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Gigapans

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  1. This porphyritic hornblende dacite was collected at Black Butte, a dacite dome located beside Interstate 5 just west of Mount Shasta in the Cascade Range in northern California. Black Butte is the hill on the left side of Rich Gibson's GigaPan "Cinder cone and Mount Shasta (l6)" (www.gigapan.org/viewGigapan.php...

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  2. Oooh, look at all the pretty minerals!

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  3. A little more mafic than the Sentinel Granodiorite.

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  4. These are Minerals 36-70 for Geo 306

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  5. Unfortunately I couldn't get any closer to the wall to add Berti and Edi for scale, so you'll just have to take my word for the fact these garnets are about 5-10cm in diameter.

  6. There is one rock exposed along the Billy Goat Trail which is a bit more enigmatic. It is amphibolite, a metamorphic rock very rich in the mineral amphibole (a.k.a. hornblende), which shows up as black in this picture. The white portions of the rock are plagioclase feldspar. This is a very mafic metamorphic rock, with ...