Classifying igneous rocks | Describing composition and texture

00:00 Introduction
00:54 Phaneritic (coarse-grained) texture
03:24 Pegmatitic texture
04:26 Aphanitic (fine-grained) texture
07:40 Porphyritic (bi-modal) texture
10:55 Glassy texture
12:58 Vesicular / porous texture
17:17 Fragmental / pyroclastic texture
19:07 Composition: Proportions of minerals
22:13 Classifying igneous rocks (how to give them a name!)
ABOUT ME:
👋 I’m Allison, a structural geologist and Earth Science educator in Northern California. I help college students and geology enthusiasts understand the processes that shape our planet. 🌎
💡Learn more about me at www.allisondeanjones.com
🎥For more videos like this one, subscribe: ‪@allisondeanjones‬
MY TECH:
📷Camera: Canon M50
🎙️Microphone: Blue Yeti X
📀Software: Camtasia 2022
MY FIELD GEAR:
🥾Boots: Lowa Renegade
🎒Backpack: Osprey Sirrus 36 or 24
🧭Compass: Brunton northern hemisphere
#geology #earthscience #science #earth #rocks

[@canadiangemstones7636]

You’re a natural teacher, this is excellent!

[@gabrielahmad1294]

Wonderful and very informative video. I have subscribed, thank you Allison.

[@proshotco49]

Thanks Allison , it was really useful and one of the best explanations about rock classification I've ever seen. I'll be grateful if you put a like for the chart .

[@HoboMinerals]

I love the explanation for the rocks! I really love that you elaborate on the important things! Thank you so much, I’ll be coming back to this video many times

[@Hoodster2013]

Thank you. You are one of the most articulate and informative instructors that I've encountered. I will continue to follow you. Keep up the good work.

[@allisondeanjones]

Thank you, Robyn! That means so much to me! ☺

[@frederiklausing5071]

awesome

[@hamishmclumsy816]

Excellent, clear, concise and informative, thank you Allison.comment

[@NisarAhmad-tc3ji]

👍👍👍👍👍 very good

[@johnmay6090]

Well explained which makes it so easy to understand. Also very easy to listen to. Thankyou.

[@allisondeanjones]

Thanks, John!

[@aleksandrak1265]

thank you, very useful and interesting!

[@sjmazzoli]

fantastic...very clear video helps along with your knowledge

[@thomassimonton8503]

Thank you for the Wonderful video.

[@dr1617]

Just Wow🎉❤

[@mhad94almaghribe]

Very good lecture Thank you!

[@OregonWildmanAKAsasquatch]

Id love to take you hiking and or rock hounding. 😊

[@MdMafejur-yj4nj]

❤❤

[@geoffgeoff143]

Good presentation

[@Riovientoselva]

Thank you for your time doing this video for the people. I am learning on my own. Could you give me some keys to differentiate an amphibole from a pyroxene (horblende vs augite) . Thank you

[@allisondeanjones]

Absolutely! The easiest way to distinguish the two is their cleavage. Amphiboles exhibit two cleavage planes at ~120 and ~60 degrees. Pyroxene exhibits two cleavage planes at ~90 degrees!

[@Riovientoselva]

@@allisondeanjones Thank you for your answer. I'll search and check that out

[@torment4723]

15:31 But surely we can hear

[@allisondeanjones]

😆I should have bounced the rock on the table!

[@CarbonTaxLOL]

I think it is harder when you start your career to know the difference between sand, clay, silt and rock.
Honestly you should make a video on it in the field.

[@allisondeanjones]

Great idea, Isaac! I'm hoping to post some videos from the field in the future!

[@ShahzaibAlam-dg7hb]

Hi

[@Nova-oy7rs]

You lost me at English system, think you were looking for imperial system

[@allisondeanjones]

Yep! Sorry, my mistake. :)

[@amritpatel3794]

Igne in Sanskrit is called Agni, means Fire. That means rock from Fire (magma)

[@Jhen_yfer]

Ignis

[@amritpatel3794]

@@Jhen_yfer
I am talking about Proto IndoEuropean language root of the word.