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AnswerKeys
Use your InteractiveRock Identification tofill in the chart!Interactive Rock Identification chart answer keyInteractive Rock IdentificationScratchesFizzes withHClTextureGrain SizeMineralsCrystallineClasticGlassyOther (be specific)CoarseMediumFineMixture of grain sizesLightDarkLight and DarkYes / Noif yes, Thick or Thin?Yes / No /did not testA lotA littleNo Fizz/ did not test1CrystallineCoarseLight and SedimentaryName ofRockDid not testIgneousGraniteYesDid not testIgneousGabbroNoYesDid not testIgneousRhyoliteDarkNoYesDid not testIgneousBasalthas gas bubblesLightNoDid not testDid not testIgneousPumiceGlassyNo Crystal grainsDarkNoDid not testDid not testIgneousObsidian7ClasticFine(usually darker color)variety of colorYes (thick)Did not testDid not testSedimentaryShale8ClasticMediumvariety of colorNoDid not testDid not testSedimentarySandstone9ClasticMixture of grain sizesvariety of colorNoDid not testDid not testSedimentaryConglomerate10ClasticMixture of grain sizesvariety of colorNoDid not testDid not testSedimentaryBreccia11ClasticFine(usually lighter color)NoNoA LotSedimentaryLimestoneOther (made fromFine(usually lighter color)variety of colorNoNoA LittleSedimentaryDolomiteCrystallineFine(usually lighter color)variety of colorNoYesNoSedimentaryChertOther (made fromFineUsually gray to blackNoNoYesSedimentaryCoalCrystallineFine(usually darker color)variety of colorYes (thin)Did not testDid not testMetamorphicSlate16CrystallineCoarseLight and DarkYes (thin)YesDid not testMetamorphicGneiss17CrystallineMedium to eMedium to CoarseLightNoNoA LittleMetamorphicMarble19CrystallineDid not testDid not testMetamorphicSchistSample12131415dissolved minerals)(microcrystalline)organic material)(microcrystalline)(rounded particles)(angular particles)Fine to Medium grained(crumbles easily)variety of color(rubs off on paper)variety of colorLayers(not this sample)Foliated Layers(brittle, wavy layers)GlassWill this rock burn?(pick one)
Interactive Rock Identification Chart: QUESTIONSANSWER KEY1. Most Igneous Rocks have atexture.a) Crystallineb) Clasticc) Glassyd) Other (made from dissolved minerals or organic material)2. Igneous rocks with a coarse grain size area) Intrusive (cooled from magma)b) Extrusive (cooled from lava)3. The main difference between Granite and Gabbro isa) Granite is coarse grained while Gabbro is fine grainedb) Granite contains more quartz and other light colored mineralsc) Granite will scratch glass while Gabbro will not scratch glassd) Granite has a crystalline texture while Gabbro is glassy4. Which of these rocks contains the same minerals as Granite?a) Pumice and Basaltb) Basalt and Gabbroc) Gabbro and Obsidiand) Obsidian and Pumice5. For which type of rock is color the least helpful in identifying?a) Igneousb) Sedimentaryc) Metamorphic6. Why didn’t we test some samples (like sandstone andconglomerate) to see if they would scratch glass?a) They can be made up of particles of varying hardnessb) They would just crumblec) Everyone knows they will scratch glassd) We ran out of “digital” glass plates7. Limestone, Dolomite, and Marble all contain somea) Silicon Dioxideb) Carbonate mineralsc) Crystalsd) Fossils8. A rock formed form quartz sandstone or chert that was changedby extreme heat and pressure isa) Limestoneb) Slatec) Gneissd) Quartzite9. When “poorly sorted” sediments are deposited quickly (not farfrom their source) and cemented together, they form the rocka) Sandstoneb) Shalec) Conglomerated) Breccia10. A rock with light and dark colored minerals that cooled quicklyfrom lava containing a lot of trapped gasses isa) Basaltb) Obsidianc) Gabbrod) Pumice11. When Granite is changed by extreme heat and pressure itbecomesa) Gneissb) Obsidianc) Marbled) Basalt12. What is your favorite rock? answers varyWhy? answers vary
Mystery Rock Lab w/cluesMysterySampleImageANSWER KEYRock NameMysterySampleImageRock NameMysterySampleImageRock Granite14Gneiss
Mystery Rock Lab without cluesANSWER KEYUse this table to make an answer key for yourown classroom samplesMystery SampleRock NameNotesMystery Sample11121231341451561671781891910Rock NameNotes
Interactive Rock Identification chart answer key. 1. Most Igneous Rocks have a texture. a) Crystalline b) Clastic c) Glassy d) Other (made from dissolved minerals or organic material) 2. Igneous rocks with a coarse grain size are a) Intrusive (cooled from magma) b) Extrusive (cooled from lava) 3. The main difference between Granite and Gabbro is a) Granite is coarse grained while Gabbro is .
