Rock Identification with Willsey: Foliated Metamorphic Rocks - Slate, Phyllite, Schist, and Gneiss

[@WayneTheSeine]

Great presentation. Now, if I were still young enough to remember it all. The rock with the garnet in it is stunning. I would freak if I found that.

[@jlr3636]

I purchased a sample almost identical to that piece, mine has 3 garnets and there are impressions in the schist where 5 more garnets were at one time, I believe the sample came from Alaska. I wonder if there might be more garnets inside if i split it open however I would be concerned it might destroy the sample.

[@dixonbuttes6564]

Your videos are like a college class on KZbin … thank you for making them!

[@shawnwillsey]

Thanks for the kind donation. Glad you enjoyed learning.

[@Raptorman0909]

One must be careful talking when about a Gneiss Schist -- especially after a couple cups of coffee... I'm really loving these videos and I appreciate the opportunity you provide to learn things I would struggle to learn from a book....

[@scotte-p7715]

Thanks for your series. Been almost 40 since I got my undergraduate geology degree. Brings back old memories.

[@sdmike1141]

Thanks! Possibly the BEST…of the rock lab series…until the next one. 🤣. Thanks!

[@shawnwillsey]

Hey thanks so much for your kind words and donation. These have been fun and relatively easy to do.

[@mawi1172]

❤❤❤❤❤❤. Your channel is very gneiss. 😂🎉🎉🎉🎉🎉

[@mizzougrad001]

Top tier dad joke my friend

[@shawnwillsey]

It's tuff to not be too full of schist.

[@Panicagq2]

lol My wife got me a T-shirt that says "Schist happens...metamorphically speaking."

[@dancarlton7973]

I had a high school science teacher who once said "phyllite schist" but it sounded like he used profanity.

[@Duhble07]

That’s very gneiss of you to say!

[@Sir_Joel7]

As a level 200 Geology student in Botswana, I gotta say your videos are very much appreciated.❤‍🔥

[@shawnwillsey]

Glad they're helpful. Keep up the hard work!

[@grandparocky]

Thanks for the timing of this install of your series. I just picked up some banded quartzite this week and this helped identify it perfectly.

[@HolySpiritFire3]

Thank you! A very clear presentation for non-geologists!

[@Danika_Nadzan]

Another great learning opportunity, thanks! Seeing the rock samples as you describe them makes it so much easier to grasp, and the diagram of where they form helps it makes sense. By the looks of my small rock collection from my travels, I have a preference for gneiss. It's "nice" to know what they are! BTW, that twin garnet porphyroblast was beautiful!

[@muzikhed]

I have a few examples in my collection of which I was not certain as to what rock type they may be and now I can happily be sure they are Phylite, Schist and a wavey banded Gneis. These classroom videos have all been quality learning experiences. Thanks heaps. Btw, that Schist with that enormous Garnet is awesome. I have some similar examples though the Garnets are tiny however they are still indicative of high temperatures.

[@john-draftanimal]

Thanks!

[@AllenMwiru]

To be honest,you are the best ,I understand your lecture,may GOD bless you,🙏🙏🙏👏👏👏👏

[@loompy1440]

I felt like a total piece of schist today, but this video distracted me and now I’m feeling quite gneiss. (I’m from Idaho too btw)

[@Riovientoselva]

Muchas gracias por tu tiempo. Tus videos son siempre informativos and gneiss 😅. Un abrazo !

[@shawnwillsey]

De nada. Gracias por ver.

[@Rachel.4644]

It feels great to be back in the classroom, Shawn! 😄 I really learn from these rock ID sessions. Thank you so much!

[@shawnwillsey]

You are so welcome!

[@mizzougrad001]

Cool that you upload the notes.

[@davidk7324]

So much comes together as I view these--thanks!

[@valerieoleary6876]

Awesome video and very informative. I'm in the Northwest Territories in Canada, not far from Rock of Ages, Acasta River. (oldest rocks in the world) I've found so many rocks here and now I know what I have and how they are formed. Amazing!

[@scotte-p7715]

Thanks!

[@shawnwillsey]

Much appreciated. Thank you for your support.

[@LordLotman]

I just got into your channel a few weeks ago and had this vid casted on my TV (I usually watch on my phone) and my wife literally said “Why the F are you watching rocks?!” It’s a shame that some people choose to ignore our amazing planet’s history including my wife! Lol When I was at San Diego State I had to take a minor and I took geology (Comm major). Bc classes were so impacted I ended up in a few masters geology classes and absolutely loved it. I’m in sales now, but man, I wish I could somehow have a sales career and work in ur field! Keep up the great content!

[@shawnwillsey]

Thanks for the kind words. Yeah, my wife doesn't get it either but she supports it and is probably impressed I made geology and rocks a viable career. Thanks for watching and learning with me.

