1. Phenocryst 2. Vitreous 3. Vesicle 4. Cleavage 5. Twinning 6. Peat
Rocks and Minerals B/C
- OrigamiPlanet
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Re: Rocks and Minerals B/C
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Re: Rocks and Minerals B/C
OrigamiPlanet wrote:1. Phenocryst 2. Vitreous 3. Vesicle 4. Cleavage 5. Twinning 6. Peat
1. a crystal on a rock that is especially conspicuous 2. glassy or looking like glass 3. air pockets 4. a sharp division 5. two or more crystals forming within each other. 6. the lowest grade of coal, with lowest carbon concentration
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Re: Rocks and Minerals B/C
I'd make the following corrections:dxu46 wrote:OrigamiPlanet wrote:1. Phenocryst 2. Vitreous 3. Vesicle 4. Cleavage 5. Twinning 6. Peat1. a crystal on a rock that is especially conspicuous 2. glassy or looking like glass 3. air pockets 4. a sharp division 5. two or more crystals forming within each other. 6. the lowest grade of coal, with lowest carbon concentration
4. Cleavage is the way the atoms in a crystal split along weaker surfaces.
5. Multiple crystals in different orientations, sharing a common surface
6. Peat is the precursor of coal, it is organic matter that has not yet been metamorphosed.
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EMORY UNIVERSITY '22
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"One little Sciolyer left all alone,
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Congratulations to WW-P South/Grover for winning 2nd/1st place at NJ States!
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Re: Rocks and Minerals B/C
dxu46, you are still right to an extent, but I would prefer whythelongface's response with the last three as they are more accurate.whythelongface wrote:I'd make the following corrections:dxu46 wrote:OrigamiPlanet wrote:1. Phenocryst 2. Vitreous 3. Vesicle 4. Cleavage 5. Twinning 6. Peat1. a crystal on a rock that is especially conspicuous 2. glassy or looking like glass 3. air pockets 4. a sharp division 5. two or more crystals forming within each other. 6. the lowest grade of coal, with lowest carbon concentration
4. Cleavage is the way the atoms in a crystal split along weaker surfaces.
5. Multiple crystals in different orientations, sharing a common surface
6. Peat is the precursor of coal, it is organic matter that has not yet been metamorphosed.
Div. C - Cumberland Valley High School
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- whythelongface
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Re: Rocks and Minerals B/C
New question:
1. What is the defining characteristic of sedimentary rocks in a low-energy environment of formation? 2. What is SEDEX? 3. From what mineral does Kaolinite form from? 4. What is a metamorphic facies? Give an example. 5. Explain fractional crystallization.
WEST WINDSOR-PLAINSBORO HIGH SCHOOL SOUTH '18
EMORY UNIVERSITY '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!
EMORY UNIVERSITY '22
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"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!
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Re: Rocks and Minerals B/C
whythelongface wrote:New question:1. What is the defining characteristic of sedimentary rocks in a low-energy environment of formation? 2. What is SEDEX? 3. From what mineral does Kaolinite form from? 4. What is a metamorphic facies? Give an example. 5. Explain fractional crystallization.
1. Angular fragments 2. Sedimentary exhalative deposits 3. Feldspar (not sure which type of feldspar) 4. Distinct mineral assemblages resulting from different formation environments. Example: greenschist facies result from low grade metamorphism 5. Since minerals crystallize at different temperatures, certain minerals will crystallize as a melt cools and separate from the melt. It's one way that magmatic differentiation takes place.
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Re: Rocks and Minerals B/C
orangewhale wrote:whythelongface wrote:New question:1. What is the defining characteristic of sedimentary rocks in a low-energy environment of formation? 2. What is SEDEX? 3. From what mineral does Kaolinite form from? 4. What is a metamorphic facies? Give an example. 5. Explain fractional crystallization.1. Angular fragments 2. Sedimentary exhalative deposits 3. Feldspar (not sure which type of feldspar) 4. Distinct mineral assemblages resulting from different formation environments. Example: greenschist facies result from low grade metamorphism 5. Since minerals crystallize at different temperatures, certain minerals will crystallize as a melt cools and separate from the melt. It's one way that magmatic differentiation takes place.
Except 1; The answer to that one was "small sediment size". Think about it this way: in a high-energy EoF, such as a stream bed, fine sediments would be washed out of the system. An example of a low-energy EoF would be the bottom of a very still lake, where silt could accumulate.
WEST WINDSOR-PLAINSBORO HIGH SCHOOL SOUTH '18
EMORY UNIVERSITY '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!
EMORY UNIVERSITY '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!
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Re: Rocks and Minerals B/C
1. Describe idiochromatic, allochromatic, and pseudochromatic, and give an example of each. 2. What is the difference between a phenocryst and a porphyroblast?
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Re: Rocks and Minerals B/C
orangewhale wrote:1. Describe idiochromatic, allochromatic, and pseudochromatic, and give an example of each. 2. What is the difference between a phenocryst and a porphyroblast?
1. Idiochromatic - in which a mineral is colored due to its natural properties (e.g. malachite) Allochromatic - in which a mineral is accidentally colored due to impurities (e.g. quartz) Pseudochromatic - in which a mineral undergoes a color change because of optical and/or physical properties (e.g. tarnished bornite) 2. Rock type (phenocryst is in igneous, porphyroblast is metamorphic)
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