rock identification
DESCRIPTION
Rock Identification. Click Here to take a practice Rock ID Test. Click Here to Learn more about a specific rock. Learn Your Rocks. Rock ID Practice Test. Quartz Sandstone. Obsidian. Garnet Mica Schist. http://www.mlms.logan.k12.ut.us/~mlowe/PowerPoints/RockIDPracticeA.ppt. - PowerPoint PPT PresentationTRANSCRIPT
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Rock IdentificationRock Identification
Learn Your Rocks
Rock ID Practice Test
Click Here to Learn more
about a specific rock.
Click Here to take a
practice Rock ID Test
Quartz Sandstone
Garnet Mica Schist
Obsidian
http://www.mlms.logan.k12.ut.us/~mlowe/PowerPoints/RockIDPracticeA.ppt
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Learn Your RocksLearn Your Rocks
Gneiss
Obsidian
Pumice
Slate
Mica Schist
Conglomerate
Garnet Mica Schist
Quartz Sandstone
Fossillferous Limestone
Quartzite
Granite
Rhyolite
Diorite
Breccia
Shale
Basalt
Rock Salt
Agate
Marble
Coquina
Gabbro
Chert
Scoria
Andisite
Chalk
Select a rock to learn more about it.
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Rock Review Practice Test
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GneissGneissA banded or foliated rock usually made from some type of
granite. Color will vary considerably based on the amount and kind of minerals found in the original granitic rock.
Acid Test No Reaction
Scratch Test Will scratch glass
Rock Type Metamorphic
Particle Size, Texture Foliated, Crystalline
Mineral Composition
Amphibole, Feldspar, Quartz
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ObsidianObsidian
Acid Test No Reaction
Scratch Test Will scratch glass
Rock Type Igneous, Extrusive
Particle Size, Texture
Compact Glassy
Mineral Composition
Silica Rich
A black, banded, or spotted hard volcanic glass that is formed by very rapid cooling of lava. Historically, many different peoples have used the glass rock to fashion sharp tools such as knives and spear points.
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PumicePumice
Acid Test No Reaction
Scratch Test Will scratch glass
Rock Type Igneous, Extrusive
Particle Size, Texture
Compact, Fibrous, Glassy
Mineral Composition
Silica Rich
A light, porous, fibrous, glassy lava, used in solid form as an abrasive and in powdered form as a polish and an abrasive. Sometimes it’s
density is low enough that it will float in water. Pumice is lava that had a lot of gases in it and cooled quickly on the surface of the earth.
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ConglomerateConglomerate
Acid Test No Reaction
Scratch Test Will scratch glass
Rock Type Sedimentary
Particle Size, Texture
Gravel and smaller sized particles
Mineral Composition
Varied, heterogeneous mixture
A rock consisting of heterogeneous pebbles and gravel embeded in a cement made of clay, silt and sand particles.
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Garnet Mica SchistGarnet Mica Schist
Acid Test No Reaction
Scratch Test Will scratch glass
Rock Type Metamorphic
Particle Size, Texture
Leaf like foliation
Mineral Composition
Muscovite and Garnet
A mica rich leafed foliated rock that is formed under great heat and pressure. Garnet crystals have developed on the rock as it was being formed. The rock may be silvery white to various shades of grey and
exhibit yellow to brown tones depending on the oxidation of the various minerals in the rock sample.
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Quartz SandstoneQuartz Sandstone
Acid Test No Reaction
Scratch Test Will scratch glass
Rock Type Sedimentary
Particle Size, Texture
Sand size, crystalline
Mineral Composition
Quartz
A rock formed by the consolidation and compaction of generally rounded sand particles cemented together by clay, silt, or silica
particles. The color will vary based on the trace elements present in the quartz sand particles. The rock may show color
banding and cross-bedding patterns.
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Fossillferous LimestoneFossillferous Limestone
Acid Test Reacts with Acid
Scratch Test Will not scratch glass
Rock Type Sedimentary
Particle Size, Texture
Sand size, smooth
Mineral Composition
Calcite
A common sedimentary rock consisting mostly of calcium carbonate which contains fossils of various fresh and or salt
water shell fish. It is used as a building stone, and in the manufacture of lime, carbon dioxide, and cement.
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QuartziteQuartzite
Acid Test No Reaction
Scratch Test Will scratch glass
Rock Type Metamorphic
Particle Size, Texture
Non-foliated, Crystalline
Mineral Composition
Quartz
A rock formed by the metamorphism of quartz sandstone. Quartz is a very hard mineral composed of silica. Quartzite can be a wide variety of colors depending on what elements are present in small amounts.
Quartzite is very prevalent and is found worldwide.
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GraniteGranite
Acid Test No Reaction
Scratch Test Will scratch glass
Rock Type Igneous, Intrusive
Particle Size, Texture
Course grained, Crystalline
Mineral Composition
Quartz, Potassium Feldspar
A common hard igneous rock consisting mostly of quartz, orthoclase or microcline, and mica. Granite is used for building and paving.
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RhyoliteRhyolite
Acid Test No Reaction
Scratch Test Will scratch glass
Rock Type Igneous, Extrusive
Particle Size, Texture
Fine grained
Mineral Composition
Light color indicates a felsic composition
A volcanic rock similar to granite in composite that cooled much more rapidly than granite that usually exhibits flow lines. Color may vary.
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DioriteDiorite
Acid Test No Reaction
Scratch Test Will scratch glass
Rock Type Igneous, Intrusive
Particle Size, Texture
Course grained Crystalline
Mineral Composition
Amphibole, Intermediate Feldspar
Any of various intermediate to dark granite textured crystalline rocks rich in plagioclase.
