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16 Cards in this Set

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Sulfur
yellow, fairly soft, rotten egg smell, used to make rubber and chemicals
Graphite
dark grey, used in pencils, comes off on your hands
Limestone
sedimentary rock that later can into marble, tan and pink
Shale
black, hard oil base, shal can turn into slate, when wet it can smell like mud, clay sediments settle in quiet lakes, lagoons bays, or off-shore areas. They're buried and copacted and the clays become shale, iron oxides often help to cement the particles together
Sandstone
sedimentary tan, sandy color feels like sandpaper, can be red, yellow, green or white, has some layers so it looks like a sandwich
Granite -
pink, grey and black and all different colors, used in counter tops, forms deep in the earth's crust from cooling magma that contains a lot of quartz, slow cooling produces the large crystals in granite
Pumice
very light gray to medium gray, rough, light it often floats, it contains a large number of gas bubbles, each surrounded by a thin layer of volcanic glass, looks something like a sponge, is explosively blown out of volcanoes, tThe gases that are trappped in the bubbles are in the same that cause the explosive eruption. It is the same kind of magma which would form granite
Basalt
dark gray to black, hard tough rock, difficult to break, when exposed to weather, it may turn yellow or brown on its surface. Very common rock, very tiny crystals, used in roadways, is the rock outside the school, fine grained rock, the crystals are often microscopic, sometimes, basalt contains gas bubbles, because the lava cools rather quickly basalt iws fine grained.there is not enough time for the grains to become larger
Obsidian
black shiny known as volcanic glass has some gray areas sharp edges may contain some white crystals that look like snowflakes (snowflake obsidian), it may include swirls of a red color, breas and chips like glass, forms from rapid cooling lavea that has a lot of silica. The lava cools so fast that crystals do not have time to form. (Igneous)
Gabbro
dark green to black. When exposed to the weaterh its surface often turns brown, forms from a magma that is rich in iron and magnesium , and poor in silica (quartz). The magma cools and crystallizes deep below the earth's surface. Gabbro is from the same kind of magma as basalt, but because it cools more slowly, so it develops alrger crystals
Slate
dark grey to black, metamorphic rock, flat chalkboards used to be made from slate, can be used to make tiles for roofs or for stones in patio walkways shale metamorphosed into slate
Marble
Metamorphic white red or gray with many colors in it can be carved easily statues are made from it and buildings such as in Washington DC can also use marble chips in flower beds, Sterling Hill mine is made of Franklin marble
Schist
these rocks can be formed from basalt, an igneous rock; shale a dedimentary rock; or slate, a metamorphic rock; through tremednous heat and pressure, these rocks were transformed into athis new kind of rock.
Quartzite
if it's pure it's white, may have a yellowish to reddish color if it contains iron minerals, can be other colors is very hard and easily scratches glass, most is metamorphosed sandstone
Gneiss
these rocks may have been granite which is an igneous rock but heat and pressure changed it the mineral grains in the rock were flattened through tremendous eat and pressure and are arranged in altenating patterns
Coal
black hard metamorphic rock as anthracite, shiny used to heat homes, oil base, sometimes has colors of the rainbow shining in it