[@Anne5440_]

In my family, it's the females that are into rocks. Dad would look at the coffee cans full of pebbles mom who bring home from agate beach in Washington and just shake his head. He didn't seem to realize I had my own sack of those pebbles. He also didn't know that I had hidden when we moved from VA a 10 by 6 inch Rock full of fossils. I snuck that home from girl scout camp along the Potomac River. I still have it, too. I've continued to bring rocks home all my life. I have a piece of mt Stuart granite in my medicine bundle. My middle daughter has taken after mom and I. I told her about your id series, and she wants me to teach her, lol. I've really enjoyed this series.

[@Rachel.4644]

​@Anne5440 so true! Funny how we remember just where we found our special ones. I joke about all the rocks I've collected sinking our property. 😂

[@NavyOU37]

Thank you so much Shawn! You mentioned Phyllite during your Metamorphic lecture. It helps me understand how rocks such is Anthophyllite forms (a form of Asbestos). I live in Virginia and just east of the Blue Ridge Mountains, you can find many asbestos rocks. When it comes to Anthophyllite it is formed in the same way (generally speaking) as Phyllite. But the parent rock was Ultramafic Basalt with dolomistic shale that is high in Magnesium. It is incredible how many different Phyllites there are based on different minerals that were Metamorphosed. You put the pieces together to understand its formation.

[@SebastianForeroEscovar]

I watched mainly for the gneiss section, as Ive seen some in the field that I kinda want to call schists but my friends would rather call gneiss. The Augen gneiss you showed was very similar, so I was happy to hear you say you could call it a schistose gneiss.

[@HoboMinerals]

I love the examples with the explanations! Thank you so much

[@StellaVinum]

Nice schist Professor, especially that augen one at the end. It resembles the skeleton of a dead cacti, like a cholla.

[@andreasseyffer]

Very clearly explained, could we have a succession of rocks in the same area?

[@gerritroeterdink]

Gneiss video. Greetings this time from Moscow Idaho (normally from the Netherlands, I'm on holiday in the US and meet some geologist like Nick Zentner and Jerome Lesemann)

[@Rincypoopoo]

Beyond helpful. looking forward to walking the river bed (Guadalfeo) and looking for Phyllite, Shist and Gneiss. Really great to go a little deeper into my fascinating local geology. We have shist that is full of Garnets, but they are all tiny, damnit...

[@TinasTVx]

Really enjoying this series on rocks - I want to go gold panning in the Yukon on vacation maybe I will recognize more rocks because of this.

[@YOICHIHAGIWARA]

ありがとうございます！

[@darrellid]

When too much heat and pressure build up, you eventually have to take a Gneiss, big Schist.

[@john-draftanimal]

Late comment, keep coming back to review your vids, many thanks. I don't think all schists have prominent mica. On Whitechuck mountain and surrounds I don't remember noticing that even though it supposedly comes from the old sediments prior to the cascade belt formation. Also I wonder about igneous derived schists. I'm just an amateur so I have difficulty with such, particularly what seems to be a nexus in metamorphic terminology with a meeting of parental lines for igneous vs sedimentary or conglomerate derived schists and gneiss. Maybe that would be a great vid to focus on that here in the PNW since we seem to have so much in the 'Crystalline Core'. Yes I'm also following Nick Zentner.

[@AllenMwiru]

Thanks, professor Shawn willsey

[@brucedymock6635]

Great stuff loved the examples good choices thanks

[@Quarterborefan]

Thanks. Great work as always

[@LanceHall]

I simply can't find a good reference site with good photos and videos for mineral and rock identification. That's why I'm here. Great video series. Google Images today just links to low res photos on Twitter or Reddit.

[@BarryNevin-w4m]

Hi Shawn, I enjoy your ID series. Can you explain how the banding in a foliate rock occurs, when starting from a piece of ordinary granite and then undergoing metamorphic heating and pressure. Do the minerals melt and sink to a certain point where they all have similar densities, or is there a chemical attraction which leaves them all in individual layers? It seems as if layers of different thicknesses should not be possible without some other reason?

[@marklang5169]

Excellent thank you!

[@patrickkillilea5225]

The Shist with the Garnet is very cool.

[@whycivilequalsinsane]

Granite can form schists and gneiss as well

[@whycivilequalsinsane]

I realized later that the progression of slates to gneiss is explain for clarity of concept. Ive seen it being taught a couple times the same way, I learned through seeing granite schist and gneiss so its always coconfusing.

[@kaboom4679]

And I'm between is migmatite , which resembles a lava lamp frozen in time . This is literally the birthplace of continental crust , as the lighter felsic minerals are segregating from the darker magic minerals , and , rising to form batholiths . And yes , granite can exhibit flow banding , and , be metamorphosed as well . Mother nature has quite a messy lab , and will recycle all things in due course .

[@mehrozhassan1694]

Pls do explain the metamorphic facies.

Thanks for the morning-class, along with my coffee! 😀 Gneiss ! In Swedish - Gnejs!

