[img]http://rocks.comparenature.com/PImg/Anthracite25Med_300.jpg[/img]
1. Identify this specimen
2. What major group (Silicates, Hydroxides/Oxides, Igneous Rocks, etc.) does this specimen belong to?
3. Where is this most abundant?
1. Obsidian
2. Extrusive igneous rock
3. Usually where a lava flow meets water, as obsidian is formed by the extremely quick cooling of felsic lavas.
Incorrect, you want to look really carefully at the texture with this one. It's not glassy like obsidian. Yes it looks like obsidian, but this is what obsidian actually looks like, if you need it.
The image quality on this one isn't that great, which is probably why I jumped directly to obsidian. If it isn't, as you've stated, then my next guess would be coal of some sort, probably anthracite. That would make it a sedimentary rock found in areas where, a very long time ago, carbon-rich bogs and forests were.
I'm not sure that's correct either, it's kind of hard to tell from the image.
WESTWINDSOR-PLAINSBOROHIGHSCHOOLSOUTH'18 EMORYUNIVERSITY'22
SONT 2017 5th Place Medalist [Microbe Mission]
"One little Sciolyer left all alone,
He went out and hanged himself and then there were none."
Congratulations to WW-P South/Grover for winning 2nd/1st place at NJ States!
whythelongface wrote:The image quality on this one isn't that great, which is probably why I jumped directly to obsidian. If it isn't, as you've stated, then my next guess would be coal of some sort, probably anthracite. That would make it a sedimentary rock found in areas where, a very long time ago, carbon-rich bogs and forests were.
I'm not sure that's correct either, it's kind of hard to tell from the image.
Yea, I understand the quality isn't great, but then again not everything is always going to be easy. Your answer is right except for #2, it's actually not a sedimentary rock, it's a different type of rock. There's some controversy about anthracite, but from what I know, it isn't sedimentary.
Div. C - Cumberland Valley High School
Events
Astronomy; Codebusters; Dynamic Planet
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whythelongface wrote:I think the Official List has all varieties of coal under "Sedimentary".
It does, but when I was at PA states, they informed us of anthracite being a metamorphic rock, instead of sedimentary. That's what I was anticipating for as an answer, but I'll count anthracite as sedimentary.
Your turn now.
Div. C - Cumberland Valley High School
Events
Astronomy; Codebusters; Dynamic Planet
Howdy partner
Email me for anything! Aliases are HeeYaww and v_v_vle
[img]https://s-media-cache-ak0.pinimg.com/originals/88/b9/1d/88b91dda7bd9bbd79426efcc41579366.jpg[/img]
1. Name the mineral and provide its chemical composition.
2. Where is this mineral most commonly found?
3. What two qualities of this mineral make it slightly undesirable for jewelry?
WESTWINDSOR-PLAINSBOROHIGHSCHOOLSOUTH'18 EMORYUNIVERSITY'22
SONT 2017 5th Place Medalist [Microbe Mission]
"One little Sciolyer left all alone,
He went out and hanged himself and then there were none."
Congratulations to WW-P South/Grover for winning 2nd/1st place at NJ States!
[img]https://s-media-cache-ak0.pinimg.com/originals/88/b9/1d/88b91dda7bd9bbd79426efcc41579366.jpg[/img]
1. Name the mineral and provide its chemical composition.
2. Where is this mineral most commonly found?
3. What two qualities of this mineral make it slightly undesirable for jewelry?
1. Topaz, Al₂SiO₄(F,OH)₂
2. Brazil
3. It is very hard to fashion without damaging it, and the color fades after exposure to light.
[img]https://s-media-cache-ak0.pinimg.com/originals/88/b9/1d/88b91dda7bd9bbd79426efcc41579366.jpg[/img]
1. Name the mineral and provide its chemical composition.
2. Where is this mineral most commonly found?
3. What two qualities of this mineral make it slightly undesirable for jewelry?
1. Topaz, Al₂SiO₄(F,OH)₂
2. Brazil
3. It is very hard to fashion without damaging it, and the color fades after exposure to light.
Correct! Your turn, and make it a rock question, I'm worse at Rocks than Minerals...
WESTWINDSOR-PLAINSBOROHIGHSCHOOLSOUTH'18 EMORYUNIVERSITY'22
SONT 2017 5th Place Medalist [Microbe Mission]
"One little Sciolyer left all alone,
He went out and hanged himself and then there were none."
Congratulations to WW-P South/Grover for winning 2nd/1st place at NJ States!
[img]https://s-media-cache-ak0.pinimg.com/originals/88/b9/1d/88b91dda7bd9bbd79426efcc41579366.jpg[/img]
1. Name the mineral and provide its chemical composition.
2. Where is this mineral most commonly found?
3. What two qualities of this mineral make it slightly undesirable for jewelry?
1. Topaz, Al₂SiO₄(F,OH)₂
2. Brazil
3. It is very hard to fashion without damaging it, and the color fades after exposure to light.
Correct! Your turn, and make it a rock question, I'm worse at Rocks than Minerals...
Rocks it is.
[img]https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcSru7QRo8nXuknKIhz6tDFiHTAOAn48r1RdJ0zpWkgVU29y9idb[/img]
1. This image is an example of what rock under a microscope?
2. What are the individual pieces called?
3. Does this specimen effervesce?
4. What is the composition of this rock?
[img]https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcSru7QRo8nXuknKIhz6tDFiHTAOAn48r1RdJ0zpWkgVU29y9idb[/img]
1. This image is an example of what rock under a microscope?
2. What are the individual pieces called?
3. Does this specimen effervesce?
4. What is the composition of this rock?
1. Diatomite/Diatomaceous earth
2. Diatoms
3. No, because it is siliceous, not calcareous
4. Silicon tests of diatoms
WESTWINDSOR-PLAINSBOROHIGHSCHOOLSOUTH'18 EMORYUNIVERSITY'22
SONT 2017 5th Place Medalist [Microbe Mission]
"One little Sciolyer left all alone,
He went out and hanged himself and then there were none."
Congratulations to WW-P South/Grover for winning 2nd/1st place at NJ States!
