blondebrainpower · a day ago
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Iron Pyrite
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bigfuckingrocksofficial · 2 days ago
Remember; when you’re solemnly kicking a rock down the road you’re not alone :) you’ve got the rock to keep you company :) and you’re kicking the shit out of it :) stop :) ow ;)
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house-ad · 6 months ago
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dr-alex-mr-panda · a day ago
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Geological layers (2022)
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transdumpsterfire · 2 days ago
Do you know what kind of rock this is?
I think it is forged in fire (metamorphic?) as this is the site of an ancient volcano and it looks a bit like when you bake cookies but havent mixed the sugar in well enough so the granules are visible and kinda melty.
It has a large band of quarts at the top and a dark patch at the bottom - the notebook it is resting on is A5 if you need to guage the scale
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To me, that looks like quartzite. And your description does confirm that. Quartzite is a metamorphic rock, and the protolith (parent rock) for quartzite is a quartz sandstone.
While you're correct about the fact that the rock is metamorphic, you're a little off about the history of this specimen.
The quartz sandstone protolith was likely originally deposited on an environment like a sandy beach. Over time, tectonics and other layers of sediment being deposited above put pressure on the sand layer, causing diagenesis (the process of sediments becoming a solid rock). At this point, the quartz sandstone protolith would look very coarse grained, like a bunch of grains of sand lightly fused together, and it may have been possible to rub individual grains off with a gentle touch.
Over eons, the forces of tectonics forced the sandstone deeper into the crust, where it experienced immense temperature and pressure. The force and temperature began to partially melt the grains, and the grains began to fuse with other grains at their edges. If you can see each individual grain like you said, then that means that the metamorphic process ended at this stage, and the rock did not go deeper to cause the grains to completely fuse and deform. Again over eons, the same tectonic forces that forced the sandstone down began lifting it to the surface, and erosion exposed it at the surface, where you found it in present day.
The heat of a volcano is enough to melt rocks, but in a volcano there is not enough pressure, and heat alone cannot take a sandstone through the metamorphic process.
Probably more detail than you were looking for, but I'm in an explain-y mood today. Thanks sharing your rock!
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vintagrafica · a day ago
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Silex Fragilis
"British Mineralogy" by James Sowerby, 1807
Available now on Society6 or Redbubble
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despite-everything · 5 months ago
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just found the funniest stickers to put on my car
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1five1two · 7 months ago
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Agate with flower fossils.
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vangoghcore · 4 months ago
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by koroit.opal
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shitacademicswrite · a month ago
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poetry-siir · 7 months ago
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I would have done anything for you, all I wanted was for you to ask.
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sub-at-omicsteminist · 4 months ago
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Astronomy I-
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mindblowingscience · a year ago
Within a diamond hauled from deep beneath Earth's surface, scientists have discovered the first example of a never-before-seen mineral.
Named davemaoite after prominent geophysicist Ho-kwang (Dave) Mao, the mineral is the first example of a high-pressure calcium silicate perovskite (CaSiO3) found on Earth. Another form of CaSiO3, known as wollastonite, is commonly found across the globe, but davemaoite has a crystalline structure that forms only under high pressure and high temperatures in Earth's mantle, the mainly solid layer of Earth trapped between the outer core and the crust.
Davemaoite has long been expected to be an abundant and geochemically important mineral in Earth's mantle. But scientists have never found any direct evidence of its existence because it breaks down into other minerals when it moves toward the surface and pressure decreases. However, analysis of a diamond from Botswana, which formed in the mantle around 410 miles (660 kilometers) below Earth's surface, has revealed a sample of intact davemaoite trapped inside. As a result, the International Mineralogical Association has now confirmed davemaoite as a new mineral.
Continue Reading.
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weaver-z · a year ago
Everyone be quiet and look at this picture my professor used to teach us rock identification in geology:
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theoldbone · a year ago
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Forbidden candy- Gobi desert agates
These have been tumbled in the desert creating their round shape and strange texture
Part II
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headspace-hotel · a year ago
So I wanted to know what kind of crystal could go in a wizard staff, right? so I googled “big crystal,” as one does, and got an Etsy ad for This
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And as you all know I Am currently taking a geology class, so I am probably more emotionally invested in minerals than usual. But that is...very obviously not a natural crystal.
So I did some looking around on Etsy.
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Now, these shops all seem to advertise to the “witchy”/“spiritual healing” type of person. And there are a lot of them. Crystals are a Big Thing on Etsy. And ALMOST ALL of them are obviously artificially cut into the same sort of prism with a triangular pyramid top, regardless of the actual sort of crystal it is supposed to be.
Even like, fucking, obsidian. Obsidian is volcanic glass, it doesn’t form crystals at all, it is not a crystal
I’m not throwing any shade at people who are into crystals for like witchy reasons, but it really seems like if crystals are spiritually important to you, you should know what a crystal is...right...?
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ochipi · 6 months ago
Weird things I have done as an archaeologist
Washing cannonballs
Comparing human leg bones to my leg
Balancing knee caps to see if they’re left or right
Smashed my head on a drill handle while I tried to look cool dropping 3 meters of stainless steel down a hole
Trying to rescue mice out of the trench using a shovel and screaming how you’re trying to help
Glass still cuts skin, even after 500 years. And me being the dumbass I am to swipe my finger across to clean it
Getting distracted because you’re convinced these two pottery shards match in some place
Pushing my thumb into the decorative indentation a potter has made 300 years ago cuz I’m still a child
Trying to match shoe prints to one of your colleagues
Surely google knows the brand name on this 100 year old shoe shine can
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