Rock 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
Slide 2 Learn 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. Slide 3 Rock Review Practice
Test 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
25 Slide 4 1 Slide 5 2 Slide 6 3 Slide 7 4 Slide 8 5 Slide 9 6
Slide 10 7 Slide 11 8 Slide 12 9 Slide 13 10 Slide 14 11 Slide 15
12 Slide 16 13 Slide 17 14 Slide 18 15 Slide 19 16 Slide 20 17
Slide 21 18 Slide 22 19 Slide 23 20 Slide 24 21 Slide 25 22 Slide
26 23 Slide 27 24 Slide 28 25 Slide 29 Gneiss A 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 TestNo Reaction Scratch TestWill
scratch glass Rock TypeMetamorphic Particle Size, Texture Foliated,
Crystalline Mineral Composition Amphibole, Feldspar, Quartz Slide
30 Slide 31 Obsidian Acid TestNo Reaction Scratch TestWill scratch
glass Rock TypeIgneous, 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. Slide 32 Slide
33 Pumice Acid TestNo Reaction Scratch TestWill scratch glass Rock
TypeIgneous, 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 its 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. Slide 34
Slide 35 Conglomerate Acid TestNo Reaction Scratch TestWill scratch
glass Rock TypeSedimentary 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. Slide 36
Slide 37 Garnet Mica Schist Acid TestNo Reaction Scratch TestWill
scratch glass Rock TypeMetamorphic 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. Slide 38 Slide 39 Quartz Sandstone
Acid TestNo Reaction Scratch TestWill scratch glass Rock
TypeSedimentary 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. Slide 40 Slide 41
Fossillferous Limestone Acid TestReacts with Acid Scratch TestWill
not scratch glass Rock TypeSedimentary 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. Slide 42 Slide 43 Quartzite Acid TestNo Reaction Scratch
TestWill scratch glass Rock TypeMetamorphic 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. Slide 44 Slide
45 Granite Acid TestNo Reaction Scratch TestWill scratch glass Rock
TypeIgneous, 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.
Slide 46 Slide 47 Rhyolite Acid TestNo Reaction Scratch TestWill
scratch glass Rock TypeIgneous, 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. Slide 48 Slide 49 Diorite Acid TestNo
Reaction Scratch TestWill scratch glass Rock TypeIgneous, 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. Slide 50 Slide 51 Breccia Acid TestNo Reaction Scratch
TestWill scratch glass Rock TypeSedimentary 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. Slide 52 Slide 53
Shale Acid TestNo Reaction Scratch TestWill not scratch glass Rock
TypeSedimentary 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. Slide 54 Slide 55 Slate Acid TestNo Reaction Scratch
TestWill not scratch glass Rock TypeMetamorphic 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..
Slide 56 Slide 57 Basalt Acid TestNo Reaction Scratch TestWill
scratch glass Rock TypeIgneous, Extrusive Particle Size, Texture
Fine grained Crystalline Mineral Composition Amphibole, pyroxene
Intermediate Feldspar A hard dense igneous rock composed chiefly of
plagioclase, pyroxene And olivine and often having a glassy
appearance. Slide 58 Slide 59 Rock Salt Acid TestNo Reaction
Scratch TestWill not scratch glass Rock Type Chemical 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. Slide 60 Slide 61 Agate Acid TestNo Reaction Scratch
TestWill scratch glass Rock TypeChemical 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. Slide 62 Slide 63 Marble Acid TestReacts with acid
Scratch TestWill scratch glass Rock TypeMetamorphic Particle Size,
Texture Non-foliated Crystalline Mineral Composition Calcite, Trace
Elements A metamorphic rock formed from limestone or dolomite.
Irregular Coloring is often present because of trace elements in
the marble. Marble is often used for sculpting and as a building
material. Slide 64 Slide 65 Mica Schist Acid TestNo Reaction
Scratch TestWill not scratch glass Rock TypeMetamorphic Particle
Size, Texture Foliated Mineral Composition Muscovite, Biotite
Medium to course grained metamorphic rocks composed of laminated
often flaky parallel layers of micaceous rock. Slide 66 Slide 67
Coquina Acid TestReacts with acid Scratch TestWill not scratch
glass Rock TypeSedimentary, 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. Slide 68 Slide 69 Chalk Acid TestReacts with
acid Scratch TestWill not scratch glass Rock TypeSedimentary,
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. Slide 70 Slide 71 Gabbro Acid TestNo Reaction Scratch
TestWill scratch glass Rock TypeIgneous, Intrusive Particle Size,
Texture Course grained, Crystalline Mineral Composition Calcic
plagioclase, pyroxene A course grained igneous rock composed
chiefly of calcic plagioclase and pyroxene Slide 72 Slide 73 Chert
Acid TestNo Reaction Scratch TestWill scratch glass Rock
TypeSedimentary 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. Slide 74 Slide 75 Scoria Acid TestNo Reaction
Scratch TestWill scratch glass Rock TypeIgneous, 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.
Slide 76 Slide 77 Andesite Acid TestNo Reaction Scratch TestWill
scratch glass Rock Type Igneous, 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. Slide 78
