classification of rocks test for student 1
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rocksTRANSCRIPT
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Igneous Rock ClassificationFelsicIntermediateMaficUltramafic
Aphanitic(fine grain)RhyoliteAndesiteBasaltConditions needed to produce ultramafic flows do not exist in nature at this time.
IntermediateDaciteDiabase
Phaneritic(coarse grain)GraniteDioriteGabbroPeridotite
GlassyObsidian
FrothyPumiceScoria
Clastic Sedimentary Rocks Classification
Name of Rock Sediment Type Texture
Conglomerategravel - rounded fragments Course over 2 mm
Brecciagravel - angular fragments Course over 2 mm
SandstonesandMedium 1/16 to 2mm
SiltstonemudFine 1/256 to 1/16 mm
Shalemudvery fine less than 1/256 mm
Metamorphic Rocks Classification
Name of Rock Parent Rock TextureGrain Size Notes
SlateShale, mudstone, siltstone Foliatedvery finesmooth dull surfaces
PhylliteSlatefineglossy sheen
SchistPhyllitemedium to course micaceous minerals
GneissShist, granite, volcanic rocks medium to coursemineral banding
MarblelimestoneNonfoliatedmedium to courseInterlocking calcite or dolomite grains
Quartzitequartz sandstone medium to coursefused quartz grains
Anthracitebituminous coal fineblack, shiny, organic rock
CLASSIFICATION CHARTMetamorphic RocksMINERAL CONTENT - Examples of minerals that you might findROCK NAMEPROTOLITH (Original Rock)
---- T E X T U R E -------- F O L I A T E D ----NOT BANDEDAPHANITICVery fine-grained, SLATY texture, produces flat fragmentsMINERALS TOO SMALL TO SEESLATEShale Siltstone
Fine-grained, PHYLLITIC texture, surfaces have satiny sheen, with crenulations (small wrinkles)PHYLLITE
May appear grainyGREENSTONE (Metabasalt)Basalt
PHANERITICMedium- to coarse-grained, SCHISTOSE textureMUSCOVITE BIOTITE CHLORITE HORNBLENDE Quartz, Feldspar Garnet, Epidote Staurolite kyanite, etc.SCHISTShale Siltstone Sandstone Basalt
MAY BE BANDEDCoarse-grained, with pebbles preserved from original sedimentary rockQuartz, Feldspar Muscovite ChloriteMETA- CONGLOMERATEConglomerate
Medium- to coarse-grained with large crystals of some minerals (e.g., garnet, staurolite)Quartz, Feldspar Muscovite Biotite ChloritePORPHYROBLASTIC SCHISTSandstone Granite or other Igneous Rock
BANDEDMedium- to coarse-grained, GNEISSOSE textureQuartz, Feldspar Biotite Hornblende Muscovite ChloriteGNEISS
N O T F O L I A T E DPHANERITICCoarse-grained, with pebbles preserved from original sedimentary rockQuartz, Feldspar Muscovite ChloriteMETA- CONGLOMERATEConglomerate
APHANITIC OR PHANERITICFine- to coarse-grained, GRANOBLASTIC textureQUARTZQUARTZITEQuartz Arenite
CALCITE DOLOMITEMARBLELimestone Dolostone
APHINITICMay appear grainyMINERALS TOO SMALL TO SEEGREENSTONE (Metabasalt)Basalt
CLASSIFICATION CHARTIgneous Rocks-- MINERAL COMPOSITION
K-FELDSPAR QUARTZ +/- plagioclase biotite muscoviteNa-rich PLAGIOCLASE HORNBLENDE +/- biotite quartz augiteCa-rich PLAGIOCLASE AUGITE +/- olivine hornblendePYROXENE(S) OLIVINEOLIVINE
ROCK NAME
---- T E X T U R E -----Phaneritic (Plutonic)grains < 3 cmGRANITEDIORITEGABBROPERIDOTITE---DUNITE---
grains > 3cmPEGMATITIC GRANITErare or unknownrare or unknownrare or unknownrare or unknown
Aphanitic (volcanic)RHYOLITEANDESITEBASALTrare or unknownrare or unknown
Porphyritic (volcanic)PORPHYRITIC RHYOLITEPORPHYRITIC ANDESITEPORPHYRITIC BASALTrare or unknownrare or unknown
Glassy (volcanic)OBSIDIANrare or unknownrare or unknownrare or unknownrare or unknown
Vesicular (volcanic)PUMICE (small vesicles)rare or unknownVESICULAR BASALT (Scoria)rare or unknownrare or unknown
COLORLight Shades or red, except obsidian which is usually blackIntermediate ShadesDark-shades of green, to nearly blackLight to Intermediate green