WrightwoodCalif.com Forum
Public Forums => San Gabriel Mtns Flora - Fauna => Topic started by: storm on Sep 24, 06, 11:23:47 AM
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a friend let me use his rock saw so that i could slice open a few local rocks. i hope that this can lead me to better understand the local geology...
meta-sediment (layers of limestone/calcite and quartzite--which can metamorphose into banded quartzite):
(http://img.photobucket.com/albums/v190/stormbythesea/rocks/cross-sectionmetasediment.jpg)
another meta-sediment, seemingly further along (metamorphically speaking) than the previous specimen. i believe that the white layers are nearly marble (metamorphosed from limestone), while the brown layers are nearly quartzite (metamorphosed from sandstone):
(http://img.photobucket.com/albums/v190/stormbythesea/rocks/cross-sectionmetasediment2.jpg)
banded quartzite:
(http://img.photobucket.com/albums/v190/stormbythesea/rocks/crosssection--bandedquartzite.jpg)
three specimens of calcite:
(http://img.photobucket.com/albums/v190/stormbythesea/rocks/crosssection--calcite1.jpg)
(http://img.photobucket.com/albums/v190/stormbythesea/rocks/crosssection--calcite2.jpg)
(http://img.photobucket.com/albums/v190/stormbythesea/rocks/crosssection--calcite3.jpg)
talc-magnesite-calcite-nephrite jade:
(http://img.photobucket.com/albums/v190/stormbythesea/rocks/crosssection--talcactinolitemagnesi.jpg)
nephrite jade:
(http://img.photobucket.com/albums/v190/stormbythesea/rocks/cross-sectionnephritejade.jpg)
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Nice photos!
Thanks Storm for sharing your knowledge :bow:
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When I was in the lapidary club at work I was learning to identify various types of rocks.
The samples you photographed all look like Leaverite.
Leav er right there! :2thumbsup:
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that first image of the layerd rock is awesome. i've never seen anything like that around here.
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all those rocks are scattered about in the levee that's below the Wright landslide.
here's one i found on saturday on the north side of Hwy. 2, down in one of the washes (sheep or heath?):
(http://img.photobucket.com/albums/v190/stormbythesea/rocks/Rhodonite.jpg)
i and others think this is rhodonite, which metamorphoses from impure limestone. if you know what the pink mineral/rock is, or if you've found some as well, i'd love to hear from you!
i've been told that a fellow had gone up Heath Canyon about 1000 feet and dug out about all the rhodonite he could find. i think this was back in the 1960s...
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Storm....nice photo's, and would like to cut some pieces myself.
I've found several specimens of the meta-sediment which I've found in my yard whil eplanting and while hiking.
One in particular that is indigenous to the W/W area and cool looking, is Actinolite, which I have collected several large and small. It would be interesting to see the interior structure.
http://www.mindat.org/min-18.html
A boy hood hobby was geology and I'm just starting to get back into it and can't find my hammer. ;D
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One in particular that is indigenous to the W/W area and cool looking, is Actinolite, which I have collected several large and small. It would be interesting to see the interior structure.
actinolite:
(http://img.photobucket.com/albums/v190/stormbythesea/rocks/cross-sectionactinolite.jpg)
actinolite schist:
(http://img.photobucket.com/albums/v190/stormbythesea/rocks/cross-sectionactinoliteschist.jpg)
i think these might be albite crystals:
(http://img.photobucket.com/albums/v190/stormbythesea/rocks/cross-sectionalbite.jpg)
i think this is diorite (form the Jensens area):
(http://img.photobucket.com/albums/v190/stormbythesea/rocks/cross-sectiondiorite.jpg)
here's a fine schist--notice the thin layers:
(http://img.photobucket.com/albums/v190/stormbythesea/rocks/cross-sectionfineschist.jpg)
gneiss from the Post Office area:
(http://img.photobucket.com/albums/v190/stormbythesea/rocks/cross-sectiongneiss.jpg)
black tourmaline in a schist:
(http://img.photobucket.com/albums/v190/stormbythesea/rocks/cross-sectiontourmaline.jpg)
some meta-sediment from Onyx Peak near Big Bear Lake:
(http://img.photobucket.com/albums/v190/stormbythesea/rocks/cross-sectionOnyxPeakmetasediment.jpg)
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on second thought, what i called albite crystals might be more diorite. the white mineral in diorite is plagioclase feldspar, while the black material is amphibole (as far as i understand)...
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These are great! My son and I are always picking up rocks and carting them home, but I don't know anything about them. Like Toolman, I used to love geology, including identifying rocks and minerals. I'd like to take up the hobby again, especially since it's something my 10-year-old and I would enjoy doing together.