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1000 results for “silicatefondue”
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@Kaetchi I am not very knowledgeable about the Congo Copper Belt. Congo has very old copper-rich rocks (the Katanga Supergroup, 700-800 million year-old sediments). Malachite forms when underground water rich in CO2 reacts with existing copper minerals. Congo has not been glaciated for a long time, so that shallow-formed malachite is still preserved.
Others who know more may pipe up or correct what I've written.
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@Kaetchi I am not very knowledgeable about the Congo Copper Belt. Congo has very old copper-rich rocks (the Katanga Supergroup, 700-800 million year-old sediments). Malachite forms when underground water rich in CO2 reacts with existing copper minerals. Congo has not been glaciated for a long time, so that shallow-formed malachite is still preserved.
Others who know more may pipe up or correct what I've written.
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@Kaetchi I am not very knowledgeable about the Congo Copper Belt. Congo has very old copper-rich rocks (the Katanga Supergroup, 700-800 million year-old sediments). Malachite forms when underground water rich in CO2 reacts with existing copper minerals. Congo has not been glaciated for a long time, so that shallow-formed malachite is still preserved.
Others who know more may pipe up or correct what I've written.
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#Azurite can form in the oxidized supergene zone of copper-rich rocks. More carbon dioxide favors azurite over #malachite. Our atmosphere doesn't have enough CO2 (yet) to stabilize azurite, but malachite at the surface persists kinetically rather than convert to black copper oxide. Sulfur and other species can modify these relations.
Hence copper roofs weather to green, not blue!
Diagram from Kiselcva et al. (1992)
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#Azurite can form in the oxidized supergene zone of copper-rich rocks. More carbon dioxide favors azurite over #malachite. Our atmosphere doesn't have enough CO2 (yet) to stabilize azurite, but malachite at the surface persists kinetically rather than convert to black copper oxide. Sulfur and other species can modify these relations.
Hence copper roofs weather to green, not blue!
Diagram from Kiselcva et al. (1992)
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#Azurite can form in the oxidized supergene zone of copper-rich rocks. More carbon dioxide favors azurite over #malachite. Our atmosphere doesn't have enough CO2 (yet) to stabilize azurite, but malachite at the surface persists kinetically rather than convert to black copper oxide. Sulfur and other species can modify these relations.
Hence copper roofs weather to green, not blue!
Diagram from Kiselcva et al. (1992)
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The Bandelier Tuff (New Mexico) ejected perhaps 800 cubic km of magma and rock in two events a little over 1 million years ago.
Trace elements in #quartz make it glow in an electron beam (cathode luminescence). The outer bright blue rims in CL record crystallization temperatures (from Ti concentrations) abruptly 100°C hotter than before: magma recharge triggering a #supereruption.
Jack Wilcock's M.Sc. work (John Stix's group).
#MinCup23 #Caldera #Volcano #NewMexico #LAICPMS #CL -
A description of #Haüyne fluorescence at: https://gemologyproject.com/wiki/index.php?title=Hauyne
These samples are found in a quarry near the Laacher See (Eifel Mts, Rhineland-Palatinate, Germany)
This crater was formed only ~13,000 years ago in an eruption similar in size to the 1991 Pinitubo eruption -in central Europe!
#MinCup25 #hauyne #LaacherSee #EifelMountains #Germany #Volcano
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A description of #Haüyne fluorescence at: https://gemologyproject.com/wiki/index.php?title=Hauyne
These samples are found in a quarry near the Laacher See (Eifel Mts, Rhineland-Palatinate, Germany)
This crater was formed only ~13,000 years ago in an eruption similar in size to the 1991 Pinitubo eruption -in central Europe!
#MinCup25 #hauyne #LaacherSee #EifelMountains #Germany #Volcano
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A description of #Haüyne fluorescence at: https://gemologyproject.com/wiki/index.php?title=Hauyne
These samples are found in a quarry near the Laacher See (Eifel Mts, Rhineland-Palatinate, Germany)
This crater was formed only ~13,000 years ago in an eruption similar in size to the 1991 Pinitubo eruption -in central Europe!
#MinCup25 #hauyne #LaacherSee #EifelMountains #Germany #Volcano
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A description of #Haüyne fluorescence at: https://gemologyproject.com/wiki/index.php?title=Hauyne
These samples are found in a quarry near the Laacher See (Eifel Mts, Rhineland-Palatinate, Germany)
This crater was formed only ~13,000 years ago in an eruption similar in size to the 1991 Pinitubo eruption -in central Europe!
