Showing posts with label garnet. Show all posts
Showing posts with label garnet. Show all posts

Monday, November 18, 2013

Garnet - The Stone Cold Bleeding Heart of Schist

Sometimes schist happens when you aren't expecting it. I was hiking along the Baltimore County side Patapsco river yesterday. I saw outcropping ledge of stone high above the ruins of of the old mill town of Daniels, aka Alberton and Elysville. I climbed up to investigate what I thought might be a nice place of shelter or hibernation for wildlife. As I was getting ready to descend, at the end of the rock I noticed a different smaller stone formation that looked like schist and also looked like it was bleeding. At first I though maybe an animal had been eating berries or a bird had made a deposit on the stone.But closer inspection revealed small red-brown crystals imbedded in the white-gray schist. Where is your rock hammer when you need it? In the trunk of your car two miles away, of course! I wasn't looking for schist or garnets and certainly did not expect to stumble on any. But I did have my cameras. So I captured some slow moving specimens of rock on digital media. My geology guru, Ira, a professional geologist confirmed the garnet schist identification.

My brother Chris, like Old Sparky whispering in my ear suggested: "Quick, buy up the land. We'll mine it, declare bankruptcy....get a bailout and run off with the money! It's the new American capitalism." I'm thinking. It's not the mother load. It's a load of schist. But we could spread stock around like manure. Don't tempt me.


The first photo, above, is of a broken off vein of schist. The piece probably fell long ago, since it is securely planted in the ground and tree is growing next to it. It was likely once a section of a horizonat ledge seen in the third photo.It looks like it's bleeding. The photo below is cropped emlargement focused on one red section.


Below is a close up of an intact horizontal vein of schist showin a few garnet cystals if you look closely.


And finally below is a photo of a small section from the vein above, which I removed. It show a nice garnet gembedded in the schist.





Sunday, July 21, 2013

Geologizing

The Prospector's Dilema



The second leg of this morning's hike in Leakin Park, the leg south of Windsor Mill Road on the east side of the Gwynn's Falls was a prospecting expedition. I was looking for an outcrop of schist rock studded with garnets, which I heard about at a presentation I attended a few weeks ago. My mission was an epic geological fail. Ok, not epic. I found outcrops, but did not see or recognize any garnets, I am not even sure if the outcrops were schist or some other kind of rock, such as gneiss or granite or a combination of the three. So, like many prospectors before me, I know that there are garnets (undoubtedly industrial grade, so don't get all excited) in them thar hills, but I could not find them. Or worse, I found them, but did not recognized them. This calls for a return trip with my rock guru, Ira, preferably in the late fall, when the leaves are off the trees and vines that cover a lot of the rocks. My experience is that when looking for structures (natural or man made) in a forest, I am more likely to find them in winter when the trees and vines are bare. There are more photos of the rocks I saw here.

p.s. Unpon review of the photos, Ira said I was in the schist, but agreed that closer inspection should wait until the end of fall when the rocks are clear of leaves.