Repost: Kyanite isn't just a fetching blue mineral that documents the experience of sediments under extreme duress.
It's an ore: Virginia alone mined 83,000 tonnes in 2023. Kyanite in furnace insulation transforms to mullite when heated, expanding to reduce porosity and shrinkage.
Virginia Kyanite (photo: J. Wyman) from:
https://energy.virginia.gov/geology/Kyanite.shtml
A photo of a Cretaceous dyke intruding into Appalachian-deformed sedimentary rocks deposited in the lower Paleozoic: Earth history from 110 to almost 500 million years ago.
But #kyanite records more of the story: it's part of xenoliths brought to the surface by these dykes that document Grenville crust (1.1 billion years old) at depth.
See: Trzcienski: Kyanite-garnet-bearing Cambrian rocks and Grenville granulites from the Ayer's Cliff, Quebec... Geology (1989)
#MinCup25 #Quebec #Appalachians
Forillon: Land's End of the Appalachians
Forillon National Park marks the northern terminus of the Appalachian Mountains. The dramatic cliffs plunging into the Gulf of St. Lawrence are the very end of this ancient mountain chain. The park showcases a unique blend of marine and terrestrial ecosystems, where whales swim at the feet of forested peaks. #Canada #Forillon #Quebec #Appalachians 🇨🇦
Quite a bit of #Chrysotile was extracted from the Jeffrey Mine, Quebec. It is located on a line of oceanic lithosphere attached to North America during the growth of the Appalachians.
The town of Asbestos, home of the mine, has been renamed 'Val-des-Sources'.
Much of the expense of renovating buildings in Quebec is the cost of removing the asbestos insulation.
Forillon: Land's End of the Appalachians
Forillon National Park marks the northern terminus of the Appalachian Mountains. The dramatic cliffs plunging into the Gulf of St. Lawrence are the very end of this ancient mountain chain. The park showcases a unique blend of marine and terrestrial ecosystems, where whales swim at the feet of forested peaks. #Canada #Forillon #Quebec #Appalachians 🇨🇦
My new series leading up to the 250th Anniversary of the Declaration of Independence on July 4, 2026.
The American Revolution in Appalachia series will discuss the people, places, and events that were involved in creating a new nation. This is not focused on modern day #politics but telling all sides of how the Country became a #nation.
Episode one has been uploaded today: The Western Theater.
https://www.youtube.com/watch?v=uq9nP2ZUTmA
#DeclarationofIndependence #America #USA #Appalachia #Appalachians
Starting a new series of #shorts and short #documentaries on #Appalachia in the #American #Revolution leading up to the 250th anniversary of the signing of the Declaration of Independence.
The first short: Drummers in the American Revolution.
#AmericanRevolution #AmericanRevolutionaryWar #americanrevolution250 #Appalachians #Drummers #documentary #history
Bill Minarik
Sharing bits of Canada 'eh🇨🇦
Ancestry Roads
UselessFactsBadlyDrawn
Useless Facts, Badly Drawn