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  20090811_high_emigrant_lake_0146.JPG - The black minerals are hornblende crystals (about 1" long) in the pinkish volcanic rock called andesite. When large crystals are surrounded by a matrix of really small crystals (such as in this photo... the pink stuff really is made up of microcrytals, I swear!) we say the rock has a porphyritic texture.  
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 The black minerals are hornblende crystals (about 1" long) in the pinkish volcanic rock called andesite. When large crystals are surrounded by a matrix of really small crystals (such as in this photo... the pink stuff really is made up of microcrytals, I swear!) we say the rock has a porphyritic texture.
Date: 8/11/09 4:30 PM | Resolution: 3264 x 2448 | ISO: 100 | Exp. Time: 1/200s | Aperture: 4.5 | Focal Length: 52.0mm (~100.0mm) | Keywords: High Emigrant Lake Trail | See map
Total images: 171 | Last update: 8/15/09 4:03 PM | copyright 2009 mrhollister.com | Help