#MinCup25 #hauyne #LaacherSee #EifelMountains #Germany #Volcano
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A description of #Haüyne fluorescence at: https://gemologyproject.com/wiki/index.php?title=Hauyne
These samples are found in a quarry near the Laacher See (Eifel Mts, Rhineland-Palatinate, Germany)
This crater was formed only ~13,000 years ago in an eruption similar in size to the 1991 Pinitubo eruption -in central Europe!
#MinCup25 #hauyne #LaacherSee #EifelMountains #Germany #Volcano
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The pillow rinds have preferentially weathered, outlining the basalt pillows formed at least 3.75 and perhaps as long ago as 4.3 billion years ago. Now metamorphosed to amphibolite grade. In the Ujaraaluk unit of the Nuvvuagittuq Greenstone Belt, near #Inukjuak, northern #Quebec. #McGill University #EarthSystemScience #PillowBasalt #Hadean 1/2
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The length of Earth's day is stable due to dozens of counter-rotating Kugel fountains all over the globe. It's only a meter in diameter, but is spinning much faster than the Earth!
Martin-Luther-Platz, Dresden, Germany
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Ray Price’s death was announced last week.
Ray’s mapping in the Canadian Rockies was instrumental in advancing our understanding of lithosphere dynamics and mountain building. A description of Ray’s career can be found in his Penrose award citation.
https://www.geosociety.org/awards/12speeches/penrose.htmThis is a synopsis of memorials by
Christopher Spencer and Laurent Godin of Queen’s University, Ontario#Geology #Tectonics #Canada #QueensUniversity #CanadianRockies
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Titled either "Deferred Maintenance" or "Urban Reclamation"
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#Neptunite can have solid solution substitutions. The photo below is of a manganese-rich neptunite from Mont Saint-Hilaire. Photo by dakotamatrix dot com
#MinCup23 #Quebec -
#Neptunite can have solid solution substitutions. The photo below is of a manganese-rich neptunite from Mont Saint-Hilaire. Photo by dakotamatrix dot com
#MinCup23 #Quebec -
#Neptunite can have solid solution substitutions. The photo below is of a manganese-rich neptunite from Mont Saint-Hilaire. Photo by dakotamatrix dot com
#MinCup23 #Quebec -
#Neptunite can have solid solution substitutions. The photo below is of a manganese-rich neptunite from Mont Saint-Hilaire. Photo by dakotamatrix dot com
#MinCup23 #Quebec -
#Neptunite can have solid solution substitutions. The photo below is of a manganese-rich neptunite from Mont Saint-Hilaire. Photo by dakotamatrix dot com
#MinCup23 #Quebec -
2.5 stars: The paint withstood 18 consecutive winters but couldn't handle two years of raccoon urine.
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Spring snow shadowed from the strong spring sun.
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A bit of red on a white day
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Sorena Sorensen was profiled in the Smithsonian Magazine in 2019:
"Get to Know the Leading Ladies of Science at the Smithsonian". Article by Anna Torres and illustrations by Eric Liu (an intern at the time). -
The ground we live on is the top of a moving rock area that is really hot. The ground we live on is broken up into little rocks. Sometimes the little rocks move on top of each other. This makes the rocks get really tall. Sometimes one goes under the other one. The under rock gets really hot and becomes the moving rock under the ground. The moving rock under us sometimes comes up through the ground making new hot rock. [J. G.]
#PlateTectonics #UpGoer5 #EarthSystemScience #McGillUniversity -
Upon death, living things either break down as the surrounding air, in a way, quickly eats up what is left of them or, they get covered under ground when not broken down. As the ground layer above gets bigger and heavier, the remains are pressed into a different and thicker form of matter. It takes a lot of time for the ground layer to grow heavy enough to change the state of the matter in such a way. Those old remains can then be burnt for power.
[V. B.]
#FossilFuels #UpGoer5 #McGillUniversity -
The really big ball that we live on is made of huge pieces of ground that move around. Sometimes they knock into each other, run away from each other, or slip side to side. If two of them get stuck, power builds up in the rock and lets go as they are set free. The ground shakes a lot, large cracks form, rocks might slip down, and houses fall. If that happens in the big water area, a very tall wave will move onto the land and run into it. [M. T.]
#Earthquake #UpGoer5 #McGillUniversity