Granodiorite:R-152

Title: Granodiorite:R-152
Description: This hand sample of Granodiorite was found at Nantasket Beach, Massachusetts by Ralph Digman on October 16, 1949. The sample number is R-152 and belongs to the Department of Geology at Lafayette College.
This Granodiorite hand sample is a coarse grained intrusive igneous rock which means that it slowly cooled deep underground in a magma chamber (pluton) Its looks to be composed mostly of Quartz, Plagioclase and Alkali Feldspar but also looks like it could have a few biotite and hornblende crystals in it as well. One very possible composition percentage for this rock specimen would be about 60% Plagioclase, 15% Alkali, and 25% Quartz. This rock specimen has obvious phaneritic texture and kinda looks like it could be Granite. However, Granodiorite rocks have more Plagioclase and dark minerals than Granites. This Granodiorite hand sample is white, green, and black in color.
Creator: 4940
Type: Igneous Rock
Mediator: Tamara Carley

Media: https://exhibits.lafayette.edu/geology/files/original/5df6680713c5ca5188aa96696505ec45.jpg; https://exhibits.lafayette.edu/geology/files/original/84e59e7e2c1652885809a2c34e9e302e.jpg; https://exhibits.lafayette.edu/geology/files/original/c44c1f9d1b71bdeb1de2f65c49495031.jpg; https://exhibits.lafayette.edu/geology/files/original/574c441c64a2f8a2b9993b2367a9c9b0.jpg; https://exhibits.lafayette.edu/geology/files/original/7f893b9dbcb076d76935658e81767ae9.jpg

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