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Igneous Rock

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Stacy Arnold

on 17 October 2012

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Transcript of Igneous Rock

Igneous Rocks Stacy Arnold's Igneous Rock Presentation porphyritic ryholite is the texture in a rock. Porphyritic Ryholite Andesite- a dark, fined grained, brown to grayish volcanic rock that is intermediate in composition between ryholite and basalt.
Andesite has 60% silica,
Hardness is 7 on the Mohs scale.
Andesite can be found in Alaska and Hawaii.
Andesite can be used for tiles, bricks and to landscape gardens. Diorite- Is a igneous rock that's black and white.
coarse grained
Has large uniform crystals.
Diorite is found under the crust.
The hardness is 7 on the Mohs scale.
You can find diorite in Arizona and in South America.
Diorite is used for counter tops, plates and tiles. Quartz- Quartz is a hard white mineral consisting of silicon dioxide.
The 2nd most abundant mineral.
It's colorless to pink, red, yellow, and green.
The hardness of quartz is 7 on the Mohs scale.
You can find quartz all over the world besides the ocean.
Quartz is made for glass, sandpaper and jewelry. Basalt- The grain size of Basalt is very fine. It's an extrusive rock. Basalt is usually a dark color like black. The hardness of Basalt is a 6 on the Mohs scale. 50 percent of Basalt is silica. This rock has a very high content of FG/MG. Other compositions are feldspar, quartz, and plagioclase. Basalt is mafic. Most oceans are ophitic basalt Ophitic basalt is a fine grained rock that
is often used for orthopedic use. Limonite- An amorphous brownish, secondary mineral which consists of iron ore.
Originally mafic
fined grained and may have crfacks and pockets.
The hardness for Limonite is 4 on the Mohs scale.
Limonite has a high silica content.
Limonite is found mainly in Austria and England.
Limonite is used for a pigment in paint and used for medical purposes by the Chinese. Vesicular Basalt Gabbro- is a coarsed grain that is a darker color.
It's an intrusive igneous rock. The grain size is fairly
big. Th hardness of gabbro is 6. This rock has a
medium amount of silica. FE/MG is rich in the mineral of gabbro. This rock is mafic. Gabbro is found in the Earth's oceanic crust. Pegmatite- is a light colored, intrusive rock , with coarsed
grain, and very large crystals. The hardness of pegmatite on Moh's scale is seven to ten. It has low silica content. The FG/MG content is knid of low. Pegmatite is mostly felsic. South Australia is a popular place to find pegmatite. Magnetite- Magnetite is a gray black mineral
that has iron, and oxide. The grains size of magnetite
is very small.Thsu mineral is an extrusive rock. The
hardness is around 5.5 to 6 on the Moh's scale. Magnetite has a low silica content. Magnetite has a high content of FG/MG IT IS 35% TO 60%. This rock is classified as a mafic igneous rock. Magnetite is found in most of the igneous and metamorphic rocks. Scoria- Scoria is an extrusive rock, that is light colores,igneous rock. The grain ize of scoria is coarse. The hardness on Moh's scale is ranged from 6 to 6.5. Scoria is 50% silica. The FG/MG in scoria is higher. Scoria is a mafic rock. Scoria can be found after eruptions brcause it's a molten rock. Tephra- Rock fragments and particles ejected by a volcanic eruption.
Either felsic or intermediate.
Formed when lava and water mix, cool and then solidify, forming many smal bubbles.
The density is less than 1.
You can find tephra around volcanoes after they've erupted.
The hardness of tephra is about 5 on the Mohs scale.
You can use tephra for a volcano demonstration. Otherwise tephra isn't really used for anything. Igneous Rocks granite-A very hard, granular, crystalline, intrusive igneous rock consisting mainly of quartz, mica, and feldspar and often used as a building material. it is found in containtal plates. vesicular baslat is basalt with a vesicle texture. By: Tia Blackmore granite is course gran. has many different color such as black, red, white, and tan. it has a hardness of 8. Silica content is 53%. Fe/Mg is 65 to 75% it is mafic. http://geology.about.com/od/rocks/ig/igrockindex/rocpicscoria.htm
http://www.redorbit.com/education/reference_library/earth/minerals/2575128/magnetite/ Tia Blackmore Citations porphyritic rocks Citations: Stacy Arnold
http://www.ux1.eiu.edu/~cfrbj/parks/MSHE/lapilli.jpg Any igneous rock with crystals embedded in a finer ground mass
of minerals. Dallas Knox
http://www.redorbit.com/education/reference_library/earth/minerals/2575128/magnetite/ http://www.google.com/imgres?num=10&um=1&hl=en&safe=images&biw=1280&bih=935&tbm=isch&tbnid=yMh1JsH8d-gK-M:&imgrefurl=http://marsrovers.nasa.gov/spotlight/hematite01.html&docid=cX1ItpkxqSoI0M&imgurl=http://marsrovers.nasa.gov/spotlight/images/hematite_br.jpg&w=500&h=333&ei=ilJ9UPfaL4n49QTJnYGABg&zoom=1&iact=rc&dur=415&sig=116970790897844092476&sqi=2&page=1&tbnh=140&tbnw=197&start=0&ndsp=30&ved=1t:429,r:1,s:0,i:137&tx=113&ty=77 hematite-A black or blackish-red to brick-red mineral, essentially Fe2O3, the chief ore of iron. The hardness of this rock is 5-6. it is found by iron ore. Obsidian- Obsidian doesn't really have a grain size. It is usually black and very shiny. It can be grey or brown too. Obsidian is and extrusive rock. Hardness ranges from 5 to 5.5. Obsidian has a high silica content.FE/MG is very high in obsidian. It can range from 45 to 55 percent. Obsidian is mafic. It can be found mostly in the West.
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