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Rhyolite

Rhyolite is an igneous, volcanic rock, of felsic (silica-rich) composition (typically > 69% SiO2—see the TAS classification). It may have any texture from glassy to aphanitic to porphyritic. The mineral assemblage is usually quartz, sanidine and plagioclase (in a ratio > 2:1—see the QAPF diagram). Biotite and hornblende are common accessory minerals. It is the extrusive equivalent to granite.

(Wikipedia)
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Oldest photo 06/26/2015
Newest photo 01/27/2016
Alternative titles "Rhyolite Ghost Town"
"Rhyolite Mercantile"
"Rhyolite ghost town"
"Rhyolite Ruin"
"Rhyolite Ruins"
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