This video explains how to classify igneous rock textures. We talk about what igneous textures are, why textures are important for classifying igneous rocks, the difference between igneous structures and textures, how the thermodynamics of crystallization control igneous rock textures (Bowens reaction series, Gibbs free energy, enthalpy, entropy, reaction spontaneity, and metastability), how nucleation and growth rates depend on ion diffusion rates and how they control grain size in igneous rocks, how to classify igneous textures based on grain size (phaneritic, aphanitic, pegmatitic, glassy), how euhedral and anhedral crystals form, and how to classify igneous rock textures based on grain shape (porphyritic or vesicular).

References: Essentials of Igneous Petrology by Ronald and Carol Frost: https://amzn.to/37Zs9AL
Earth Materials by Cornelis Klein and Anthony Philpotts: https://amzn.to/3z5sCxe

GEO GIRL Website: https://www.geogirlscience.com/ (visit my website to see all my courses, buy products, learn more about me, and donate to support the channel if you wish!)

0:00 What are igneous textures?
0:54 Igneous textures vs structures
1:07 How rocks form textures
3:14 Gibbs Free Energy and Crystallization
7:40 Is crystallization spontaneous?
10:04 What controls crystal size?
14:27 Classification of the texture of granulometric rocks
17:48 What controls the shape of the crystal?
19:42 Classification of rock texture by grain shape
20:58 Content coming soon!
10:19 p.m. blooper reel!

Hello, Earth lover! Discover my favorite planet-friendly products:
Bamboo toilet paper: https://shrsl.com/3cvku
Bamboo paper towels: https://shrsl.com/3cvkw
Compostable tableware: https://shrsl.com/3cvkz
Compostable trash bags: https://shrsl.com/3cvl0
Bamboo Cutlery + Straw! : https://shrsl.com/3cwfl
Eco-friendly tote bag (great for grocery shopping!): https://shrsl.com/3cwfp
Reusable straws + cleaning brushes (my favorite!): https://shrsl.com/3cwft
Eco-friendly laundry detergent: https://shrsl.com/3cwgo

Directly offset your carbon footprint with Wren: https://shrsl.com/3d0t2
(Just click the link, hit Get Started, take the free C Footprint quiz, then choose how much you want to reduce your footprint by donating to the C sequestration projects they fund!)

Non-manual books I recommend:
Oxygen by D. Canfield: https://amzn.to/3gffbCL
A Brief History of the Earth by A. Knoll: https://amzn.to/3w3hC1I
Life on a Young Planet by A. Knoll: https://amzn.to/2RBMpny
Some assembly required by N. Shubin: https://amzn.to/3w1Ezm2
Your Inner Fish by N. Shubin: https://amzn.to/3cpw3Wb
Oxygen by N. Lane: https://amzn.to/3z4FgwZ
Alien Oceans by K. Hand: https://amzn.to/3clMx1l
The Engines of Life: https://amzn.to/3w1Nhke

Tools I use as a geologist/teacher/student:
Geology Field Notebook: https://amzn.to/3lb6dJf
Geological Rock Hammer: https://amzn.to/3DZw8MA
Geological compass: https://amzn.to/3hfbdLu
Geological lens: https://amzn.to/3jXysM5
Camera: https://amzn.to/3l6fGRT
Carbon Neutral Pencil Case: https://shrsl.com/3cvjv
Carbon Neutral Backpack: https://shrsl.com/3cvkc

Image sources:
https://i.pinimg.com/originals/75/5a/6b/755a6bfac6b0f83d2ec1c915e5aa22bd.jpg
https://opentextbc.ca/physicalgeology2ed/wp-content/uploads/sites/298/2019/06/Bowen-reaction2.png
https://vhmsscience.weebly.com/uploads/1/2/7/6/12762866/849033_orig.jpg
https://www.mdpi.com/minerals/minerals-10-00337/article_deploy/html/images/minerals-10-00337-g014.png
https://i.stack.imgur.com/mfRy9.png
https://clipground.com/images/coarse-crystalline-clipart-16.jpg
https://i2.wp.com/blog.amsoil.com/wp-content/uploads/2016/08/Kinematic_Viscosity_Concept.jpg?resize=790%2C628&ssl=1
https://img.xcitefun.net/users/2010/03/160600,xcitefun-lava-5.jpg
https://i.pinimg.com/originals/99/32/59/993259bf9b9823efb1428d80f6a10537.jpg
http://www.cas.usf.edu/~jryan/DiabaseXPL.JPG
https://i.pinimg.com/736x/26/6b/d3/266bd38d7a3c9c27dde9db4d26bb0193–polarizing-microscope-shape-patterns.jpg
http://www.yosemite.ca.us/library/geologic_story_of_yosemite/images/14.jpg
https://i.pinimg.com/originals/6e/d3/01/6ed301fb9430b01c7a48c6df8669f431.jpg
https://i.pinimg.com/originals/99/32/59/993259bf9b9823efb1428d80f6a10537.jpg

Disclaimer: Links included in this description may be affiliate links. If you purchase a product or service through the links I provide, I may receive a small commission, but there is no additional cost to you! Thank you for supporting my channel so I can continue to provide you with free content every week! And as always, let me know your topic suggestions in the comments below!

Please take the opportunity to connect and share this video with your friends and family if you find it useful.