What is quartz? A Geology Johnson explains!
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- เผยแพร่เมื่อ 30 ก.ย. 2024
- #minerals #quartz
What are the secret types of quartz? A geologist explains! Geology Johnson explains and demonstrates a few of the varieties of quartz, one of the most common and abundant minerals on the Earths surface.
Quartz crystals are probably what you think of when you hear the word crystal, but did you know about the different types and their unique colours and forms? Watch the video to see a peek into the qurious world of quartz!
Love that Jasper for what it represents. Banded Iron and Stromatolites are one of my all time favourites for what they represent. Nice informative video. Cheers
Then you will enjoy the future videos I'm making about BIF's and the 3.2 billion year old stromatolites I am studying.
i've been an avid crystal and gem collector since a child but i'm new to hunting (🇬🇧)i've got a lovely bit of what i think is Jasper which i really need identifying if you think you could be of help? 🙏🏻💎
Hi
sup, yo
Another really interestingly informative video. Cheers.
I’m newly diving into geology, currently focusing on the features of my location (southern US). I live on the outskirts of Alabama’s tin belt, adjacent to both the Rockford Granite and the Wedowee Formation, so I have picked up quite a diverse collection in a short timespan. However, since I live *near* all the local schists I have many quartz/silicate specimens that are likely mixed with other material. So much trouble separating quartz/quartzite/calcite/chert/beryl when they’re all mixed up and speckled with mica! Is there a reliable way I could learn to identify local rocks and minerals on my own?
Welcome to geology and earth science! A lot of excitement lies ahead for you! Those are common newbie troubles you're having and there is no easy way other than to practice. If you've not seen it already have a look at my playlist on how to ID common minerals which shows you the basics of observing and interpreting mineral you might find in the field. th-cam.com/play/PLfreN0HyEm2TW27UNXofaqE8MRVvbUaQG.html Don't worry, you will soon get the hang of it! :D
Fantastic information!! Appreciate you!! 👏
Thanks, glad it was useful!
I have a niggling doubt about what is Quartzite. Speaking to people and watching videos there seem to be several interpretations. I thought it was a rock of metamorphosed Quartz sand grains like what you called Grain-quartz but you didn't mention Quartzite in your talk. ???
Quartzite is metamorphosed pure (or nearly pure) quartz sandstone where all the sand grains have recrystalised. I didn't talk about them in this video because I was focusing on the other types of quartz. I will probably do a metamorphic video about them.
Meow meow meow
Purrfect
Love ya approach ya old dag. Rocks for dopey old buggas just like me
Glad you like it. This is how I explain it to myself when I am learning.
we have a small mountain which has lot of quartz crystals , mostly the size of 2 inches for indicidual crystal and a foot with when they are all together, any suggestions as to if there was any volcanic activity nearby ? just want to know so that i can avoid falling in volcanic tubes if any ,
enjoying current crystal hunt .
also want to know how these are formed ?
Sounds interesting. Where in the word is your mountain? Context is really important for this sort of thing. :)
I know you're not a fan of petrology,lol, so exsolution is out. How about how those granite batholiths end up on the surface.
I like petrology, I just like teasing my petrology colleagues because they tease me about playing with mud. Most batholiths end up on the surface (exhumed) through a combination of uplift, faulting and erosion. Not sure if there are any newer models though.
hilo sir i have found a quartz in my land uf u have interesting about my quarts u can send me msg thank you
How exciting! You could make a video about them!
Great lesson , i wrote it down with pen and paper
Glad to hear you found it useful!
Why is quartz so absent in meteorites and abundant on Earth?
I don't know. I'll have to ask one of my colleagues who studies meteors. If I had to guess, it's because most meteors come from the core and mantle of a rocky planet that was destroyed in the early solar system, these areas are usually relatively poor in silica so quartz cannot form. Most quartz is from the crust of rocky planets which is relatively rich in silica.
@@geologyjohnson7700 well, all differentiated planets seem to be rich in silicates, but not quartz, that’s what I’m wondering about… I’m into ALL rocks..
Hello, I'm looking forward to your video on biogenic silica. In the US, deposits of a mineral called Novaculite are mined in the Ouachita mountains in Arkansas and used to make sharpening stones. Can you explain how old and how these rocks were formed?