[@GRosa]

Do you have a mudstone sample you could show us? If you already have shown one, could you please point me to the pertinent video. Thanks!

[@shawnwillsey]

kzbin.info/www/bejne/bYKoY4Zsr6t9sKcfeature=shared

[@RU3YJB]

Must gneiss always be coarse grained? I've found some very old, highly altered stones on Lake Erie beaches that are glacial till or erratics coming from archean to proterozoic regions in Canada, and the extreme age combined with beach weathering/smooth polishing, they're more glassy or gemmy.... with the requisite foliation or banding. The reddish ones, I'm thinking are a rhyolite gneiss, but it's very confusing. Some are granitic. There's also "unakite" -- and lots of variations or degrees of epidotization. It's difficult for an amateur!

[@7inrain]

Am I mistaken or is the third piece of Gneiss (at @18:05) also a bit of an Augengneiss?

[@uuserwxyz]

Hey professor, can a slate sometimes also be in spherical kind of shape?

[@WonNso]

Wow interesting I have learnt a lot

[@sultan-b2k6w]

I am from India's top renowned Banaras hindu university as I am backbenchers, last time of my exam it really helps me to identifying rock

[@jefferyjohnson8508]

I have some foiliated metamorphic rock with mica or shcist but it’s soft and crumbly could it be something different

[@caynaanshecabdalemohamed500]

Thank you

[@aboahmedalzahrani8785]

I would like to thank you for the explanation and education, as I have benefited a lot from you. I hope that you will provide a translation in Arabic, because we are your students from Saudi Arabia.

[@davidpetersen1]

AWesome.. super helpful

[@tanyanoel2203]

How may I get a copy of the lesson sheets you're presenting?

[@shawnwillsey]

Look under video description for link.

[@jackbelk8527]

Maybe a field trip to Middle Mountain to the Oakley Stone quarries?

[@shawnwillsey]

This might work: kzbin.info/www/bejne/Y4iVkJKVgLGHiqM

[@jackprier7727]

The ones with those cool leaf-fossils in em?

[@pdledesma]

How do i discern foliated from sedimentary bedding?

[@shawnwillsey]

Foliation is the alignment of minerals and will also occur in crystalline rocks as opposed to bedding which is in sedimentary rocks made of grains or organic material.

[@lilysceeliljeaniemoonlight]

Good Schist! 😉⛰️🌏🌎🌍

[@johncooper4637]

Shawn, the link to your notes does not work. I was able to go back to a previous video and get the current PDF.

[@shawnwillsey]

It's fixed now. Thanks for letting me know.

[@donnacsuti4980]

The foliated metamorphic rocks with striped layers I've seen in the Sierra Nevada above the elevation of granite.

[@briane173]

"That's a nice gneiss you got there...." 'Yeah I took a gneiss schist just the other day in fact....'

[@Barley150]

How hot and how high pressures?

[@skyepilotte11]

Than you...

[@destob9586]

my parking lot at work is lined in gneiss That are growing purple crystals on the exposed side of the rock I thought it was pretty cool 😎

[@shawnwillsey]

Probably garnet crystals. Fun.

[@destob9586]

Is it a metamorphic rock creating a igneous rock?

[@cosimocarroccia4566]

Molto belle queste pietre

[@AdamKabuye-j1k]

If I have 5 rocks can you buy it

[@guiart4728]

Excellent! I have examples of all I found in Washington state that are from glacial deposits on Puget Sound. Helps to understand that the bands sometimes come from the temperature and pressure and not bedding.

[@alabamaraptor8610]

thats a nice fire extinguisher in the corner

[@mosiah3197]

Foliated derives from the latin word for leaf: folium. Never once have I heard a geologist associate foliated with leaf-like.

[@kendixnobel9583]

Please what is Halo in geology

[@shawnwillsey]

You can support my videos by clicking on the "Thanks" button just above (right of "Download" button) or by going here: www.paypal.com/donate/?hosted_button_id=EWUSLG3GBS5W8 I appreciate your support, comments, and encouragement as we learn together.

[@cosimocarroccia4566]

Molto belle queste cosa cifanno?

[@lauram9478]

❤

[@tsawra007]

How about jadeite ? Metaphoric rock 🪨

[@3xHermes]

👍

[@markkilley2683]

Very Gneiss.

[@heezyyyy]

Gniess one

[@JP-el6dm]

Thanks!

[@AllenMwiru]

To be honest,you are the best ,I understand your lecture,may GOD bless you,🙏🙏🙏👏👏👏👏

[@stevewhalen6973]

Thanks!

[@shawnwillsey]

You bet!

[@stevewhalen6973]

Thanks!

[@patricialingenfelter1117]

Thanks!

[@shawnwillsey]

Much appreciated. Glad you found this helpful.

[@brookgardner2302]

Thanks!

[@shawnwillsey]

Thank you! Appreciate the support.

[@traycekidd8221]

Thanks!