12. Name the 8 minerals commonly found in igneous rocks. Spelling counts. 13. A
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Question
12. Name the 8 minerals commonly found in igneous rocks. Spelling counts.
13. A rock consisting of the three lightest-colored minerals (from the list above), with a phaneritic texture, would be classified as a _____________________.
14. Light colored igneous rocks are rich in _______ and _____.
15. Dark colored igneous rocks have large amounts of _______ and _____.
16. Name the phaneritic rock type that consists of 50% light and 50% dark minerals:
__________________ What is its aphanitic equivalent? __________________
17. Granitic rocks are normally found on the __________________ while basaltic rocks make up most of the__________________ .
18. Most of Yosemite National Park is composed of a granodiorite batholith. Are these rocks intrusive or extrusive? _______________________
19. Yellowstone National Park in Wyoming overlies a hot spot beneath the continental crust. What types of features (general term) would you find in this park, that are related to the igneous activity?
Explanation / Answer
12) In igneous rocks these are the minerals commonly found Olivine,Pyroxene (example is Augite),Amphiboles(example is Hornblende),Biotite,Muscovite,Quartz,Plagioclase feldsphar,Potassium feldsphars.
13)The igneous rocks having light color minerals and having the phenaretic structure are classified as Pumicite.
14)Light color minerals are rich in feldsphars(Example of these are white color,grey,Green,pink and greeen) and quartz (Examples of these are rock crystals(colorless) ,amethyst(Transparent),Rose quartz(red-rose,pink).
15)Dark colored rocks have large ammounts of Oliivines,Pyroxenes,& Plagioclase feldsphar.
16)The phaneretic rock type that consists of 50% light and 50% dark minerals Andesite,Rhyolite,Basalt and its aphantic eqvivalent is Basalt,Andesite,Rhyolite
17)Granatic rocks found on the Continental crust and these are intrusive rocks of felsic nature. Basaltic rocks are make up of most of darck minerals and extrusive rocks they mainly contains Plagioclasic felsphars and pyroxene minerals.
18)In Yosemite national park the Granodiorite batholith rocks are intrusive rocks.These are the Intrusive suits of Batholiths and group of Plutons.
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