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Igneous Rock - Blog Posts
“One of my Earth Science high school students is passionate about baking, adamant that she'll become a professional baker. Instead of doing a presentation to summarize her research projects, I allow her to bake what she researched. I think what she produces is amazing. Here's her obsidian cake.” - Goldraven on reddit
Posted on reddit by goldraven. Please go check out this girl’s instagram @honeyandgrey !!!!!!!!!
Please please please reblog!
Hullo-geology student.
These looks like fluvial, or river, cobbles. They get the rounded shape from moving down-stream, the rounder the rock the longer they stayed in the river.
The top one on the right, sort of white-ish, looks like a chert pebble. This is made of the same stuff as quartz, and is super resistant to weathering, so they last a long time, especially in river systems.
Both of the middle ones look sort of like granite or perhaps a breccia. Breccia is a form of sedimentary rocks where smaller rocks get cemented together and make a bigger rock. The angular shapes of the rocks looks like feldspars, indicatinf a granite that got weathered. I think that the bottom left one is also a granite.
The top left one and bottom left one I dont really know. They both kinda look like granites, but it is difficult to tell. The bottom left one looks like it cooled with magma mixing, so there are larger grains with smaller ones, a texture called porphyritic.
I should note, this is based almost entirely on grain size, coloration, and pattern. I am also guessing because I don't know the geologic history of the area. Soooo i might be wrong but this seems like the most likely based on the images.
Thanks for showing me rocks i think theyre really nice
i wish i had a geologist friend who could sit me down and tell me everything about these rocks and what kind of rock it is and how they were formed and everything about them:(
theyre just normal rocks but i want to KNOW about them.