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Definition
An octahedral layer sandwiched between 2 t-o-t structures.
Ex. Chlorite group |
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Definition
An octahedral layer sandwiched between 2 tetrahedral layers
Ex. muscovite, vermiculite |
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Term
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Definition
A singler tetrahedral sheet bonded to a single octahedral sheet.
Ex. kaolinite |
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Definition
| Min compounds characterized by a haolgen sucha as F, Cl, or I as an ion. |
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Definition
| Group of mins w/ formulas characterized by (CO3)2- radicals. |
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Definition
| the degree to which unstable minerals have been removed from detritus by chem. weathering. |
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Definition
| measure of grain size, sort & roundness |
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Definition
| primarily composed of sandsized particles |
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Definition
| any rock or min that can be extracted & sold for a profit |
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Term
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Definition
| amount of ore in a deposit |
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Term
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Definition
| concentration of commodity in an ore |
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Definition
| ore mins scattered evenly throughout host rock. |
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Term
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Definition
| ore mins occur in many small veins throughout host rock |
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Term
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Definition
| occurs in closely spaced veins |
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Term
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Definition
| ore associated w/ fluids that are active during contact metamorphism reactions btwn dissolved ions in aqueous fluids given off by intrusions w/ ions in country rock. |
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Term
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Definition
sandstone containing lg. amounts of clay, rock frags or any other material w/ quartz.
"dirty sandstone" |
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Term
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Definition
| rocks formed by compaction & cementation of clast fragments of prexisting rock. |
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Term
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Definition
| a type of weathering reaction that simultaneiously produces dissolved material & secondary minerals. |
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Term
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Definition
| transformation of deposited sediment into lithified rock. Includes chemical and biological processes |
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Term
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Definition
| the process of an atom losing one or more electrons through chemical reaction |
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Term
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Definition
| occurs when groundwater selectively dissolves ions in host rock, resulting in net concentration of ore mins. in "residue" host rock. |
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Term
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Definition
| hydrothermal ore deposit whose formation is not associated w/ an igneous intrusion |
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Term
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Definition
| when light passes into a crystal, the phase velocity decreases according to the crystals electron density. |
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Term
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Definition
| Allows only N-S vibrating component to pass==resolves 2 rays into 1 ray. |
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Term
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Definition
| numerical difference between the max RI & min RI |
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Term
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Definition
| preferential absorption of visable light wavelengths according to crystal orientation. --when you rotate the stage it will change the hue. |
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Term
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Definition
"banded"===layers in host rock mostly in precambrian rock
Fe oxides
Fe carbonates
Fe silicate |
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Term
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Definition
| birefringent mineral grain that appears "dark" when viewed under crossed polars. |
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Term
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Definition
mins have 2 optic axes
orthorhombic
monoclinic
triclinic |
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Term
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Definition
mins have 1 optic axis
hexaganol
tetraganol |
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Term
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Definition
| the direction along which the light vibrates in a crystal |
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Definition
| light passed through polarizer. |
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Term
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Definition
| allows light to pass vibrating in an E-W direction |
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