Phenocrysts of feldspar and horneblende can be found in the porphyritic variety. The equigranular and porphyritic varieties may vary in texture between each other within a few centimetres. A foliated appearance can develop from the roughly parallel alignment of the minerals. The rock has an intermediate composition between plagioclase feldspar (oligoclase or andesine) and amphibole (usually hornblende) with various other minor minerals like pyroxene‚ biotite. Quartz and alkali feldspar may also be
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CHAPTER ONE 1.0Introduction Basement and crystalline basement rock are used to define the rocks below a sedimentary platform or cover‚ or more generally any rock below sedimentary rocks or sedimentary basins that are metamorphic or igneous in origin. In the same way the sediments and/or sedimentary rocks on top of the basement can be called a cover or sedimentary cover. The basement complex may as known consists of various rock types including granites‚ granodiorites‚ charnockites‚ syenites
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GENERAL GEOLOGY - GEOL 1113 EXAM I WITH ANSWERS - Spring 2002 Below you will find the questions and answers for Exam I in my General Geology class. The correct answer for each question is highlighted in bold face green type. While you are reviewing the exam‚ pause at the questions you find you missed and try to understand why you missed them. Really understanding this will require not only that you understand why your answer is incorrect‚ but also why you chose it in the first place. Were you confused
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your percentage of certainty: What was confusing about this mineral? What other minerals do you think it could be? Remember‚ the minerals in the virtual lab include seven of the following: borax‚ calcite‚ corundum‚ graphite‚ gypsum‚ orthoclase feldspar‚ pyrite‚ quartz‚ talc‚ and topaz. Identification of Mineral Percent Certain Explanation of Certainty Example: Fluorite 80% certain I am almost certain this mineral is fluorite‚ but I am not completely sure. Fluorite and gypsum are both white
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determined the matrix to be feldspar rich. Because it is feldspar rich‚ it can be surmised that it is compositionally fairly immature. These two characters lead us to interpret this depositional environment as a braided river system. Braided rivers systems are capable of a high bed load of sediments‚ high flow energy‚ and still not too far from the
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beach to Newport Beach. In Newport beach the primary minerals pertain to be quartz‚ feldspar‚ magnetite‚ and shell fragments (biogenous). Thus‚ Newport Beach’s main minerals are due to the fact that sediments mainly come from the mountains‚ rivers‚ and blown dust. Terrigenous sediments that are from mountains have granite‚ and the mineral in granite is quartz‚ and rivers must drain minerals like magnetite and feldspar(possible biogenous) to the beach. Also‚ beaches in the Louisiana differentiate from
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__________________________________ Last Name First Name PRINT GEOL 1330‚ - Dr. Lapen _______________________________ Signature Exam I February 20‚ 2012 Multiple Choice (1 point each) Questions 1-6 refer to the figure below: #2 #3 #4 1) What type of plate boundary is depicted? a) b) c) d) e) convergent subduction transform divergent volcanic 2) What component of the plate boundary is represented here? a) b) c) d) e) continental crust melting
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TERMS AGATE: an ornamental stone consisting of a hard variety of chalcedony‚ typically banded in appearance. AGENTS OF METAMORPHISM: heat‚ pressure‚ chemicals AGENTS OF TRANSPORTATION: wind‚ ice‚ water AMPHIBOLE: any of a class of rock-forming silicate or aluminosilicate minerals typically occurring as fibrous or columnar crystals. ANDESITE: a dark‚ fine-grained‚ brown or grayish volcanic rock that is intermediate in composition between rhyolite and basalt. ANTHRACITE: coal of a hard
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73% certain | I am about 73% suree it this is Calcite. However this does show similarities with Gypsum‚ Quartz‚ Borax. | Mineral 4: Orthoclase Feldspar | 96% certain | I’m 96% sure this is Orthoclase Feldspar because of the qualification it meets for Orthoclase Feldspar.
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under the conditions involving intense heat. Intrusive: Igneous rock that forms beneath Earth’s surface. Extrusive: Igneous rock that forms at the Earth Surface. Felsic: Igneous rock rich in potassium feldspar and quartz and light color. Mafic: Igneous rocks that are rich in dark Plagioclase feldspar‚ pyroxene and that are dark in their color. Lava: Magma that reaches Earth surface. Texture: The feel of a rock due to its size‚ shape and its arrangement of mineral crystal or sediment in a rock.
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