rocks usda_mineral_sandstone_93c3955.jpg
TRANSCRIPT
Rocks
http://www.beg.utexas.edu/mainweb/publications/graphics/granite.htm
http://en.wikipedia.org/wiki/File:USDA_Mineral_Sandstone_93c3955.jpg
http://www.gccaz.edu/earthsci/imagearchive/gneiss.htm
Remember theRock Cycle? Lets look in more detail at Rocks
Atoms combine to make compounds that combine to make minerals.
Minerals are
naturally occurring inorganic elements or compounds
having an orderly internal structure
and a characteristic chemical composition,
crystal form and
physical properties
alunite, amethyst, amphibole, analcite, anatase, andalusite, andesine, andradite, anglesite, anhydrite, ankerite, annabergite, anorthite, anthonyite, anthophyllite, anthraconite, anthraxolite, antigorite, apatite, aphrosiderite, apophyllite, aragonite, ardennite, argentoalgodonite, arsenopyrite, asbestos, atacamite, attapulgite, augite,awarurite, axinite, azurite,
babingtonite, baddeleyite, barite, bassetite, bastnaesite, beaconite, beryl, biotite, bismuthinite , blomstrandine, bornite, bowlingite, brannerite, braunite, brochantite, bronzite, brookite, brucite, brunsvigite, buttgenbachite, byssolite, bytownite,
calciovolborthite, calcite, calderite, calumetite, carnallite, carnelian, celadonite, celestite, cerargyrite, chabazite, chalcedony, chalcocite, chalconatronite, chalcopyrite, chalcotrichite, chamosite, chert , chloanthite, chlorargyrite,
chlorastrolite, chlorite, clinochlore, clino-chrysotile, clinozoisite, collophane, columbite, copiapite, copper, coquimbite, cordierite, corrensite, corundum, covellite, crocidolite, cubanite, cummingtonite, cuprite, dahllite, datolite, daubreelite, delessite, diabantite, diallage, diamond, dickite, digenite, dihydrite, diopside, dioptase, djurleite, dolomite, domeykite,
forsterite, francolite, freirinite, fuchsite, fulgurite, galena, garnet, garnierite, gersdorffite, gibbsite, glauconite, goethite, gold, halite, halloysite, halotrichite, harmotome, heterosite, heulandite, hisingerite, hollandite, hornblende,
hyacinth, hydrocarbon, hydrohausmannite, hydromica, hydromuscovite, hydrotroilite, hypersthene, iddingsite, illite, ilmenite, isle royale greenstone, jacksonite, jacobsite, jasper, jaspilite, julgoldite, kamacite, kamiokite, kaolinite,
kearsargeite, keweenawite, kinoite, koutekite, kupfferite, kutnahorite, kyanite, labradorite, langite, laumontite , lavendulan, lead, lechetelierite, ledouxite, leonhardite, lepidocrocite, lepidolite, manganoan siderite, manganocalcite, marcasite,
margarite, marmolite, martite, masonite, maucherite, melaconite, melanochalcite, melanterite, melilite, mercury, mesolite, meta-autunite, metatorbernite, metatyuyamunite, microcline, millerite, minnesotaite, mirabilite, mohawk-algodonite, mohawkite, molybdenite, monazite, montmorillonite, muscovite, nacrite, nantokite, natrojarosite, natrolite, neltnerite,
neotocite, niccolite, nontronite, oligoclase, oligonite, olivenite, olivine, orientite, orthoclase, ottrelite, palygorskite, paragonite, paramelaconite, pararammelsbergite, paratacamite, pargasite, patricianite, paxite, pectolite, pennine, pentlandite, peristerite, perthite, pharmacolite, phengite, phillipsite, phlogopite, phosphides, phosphorite, picrolite,
picropharmacolite, pigeonite, pistacite, pitchblende, plagioclase, plancheite, plessite, polyhalite, posnjakite, powellite, prehnite, priorite, prochlorite, protolithionite, pyrolusite, pyrope, pyrophyllite, pyrostilpnite, pyroxene , pyrrhotite, quartz, rammelsbergite, rauenthalite, rhodochrosite, rhodonite, riebeckite, ripidolite, roscoelite, rubellan, rutherfordine, rutile,
salite, salt, sanidine, saponite, saussurite, scapolite, scheelite, schefferite, schorl, schreibersite, scolectite, seamanite, semi-whitneyite, sericite, serpentine, siderite, silicon, sillimanite, silver, smaltite, smectite, soapstone, specularite,
spessartite, sphalerite, sphene, spinel, spodumene, staurolite, steatite, stellerite, stibiodomeykite, stilbite, stilpnomelane, stinkstone, strontianite, sulfur, sussexite, sylvanite, sylvite, synchisite, szaibelyite, taenite, talc, tantalite, tellurium, tenorite,
tetrahedrite, thomsonite, thuringite, tirodite, titanite, titanomagnetite, topaz, tourmaline, tremolite, trichalcite, tridymite, troilite, tyrolite, uralite, uraninite, uranothorite, uvarovite, vaterite,, vesuvianite, violarite, viridite, vivianite, vladimirite, wairakite, whitneyite, williamsite, wollastonite, wurtzite, xanthosiderite, xonotlite, zeolite, zircon, zoisite, zonochlorite
There are over 3000 types of minerals
Minerals combine to form
Rocks
Some Rocks are made up of just
one mineral - like rock salt (made up of the mineral halite) that is mined near Detroit.
