My backyard! I live in Covelo, CA. and try to wrap my head around how the Franciscan came into being. That graphic is a great illustration of those processes. I go hiking up a neat local canyon called Blueschist Narrows and I do find garnets in local rocks here. I'd upload a pic but I don't think substack has that option. Thanks for the article Richard!
I appreciate the description Richard. As I walked lake Michigan beaches I found a few rocks that I saw had calcite in them, more weathered that the equally white quartz veins, and broke and etched them to reveal small garnets and amphibole, maybe glaucophane, I'll have to check, but I'm away now. Here in Palawan there's plenty of blue amphibole in the ophiolites. Maybe glaucophane. But not DARK blue, like your cool stuff.
I have blue calcite and fluorellestadite fromCrestmore quarry. Have you written on that?
Thanks Mike. I haven't written about Crestmore, but I have had a nice blue calcite cleavage fragment for more than 50 years that I attribute to there. I think its associated greenish-brown material is vesuvianite rather than fluorellestadite. Maybe I'll work some more on it now... Thanks!
My backyard! I live in Covelo, CA. and try to wrap my head around how the Franciscan came into being. That graphic is a great illustration of those processes. I go hiking up a neat local canyon called Blueschist Narrows and I do find garnets in local rocks here. I'd upload a pic but I don't think substack has that option. Thanks for the article Richard!
Cool. Thanks. Right, I don't think anyone including me can put pics in comments here. Here's my previous attempt (with fear and trepidation) to explain the Franciscan: https://historyoftheearthcalendar.blogspot.com/2014/11/november-7-franciscan-melange.html
Cool, this is how I found you, your "History of the Earth" calendar is quite interesting and a real accomplishment! Thanks for the link Richard.
Thanks!
👍as always! Thanks, Dick.
I appreciate the description Richard. As I walked lake Michigan beaches I found a few rocks that I saw had calcite in them, more weathered that the equally white quartz veins, and broke and etched them to reveal small garnets and amphibole, maybe glaucophane, I'll have to check, but I'm away now. Here in Palawan there's plenty of blue amphibole in the ophiolites. Maybe glaucophane. But not DARK blue, like your cool stuff.
I have blue calcite and fluorellestadite fromCrestmore quarry. Have you written on that?
Thanks Mike. I haven't written about Crestmore, but I have had a nice blue calcite cleavage fragment for more than 50 years that I attribute to there. I think its associated greenish-brown material is vesuvianite rather than fluorellestadite. Maybe I'll work some more on it now... Thanks!