16 November 2011
Labradorite is mineral du jour
Posted by Callan Bentley
Other members of the geoblogosphere have been posting brief image-heavy missives on labradorite over the past 24 hours. Collectively, they remind me that I’ve got a backlog of photos from the Adirondacks of upstate New York to share. Here are a few scans of cut and polished cobbles of the anorthosite from the Adirondack Massif, including bluish crystals of labradorite.
What I find most lovely about these, though, is not the abundant plagioclase, but the “necklaces” of garnet which ring the pyroxenes. Here’s the other half of the sample imaged above:
And a close-up of the garnet reaction rims mantling the greenish pyroxenes;
One more: a weathered sample, tinged throughout with rust:
[…] this rock as well. Check out the blogs of Ron Schott, Garry Hayes, Dana Hunter, Ian G. Stimpson, Callan Bentley, Ryan Jackson, and Mika McKinnon who participated in this geomeme. Please let me know if I missed […]