Also, in Charnwood Forest, a stone was quarried in the 19th century to make sharpening stones. They were called Charnley Forest or Charley Forest oilstones. They're interesting because of the connection to the ediacaran fossils found in that region. Can you offer any information on these stones?
I'll have a look into them. Sharpening stones are interesting and can be quite varied. We have one here in Belgium called "Coticule" that is really weird.
Lots of sharpening nerds like me enjoy hearing about what these stones are about. You have a video where you talk about the Charnley Forest stones, the Ediacaran and Cambrian Volcanoes fossils and mud one. It's the green mud stone. I've a Coticule as well. A video on that one would be cool, in particular how they quarry them with the second layer.
@RafaelHe I think it's time I made a video on them in that case! I went to a coticule quarry last year and have a bag of the stuff in my sample cupboard.
The green beds at Charnwood are muddy silt mixed with volcanic ash that has then undergone low grade metamorphism. Which I've noticed is a bit of theme in sharpening stones.
The coticules are popular with the straight razor crowd, they're very intense about this sort of thing.
The Charnley Forest stones are sought after by that same crowd and other romantics that use old tools and methods.
There's little accurate information about what these stones actually are and how they formed.
Another stone that was used for sharpening in Europe in the 19th century was called a "Turkey stone", supposedly a Novaculite, but there are few reliable data on them.
@@geologyjohnson7700 the coticules with a slate backing are particularly popular.
Hi, I have a quartz question. Are you familiar with boxwork quartz? I believe that is what I have found, but I am having a hard time confirming it. Thanks
Yep, I know box work quartz, if you post a photo or video to your channel I can have a look. Test it by trying to scratch it with a steel point, quartz is harder than steel and wont scratch.
What about crystallized soft tissues? Like a crystal brain what type of quartz would that be ok I just heard the end of ur video did u make one about crystal fossils
When soft tissue is preserved, it's usually as organic carbon films or graphite. Some times it can be as clay minerals, particularly those rich in aluminium or iron. Pyrite can also preserve soft tissues too, but often not as well as clay or carbon. When quartz preserves soft tissue, it usually does so by encasing it rather than replacing it. Check out the fossils of the Rhynie chert, for an example. Quartz can replace hard parts like shells, and there are some lovely examples of this such as the silicified brachiopods from the Ordovician period of Ohio (I think near Cincinnati?)
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Cool
thanks!
I was wondering if you had a Tiktok?
I do, look for geology johnson, it's less serious than here but still solid geo facts
Just curious about minerals as a soil science student ...
Soils usually reflect the mineralogy of the underlying rock so thats a good idea!
I came to know more sir !! Thank you so much
This may be a silly question but lately I've been seeing a blue crystal being called chinese amazonite which doesn't look anything like amazonite other than it's colour. I did some digging and people said it's a microcrystalline. Do you know anything about this crystal, what it is, what it's actually called and if it's as valuable as russian amazonite? I think people also call it aqua chalcedony or Caribbean blue calcite (definitely not Caribbean blue calcite)
True Amazonite is a variety of the potasium feldspar called microcline. I've not heard of 'chinese amazonite' so don't know what it is for sure. Looking at the picutres on line, it looks like a mixture of different minerals - some gemstones are like this - jade for example is often a mix of serpentine, antigorite, omphacite and jadeite, it's very rarely pure jadieite. I found a few references for it online were analysis had show it was either stained quartz, stained resin or a mix of quartz and kaolinite. I will ask some of my pals who do mineral analysis for gem dealers if they have heard of it.
@@geologyjohnson7700 thankyou so much! This helps alot!
@@earthangel2800 So I asked around, and some chemical analysis on 'Chinese Amazonite' (using raman spectroscopy) have shown that it is microcrystaline quartz that has been stained with a dye.
@@geologyjohnson7700thankyou so much! i have a few pieces with hematite in them also (i believe it's hematite) so it's not purely man made, mainly just dyed? And what is the correct name for it as people call it by so many different things. Thankyou for answering this question many people wouldn't answer or give me a good answer.
@@earthangel2800 Yeah it's natural, just dyed. Microcrystaline quartz is called 'chalcedony' (and agate is just banded chalcedony). Haematite and other iron minerals are common inclusions in regular quartz and chalcedony - mostly produce reds, yellows and brown colours.