Igneous Rock Textures & Classification Based On Grain Size & Shape- Igneous Petrology #2 | GEO GIRL

This video covers how to classify igneous rock textures. We talk about what igneous textures are, why textures are important for igneous rock classification, the difference between igneous structures and textures, how the thermodynamics of crystallization controls igneous rock textures (bowens reaction series, gibbs free energy, enthalpy, entropy, reaction spontaneity, & metastability), how nucleation and growth rates are dependent on ion diffusion rates and how they control grain sizes in igneous rocks, how to classify igneous textures based on grain size (phaneritic, aphanitic, pegmatitic, glassy), how euhedral vs anhedral crystals form, and how to classify igneous rock textures based on grain shape (porphyritic vs 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, shop merch, learn more about me, and donate to support the channel if you'd like!)

0:00 What are igneous textures?
0:54 Igneous textures vs. structures
1:07 How rocks form textures
3:14 Gibbs free energy & crystallization
7:40 Is crystallization spontaneous?
10:04 What controls crystal size?
14:27 Grain size rock texture classification
17:48 What controls crystal shape?
19:42 Grain shape rock texture classification
20:58 Upcoming content!
22:19 bloopers!

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Oxygen by D. Canfield: https://amzn.to/3gffbCL
Brief history of Earth by A. Knoll: https://amzn.to/3w3hC1I
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Image sources:
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https://opentextbc.ca/physicalgeology...
https://vhmsscience.weebly.com/upload...
https://www.mdpi.com/minerals/mineral...
https://i.stack.imgur.com/mfRy9.png
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https://i2.wp.com/blog.amsoil.com/wp-...
https://img.xcitefun.net/users/2010/0...
https://i.pinimg.com/originals/99/32/...
http://www.cas.usf.edu/~jryan/Diabase...
https://i.pinimg.com/736x/26/6b/d3/26...
http://www.yosemite.ca.us/library/geo...
https://i.pinimg.com/originals/6e/d3/...
https://i.pinimg.com/originals/99/32/...

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