2007-03-26 16:17:11 · 3 answers · asked by Mili 1 in Science & Mathematics ➔ Earth Sciences & Geology
different textures in igneous rocks can be attributed to mineralogy and cooling rates. Slow cooling will produce course textures (granites) , while fast cooling will produce fine textures(basalt).
2007-03-26 16:22:35 · answer #1 · answered by Professor Kitty 6 · 7⤊ 0⤋
Igneous rocks have different textures and appearances due to the way that they formed. If a rock formed from a liquid very slowly inside the earth (plutonic), then you can see all of the individual crystals of feldspar, mica, quartz, etc. inside it. This is the rock that makes some peoples countertop; granite.
Other igneous rocks form after being cooled very quickly due to exposure to air (volcanic). These are blown or oozed from a volcano and include pumice, obsideon, scoria, etc. These are essentially the same as plutonic rocks, except that they cool so quickly that the crystals seen in granite cannot be seen by the naked eye anymore, due to the rapid cooling. Also, some of these stones (especially scoria and pumice) have lots and lots of air bubbles, resulting in a low density and a pock marked texture.
2007-03-26 16:24:59 · answer #2 · answered by mericafyeah 2 · 5⤊ 0⤋
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2007-03-26 16:29:48 · answer #3 · answered by christ c 1 · 0⤊ 6⤋