Others Rocks are made up of many minerals - like the
granites and gneisses (made up of feldspars, quartz, and other minerals) found near Marquette.
This slide show is intended to help you understand important types of rocks.
The diagram in the next slide represents the ROCK CYCLE—a scheme that represents the processes of continuous changes that connect the three major groups of rocks:
SEDIMENTARYIGNEOUSMETAMORPHIC
It also shows two other important parts of the “Rock Cycle” – SEDIMENTS and molten LAVA and MAGMA
Here is another version of the Rock Cycle
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1- Igneous Rock 8 -Sedementary Rock 15- Metamorphic Rock
1) IGNEOUS ROCKS
• Form by solidification (crystallization) of melted minerals
• Beneath the surface, MAGMA hardens to form 2) INTRUSIVE rocks with easily visible (COARSE-GRAINED) crystal texture.
• At the surface, LAVA hardens to form 3) EXTRUSIVE rocks with tiny (FINE-GRAINED) crystals or GLASSY (no crystal) TEXTURES
4) Granite
• Light-colored, coarse- grained, no pattern
• Mostly quartz, feldspar, mica, and hornblende
• Often used for buildings and monuments
Intrusive IGNEOUS ROCKS
5) Basalt
• Dark-colored, fine- grained, extrusive
• Formed where lava erupted onto surface
• Most widespread igneous rocks
Extrusive IGNEOUS ROCKS
6) Gabbro
• Dark-colored, coarse- grained intrusive
• Similar composition to basalt—plagioclase feldspar with some pyroxene and olivine
Intrusive IGNEOUS ROCKS
7) Obsidian
• Natural volcanic glass• Forms when lava cools
very quickly• Usually dark, but small
pieces may be clear• Fractures along curved
(conchoidal) surface• Used as spear and
arrow points, knives
Extrusive IGNEOUS ROCKS
Pumice and other igneous rocks
• Light colored, frothy (many air spaces)• Same minerals as in granite, but finer in grain size
IGNEOUS ROCKS
Back to Chart
8) Sedimentary Rocks
Sedimentary rocks may be made of rock fragments—sediments—or by chemical reactions. The classification of sediments is shown below.
9) Clastic rocks–made of cemented sediments—are classified by their grain
sizes.
Sedimentary Rocks
Non-clastic rocks form by 10) chemical precipitation (settling out from a solution.) Limestone is made from calcite, chert from quartz, and halite is rock salt.
Sedimentary Rocks
11)
12) Biologic sedimentary rocks come from the remains of organic
matter.• The most important of
these is coal. Anthracite coal results from the greatest pressure and releases the most energy when burned. Other varieties are bituminous and lignite. “Petrified” (permineralized) wood is another organic rock.
Sedimentary Rocks
13)
More about sedimentary rocks
• 14) Shale is the most common sedimentary rock
• Sedimentary rocks cover about three-quarters of the land surface
Clastic Sedimentary Rocks
Back to Chart
15) Metamorphic Rocks
• Formed by heat and pressure changing existing rocks
• REGIONAL METAMORPHIC affects a large area and results from plate tectonics
• CONTACT METAMORPHISM affects rocks on a local scale, such as “baking” sedimentary rocks next to magma or lava
16) “Foliated” rocks contain much mica and other rocks that produce layering or banding
Gneisses and schists are common in New York City and Westchester.
Metamorphic Rocks
17)
18)
19) Non-foliated metamorphic rocks include marble, which comes from limestone, and
quatzite, which comes from sandstone
Metamorphic Rocks
20)
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Name____________________________ Period____