An Unidentified light-colored igneous rock is made up of orthoclase feldspar and quartz. To what Family of Igneous rocks does it belong? Explain your answer. (and please not to long)
2007-03-05 06:54:07 · 6 answers · asked by Anonymous in Science & Mathematics ➔ Earth Sciences & Geology
From what you have described, I would infer that you are describing either an intrusive granitic rock or extrusive rhyolitic rock both free of plagioclase feldspar, but to correctly identity which type of granitic/rhyolitic rock it is, one must indicate the percentage of both quartz and orthoclase feldspar in the system
For example - Intrusive Granitic
50% Quartz, 50% K-Spar = Alkali Granite
For example - Extrusive Rhyolitic
10% Quartz, 90% K-Spar = Quartz K-Spar Trachyte
2007-03-05 07:06:31 · answer #1 · answered by Brian 3 · 0⤊ 0⤋
Orthoclase Rock
2016-12-11 14:54:14 · answer #2 · answered by ? 4 · 0⤊ 0⤋
The felsic family cos it contains no ferromagnesian minerals and only orthoclase felspar, not plagioclase felspar.
2007-03-05 07:54:27 · answer #3 · answered by Anonymous · 0⤊ 0⤋
I would place it in the Syenite family since it doesn't have any plagioclase feldspar in it. If it was a pegmatite, then I would put it in the Grano-diorite family.
2007-03-05 10:35:22 · answer #4 · answered by Amphibolite 7 · 0⤊ 0⤋
Hi. It's easier to just give you a good site. http://www.innvista.com/science/earth/geology/igneous.htm I agree with answer 1. Granite
2007-03-05 07:04:11 · answer #5 · answered by Cirric 7 · 0⤊ 0⤋
it is a rubin or granate.
2007-03-05 07:01:48 · answer #6 · answered by Vlado 4 · 0⤊ 0⤋