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Andesite and lava

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Andesite is an extrusive igneous rock consisting primarily of plagioclase plus pyroxene and/or hornblende. Biotite, magnetite, quartz and sphene are common constituents. Andesite has the equivalent composition to the plutonic igneous rock, diorite. Andesite is named after the Andes mountain range. These rocks are found near the subduction zones of ocean tectonic plates, along continental margins. Andesite forms at convergent plate margins and is thought to be the product of partial melts of the water-rich subducting oceanic crustal basalts or of the intervening wedge of lower crustal rocks above the subducting plate. While andesite is common in younger arc systems such as the Cascades, it is nearly absent in the older Sierra Nevadas, possibly a consequence of erosion.

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NSAL033
G684-Pic 072
Basalt
NSAL034
G684-Pic 055
Basalt
NSAL035
G684-Pic 070
Basalt
NSAL036
G684-Pic 005
Basalt
NSAI037
G684-Pic 014
Basalt
NSAL008
Honed surface
Basalt
NSAL015
Honed surface
Andesite
NSAL016
Cobblestone
Andesite
NSAL021
cut to face
Andesite
NSAL023
Chiseled surface
Andesite
NSAL024
Bush-Hammered surface
Andesite
NSAL028
Free size
Andesite
NSAL030
pineapple surface
Andesite
NSAL031
Bush-Hamm surface
Andesite
NSAL032
Honed surface
Andesite
NSAL014
Machine cut surface
Travertine black
NSAL017
Natural surface
zhangpu black
NSAL018
Pulled and natural surface
zhangpu black
NSAL019
Flamed surface
zhangpu black
NSAL020
Natural surface
zhangpu black

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