LAB FINAL Combined - SMS- GEOL 1403 with 100- correct answers

LAB FINAL Combined -
SMS- GEOL 1403 with
100% correct answers
list felsic rocks
rhyolite, granite, obsidian, pumice
list intermediate rocks
diorite, andesite
list mafic rocks
gabbro, basalt
igneous rocks
Form directly from cooling of magma or lava
metamorphic rocks
Rocks formed when other rocks are put under
extreme heat and pressure
andesite
- fine-grained (aphanitic)
- intermediate
- moderate silica

,diorite
- coarse-grained (phaneritic)
- intermediate
- moderate silica
- black and white speckles




obsidian
- glassy
- felsic
- high silica
- black




rhyolite
- fine-grained (aphanitic)
- felsic
- high silica
- light color, pink




pumice

,- contains many gas bubbles
- felsic
- high silica
- light gray or white




granite
- coarse-grained (phaneritic)
- felsic
- high silica
- Light-colored, often pink, white, or gray with
visible mineral grains




basalt
- fine-grained (aphanitic)
- mafic
- low silica
- dark, usually black or dark gray




gabbro

, - coarse-grained (Phaneritic)
- mafic
- low silica
- dark green to black




slate
- metamorphic
- parent rock: shale
- foliated
- aluminous




phyllite
- metamorphic
- parent rock: shale
- foliated
- aluminious




schist
- metamorphic
- parent rock: shale