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BrecciaBreccia
Acid Test No Reaction
Scratch Test Will scratch glass
Rock Type Sedimentary
Particle Size, Texture
Gravel size to smaller angular broken rock
Mineral Composition
Large variety
Rock composed of sharp angled fragments embedded in a fine grained matrix of sand, silt, and clay particles. The sharp edged rock
generally are from a talus slope.
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ShaleShale
Acid Test No Reaction
Scratch Test Will not scratch glass
Rock Type Sedimentary
Particle Size, Texture
Clay sized particles
Mineral Composition
Clay minerals
A rock composed of fine grained layers of sediment. Shale is often embedded with Fossils of plant and animal material.
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SlateSlate
Acid Test No Reaction
Scratch Test Will not scratch glass
Rock Type Metamorphic
Particle Size, Texture Foliated, fairly smooth
Mineral Composition
Clay minerals
A fine grained, grayish metamorphic rock that splits into smooth surfaced layers. It has been used for blackboards, roofing material and paving stones. It is generally made of metamorphosed shale. .
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BasaltBasalt
Acid Test No Reaction
Scratch Test Will scratch glass
Rock Type Igneous, Extrusive
Particle Size, Texture
Fine grained Crystalline
Mineral Composition
Amphibole, pyroxene Intermediate Feldspar
A hard dense igneous rock composed chiefly of plagioclase, pyroxeneAnd olivine and often having a glassy appearance.
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Rock SaltRock Salt
Acid Test No Reaction
Scratch Test Will not scratch glass
Rock TypeChemical Sedimentary, Evaporite
Particle Size, Texture
Solid mass of inter-grown crystals.
Mineral Composition
Halite, trace minerals
A rock containing mostly halite, table salt, as its main constituent.The color of the rock salt can vary depending on the trace mineral present In the sample. This is an evaporite in that it is the salt left
after the salt has evaporated from saltwater. It is very tasty.
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AgateAgate
Acid Test No Reaction
Scratch Test Will scratch glass
Rock Type Chemical Sedimentary
Particle Size, Texture
Micro-crystalline
Mineral Composition
Quartz, Trace minerals
A fine grained variety of quartz with colored banding. The colored banding results from the presence of various trace elements.
Agates have been cut and polished to use for jewelry for some time.
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MarbleMarble
Acid Test Reacts with acid
Scratch Test Will scratch glass
Rock Type Metamorphic
Particle Size, Texture
Non-foliated Crystalline
Mineral Composition
Calcite, Trace Elements
A metamorphic rock formed from limestone or dolomite. IrregularColoring is often present because of trace elements in the marble.
Marble is often used for sculpting and as a building material.
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Mica SchistMica Schist
Acid Test No Reaction
Scratch Test Will not scratch glass
Rock Type Metamorphic
Particle Size, Texture Foliated
Mineral Composition
Muscovite, Biotite
Medium to course grained metamorphic rocks composed of laminated often flaky parallel layers of micaceous rock.
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CoquinaCoquina
Acid Test Reacts with acid
Scratch Test Will not scratch glass
Rock Type Sedimentary, Organic
Particle Size, Texture
Gravel size and smaller shell material
Mineral Composition
Calcite, Calcium Carbonate
Cream to pale brown, porous, poorly cemented organic limestone composed of marine or
freshwater mollusk shells and shell fragments.
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ChalkChalk
Acid Test Reacts with acid
Scratch Test Will not scratch glass
Rock Type Sedimentary, Organic
Particle Size, Texture
Fine particles, very soft
Mineral Composition
Calcium Carbonate, Calcite, Trace minerals
A soft compact calcite with varying amounts of quartz, silica, feldspar,
and other mineral impurities. Chalk is generally grey-white to yellow-
White in color. It is derived chiefly from fossil sea shells.
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GabbroGabbro
Acid Test No Reaction
Scratch Test Will scratch glass
Rock Type Igneous, Intrusive
Particle Size, Texture
Course grained, Crystalline
Mineral Composition
Calcic plagioclase, pyroxene
A course grained igneous rock composed chiefly of calcic plagioclase and pyroxene
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ChertChert
Acid Test No Reaction
Scratch Test Will scratch glass
Rock Type Sedimentary
Particle Size, Texture
Dense & smooth Fine Particles
Mineral Composition
Chalcedonic, opaline silica, color varies
A siliceous rock of chalcedonic or opaline silica occurring in limestone. Color may vary considerably. White to grey to black sample will probably be flint. Yellow green brown
and red will probably be Jasper.
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ScoriaScoria
Acid Test No Reaction
Scratch Test Will scratch glass
Rock Type Igneous, Extrusive
Particle Size, Texture
Rough grained, fine crystalline
Mineral Composition
Plagioclase feldspar, pyroxine
A volcanic rock having vesicular structure due to the gases that are moving through the lava as it cools and solidifies. Scoria has basaltic composition. It can vary in color from
dark grey to black or dark brown to reddish rust.
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AndesiteAndesite
Acid Test No Reaction
Scratch Test Will scratch glass
Rock TypeIgneous, Extrusive or Dikes & sills Intrusive
Particle Size, Texture
Fine grained, Crystalline
Mineral Composition
Plagioclase, Feldspar, amphibole, Pyroxene, Biotite
A A white to grey igneous rock that usually forms on the surface in lava flows (extrusive) or sometimes as dikes and
sills (intrusive) under.
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