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1000 results for “silicatefondue”
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AlexStrekeisen.it (run by Alessandro Da Mommio) has some beautiful thin section images of titanite:
https://www.alexstrekeisen.it/english/pluto/titanite.php
#MinCup25 #ThinSectionThursday #Titanite #Sphene #Granite #Mineralogy
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AlexStrekeisen.it (run by Alessandro Da Mommio) has some beautiful thin section images of titanite:
https://www.alexstrekeisen.it/english/pluto/titanite.php
#MinCup25 #ThinSectionThursday #Titanite #Sphene #Granite #Mineralogy
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AlexStrekeisen.it (run by Alessandro Da Mommio) has some beautiful thin section images of titanite:
https://www.alexstrekeisen.it/english/pluto/titanite.php
#MinCup25 #ThinSectionThursday #Titanite #Sphene #Granite #Mineralogy
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Repost from last year:
I've seen sphene! (Sounds better than "the rock is tippsy with titanite")Centimeter-size black sphene (titanite) with apatite (dark brown) and orthoclase feldspar (light brown). Folding pocket knife for scale.
From the Bancroft locality in Ontario, Canada. Grenville-aged (~1.2± billion years)
#MinCup25 #Titanite #Sphene #Bancroft #Ontario #Geology #Grenville
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Repost from last year:
I've seen sphene! (Sounds better than "the rock is tippsy with titanite")Centimeter-size black sphene (titanite) with apatite (dark brown) and orthoclase feldspar (light brown). Folding pocket knife for scale.
From the Bancroft locality in Ontario, Canada. Grenville-aged (~1.2± billion years)
#MinCup25 #Titanite #Sphene #Bancroft #Ontario #Geology #Grenville
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Repost from last year:
I've seen sphene! (Sounds better than "the rock is tippsy with titanite")Centimeter-size black sphene (titanite) with apatite (dark brown) and orthoclase feldspar (light brown). Folding pocket knife for scale.
From the Bancroft locality in Ontario, Canada. Grenville-aged (~1.2± billion years)
#MinCup25 #Titanite #Sphene #Bancroft #Ontario #Geology #Grenville
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Repost from last year:
I've seen sphene! (Sounds better than "the rock is tippsy with titanite")Centimeter-size black sphene (titanite) with apatite (dark brown) and orthoclase feldspar (light brown). Folding pocket knife for scale.
From the Bancroft locality in Ontario, Canada. Grenville-aged (~1.2± billion years)
#MinCup25 #Titanite #Sphene #Bancroft #Ontario #Geology #Grenville
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Repost from last year:
I've seen sphene! (Sounds better than "the rock is tippsy with titanite")Centimeter-size black sphene (titanite) with apatite (dark brown) and orthoclase feldspar (light brown). Folding pocket knife for scale.
From the Bancroft locality in Ontario, Canada. Grenville-aged (~1.2± billion years)
#MinCup25 #Titanite #Sphene #Bancroft #Ontario #Geology #Grenville
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Claudia Zahn @Adrenochrome
has posted some astounding photos of #Wavellite over the last year. Below are two, but search the hashtag to see the whole collection! -
@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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@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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#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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We're awash in #tectosilicate structures this first half of the #MinCup25: five of the first sixteen, including two today.
A #zeolite and a #feldspathoid
Is tectosilirific a word?
Fair enough, they are the major rock-forming minerals of the crust!
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#Sanidine from the Fish Canyon Tuff is essential to understanding the pace of events in the #Cenozoic
High potassium, quickly erupted and cooled, and old enough to have accumulated sufficient 40Ar from radioactive decay. These crystals calibrate neutron flux for 40Ar/39Ar dating. The 28.2 Ma age of the FCT sanidine has been fine-tuned using #Milankovitch cycles of other ash beds in stable sedimentary basins.
photo from MinDat.org by Dan Polhemus
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#Sanidine from the Fish Canyon Tuff is essential to understanding the pace of events in the #Cenozoic
High potassium, quickly erupted and cooled, and old enough to have accumulated sufficient 40Ar from radioactive decay. These crystals calibrate neutron flux for 40Ar/39Ar dating. The 28.2 Ma age of the FCT sanidine has been fine-tuned using #Milankovitch cycles of other ash beds in stable sedimentary basins.
photo from MinDat.org by Dan Polhemus
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#Sanidine from the Fish Canyon Tuff is essential to understanding the pace of events in the #Cenozoic
High potassium, quickly erupted and cooled, and old enough to have accumulated sufficient 40Ar from radioactive decay. These crystals calibrate neutron flux for 40Ar/39Ar dating. The 28.2 Ma age of the FCT sanidine has been fine-tuned using #Milankovitch cycles of other ash beds in stable sedimentary basins.
photo from MinDat.org by Dan Polhemus
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#Sanidine from the Fish Canyon Tuff is essential to understanding the pace of events in the #Cenozoic
High potassium, quickly erupted and cooled, and old enough to have accumulated sufficient 40Ar from radioactive decay. These crystals calibrate neutron flux for 40Ar/39Ar dating. The 28.2 Ma age of the FCT sanidine has been fine-tuned using #Milankovitch cycles of other ash beds in stable sedimentary basins.
photo from MinDat.org by Dan Polhemus
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#Sanidine from the Fish Canyon Tuff is essential to understanding the pace of events in the #Cenozoic
High potassium, quickly erupted and cooled, and old enough to have accumulated sufficient 40Ar from radioactive decay. These crystals calibrate neutron flux for 40Ar/39Ar dating. The 28.2 Ma age of the FCT sanidine has been fine-tuned using #Milankovitch cycles of other ash beds in stable sedimentary basins.
photo from MinDat.org by Dan Polhemus
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#Leucite is used to make dental porcelain (or rather, leucite + glass from melting feldspar incongruently). Thiis is becuase it:
is immune system compatible
is machinable
is fracture resistant with low porosity
it doesn't easily stain or discolour
and most importantly, its thermal expansion matches the metal anchorImage from: J.R. Mackert et al (1986)The effect of the leucite transformation on dental porcelain expansion, Dental Materials 2: 32-36
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#Leucite is used to make dental porcelain (or rather, leucite + glass from melting feldspar incongruently). Thiis is becuase it:
is immune system compatible
is machinable
is fracture resistant with low porosity
it doesn't easily stain or discolour
and most importantly, its thermal expansion matches the metal anchorImage from: J.R. Mackert et al (1986)The effect of the leucite transformation on dental porcelain expansion, Dental Materials 2: 32-36