crystal. E.g. tourmaline Minerals strength determines how easy the mineral breaks or deforms when exposed to stress. Reaction with Acid. Some minerals, especially carbonate minerals, react visibly with acid. (Usually, a dilute hydrochloric acid [HCl] is used.) When a drop of dilute hydrochloric acid is placed on calcite, it readily bubbles or effervesces, releasing carbon dioxide
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PHYSICAL GEOLOGY Minerals Chapter 3 1 Not counting elements and sub-atomic particles minerals are the basic building block for the majority of earthen materials. Minerals are the major constituent of nearly all rocks. Combinations of minerals (mineral assemblages) in rocks can give insight into the formation and possible alteration of the rocks in question. Identification of minerals is a process of interpreting the physical and other properties of the mineral. In this laboratory assignment you will become familiar with many of the properties of minerals and how to test these properties. Finally by utilizing this data and identification charts you will be able to determine the mineral species. Mineral: Naturally occurring, inorganic, homogenous, solid, element or compound with a characteristic chemical composition and definite crystalline structure. Properties Color: The color of the mineral. Color is not the best property to use to identify minerals. Many minerals occur in multiple colors, impurities in the chemical composition may alter the color. Many different minerals occur in the same colors. Luster: The way in which light is reflected off the minerals surface. Metallic – reflects light like a polished metal (such as gold, silver, lead, bronze, and iron) Submetallic – reflects light like a corroded metal (such as cast iron or rust) Vitreous – reflects light like glass (might not be transparent) Adamantine – reflects light like a diamond Resinous – reflects light like amber Pearly – reflects light like mother-of-pearl Satiny – reflects light like satin or silt cloth, more reflective in one direction Greasy/oily - reflects light like an oil coated substance Waxy - reflects light like a candle or a crayon Dull/earthy – reflects light like dirt or rust Streak Color: The color of the mineral when powdered. Minerals softer than a Mohs hardness of seven can be powdered by rubbing the sample on an unglazed porcelain plate. Minerals with a hardness seven or higher must be crushed. Cleavage: The tendency of some minerals to break along parallel planar surfaces (parting: pseudo cleavage). Habit: The form (shape) the mineral will grow if unimpeded. Acicular – needle like Bladed - like a knife blade Equant – roughly box-like or ball like e.g. cubic, octahedral Mammillary – rounded masses Micaceous – thin sheets Oolitic – small spheres (~1-3mm) Prismatic – elongated with opposite parallel faces Tabular – flat, plate-like Hardness: The minerals resistance to being scratched. In 1812 Friedrich Mohs created a scale using ten common rock forming mineral to compare the differing hardnesses of all minerals. Starting at the softest and proceeding to the hardest. 1. talc 2. gypsum 3. calcite 4. fluorite 5. apatite 6. feldspars 7. quartz 8. topaz 9. corundum 10. diamond. Besides Mohs’ minerals; there.
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