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Morgan
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[*] posted on 26-1-2014 at 17:07


Some purple rocks.


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Morgan
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[*] posted on 26-1-2014 at 17:16


Some kind of green rock. I don't know what it is.


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[Edited on 27-1-2014 by Morgan]

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[*] posted on 26-1-2014 at 17:38


Some curvy things. They're quite heavy. You can see a porousness to them.


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[*] posted on 26-1-2014 at 17:44


Kind of a clay sandstone material?



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Morgan
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[*] posted on 26-1-2014 at 17:57


I'm not sure what to call this. It appears to be a fine clay-like layering but hard now with a slight ring to it if you tap the thin pieces.

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Morgan
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[*] posted on 26-1-2014 at 18:14


I wonder where this stuff comes from? You see it all over as round polished gift shop stuff. Still it's kind of nice. I would like to explore the Burgess Shale Formation I think.


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Morgan
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[*] posted on 26-1-2014 at 18:30


Looks like petrified wood. They're very heavy.


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[Edited on 27-1-2014 by Morgan]
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[*] posted on 26-1-2014 at 18:47


Quote: Originally posted by Morgan  
Some kind of green rock. I don't know what it is.




[Edited on 27-1-2014 by Morgan]


That looks like aventurine. It's a type of quartz




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[*] posted on 26-1-2014 at 18:58


More of my outdoor rocks, a hodgepodge of commoners I suppose. The tiger eye dabbed with a little water for picture day. I don't know the names of the picture 48 group or what they may be.

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Morgan
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[*] posted on 26-1-2014 at 19:34


This is a simple little rock or mineral but not much in the way of clues other than if you wet it, you can sort of see into it somewhat, or not opaque if you polished it. But it's a very dark green, that's about it. It would be glassy if polished, no grains in it.

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[*] posted on 26-1-2014 at 19:51


Jade? More aventurine? Green quartz?



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[*] posted on 26-1-2014 at 20:11


Morgan, I think the one that looks like it has been fractured or shifted is dolomite, is has slightly rounded crystal faces. Could the one with orange stripes be banded iron?
Here is the Wikipedia on dolomite. An easy way to test for it is simply to drop some dilute HCl on it, if no gas is evolved it could be dolomite.




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[*] posted on 26-1-2014 at 20:12


Also the "curvy things" look like petrified wood...



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[*] posted on 26-1-2014 at 23:57


Quote: Originally posted by Morgan  
This is a simple little rock or mineral but not much in the way of clues other than if you wet it, you can sort of see into it somewhat, or not opaque if you polished it. But it's a very dark green, that's about it. It would be glassy if polished, no grains in it.


Mtorolite? It's a type of chalcedony; yours seems too dark though. Actually, now that I think of it, your previous green mineral might be mtorolite. The furthest right in the group of three rocks you showed looks like some sort of chalcedony as well.




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[*] posted on 27-1-2014 at 11:55


I wonder what causes this crinkle effect, as if the surfaces were melted and pressed against something?

[Edited on 27-1-2014 by Morgan]

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[*] posted on 27-1-2014 at 12:13


A smooth rock of some sort.


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[*] posted on 27-1-2014 at 12:41


The camera didn't capture the sheen this slate-like rock had. It also had more of a green tint. I couldn't get the angle right in the sunlight.

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[*] posted on 27-1-2014 at 12:52


Looks like a <a href="http://en.wikipedia.org/wiki/Garnet" target="_blank"">garnet</a> <img src="../scipics/_wiki.png" /> <a href="http://en.wikipedia.org/wiki/Phyllite" target="_blank">phyllite</a> <img src="../scipics/_wiki.png" />. Can you post a photo taken through a magnifier of one of the garnets?

Here's an example of an <a href="http://en.wikipedia.org/wiki/Almandine" target="_blank">almandine</a> <img src="../scipics/_wiki.png" /> <a href="http://en.wikipedia.org/wiki/Staurolite" target="_blank">staurolite</a> <img src="../scipics/_wiki.png" /> <a href="http://en.wikipedia.org/wiki/Schist" target="_blank">schist</a> <img src="../scipics/_wiki.png" /> for comparison:
<a href="http://www.flickr.com/photos/35937732@N02/11989849993/" title="Almandine Staurolite Schist by bfesser, on Flickr" target="_blank"><img src="http://farm4.staticflickr.com/3727/11989849993_fd01a1b7ac_m.jpg" width="240" height="180" alt="Almandine Staurolite Schist"></a> <a href="http://www.flickr.com/photos/35937732@N02/11989546955/" title="Almandine Staurolite Schist by bfesser, on Flickr" target="_blank"><img src="http://farm8.staticflickr.com/7355/11989546955_d085e9851a_m.jpg" width="240" height="180" alt="Almandine Staurolite Schist"></a>

[Edited on 27.1.14 by bfesser]




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[*] posted on 27-1-2014 at 13:21


I was thinking it was garnet too remembering another rock I have and a previous post of yours of a rock face loaded with them. Funny I didn't notice the flecks until I saw my own photo of them, but that characteristic stands out once you are used to seeing it. I can photograph it using my magnifying lens yes, I can't tell you how many times I wished I had a macro lens.

[Edited on 27-1-2014 by Morgan]
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[*] posted on 28-1-2014 at 15:45


Here is a cool metamorphic rock studded with garnet porphyroblasts that I found up at my cottage during the summer. I'm not exactly sure whether the host rock would be classed as a gneiss or a granulite, although I think that it seems more like a granulite.

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[*] posted on 28-1-2014 at 16:15


Here are a few really cool features that I found up at my friend's place near Parry Sound during the summer.

The first image is of a highly metamorphosed, folded, mafic dike (amphibolite) that cuts through some sort of felsic granulite.

The second image, from the same area, shows at least four different geological processes: (this is my opinion)

1. The creation of the felsic granulite
2. The intrusion of a mafic dike, presumably diabase or gabbro at that point in time (middle left to top right)
3. The metamorphosis of said dike into amphibolite
4. Finally, the relatively more recent intrusion of a pegmatite dyke (across the center)

The third image is another example of the second (the wide amphibolite dike curves from bottom right to top left; the pegmatite dike cuts across the center dipping slightly to the left)

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[*] posted on 29-1-2014 at 13:23


Quote: Originally posted by Morgan  
I wonder what causes this crinkle effect, as if the surfaces were melted and pressed against something?

[Edited on 27-1-2014 by Morgan]


Left one might be Amber? If so that's a nice big natural chunk of it!

I think Oregon is a good bet for the source of most of these. I had a friend that carted home an essentially identical collection to yours while hiking around south-central WA. I helped him clean & organize them later.

Cleaning sometimes involved a fun trick I found online somewhere:
1: Drop your specimen(s) into an HCl bath
2: Tear a sheet of aluminum foil into strips
3: Add foil strips to HCl bath. Observe vigorous redox rxn.
4: Fish out your specimens & observe what remains

Was pretty interesting to see what survived. Worked great for cleaning dirt or rock off of crystal formations. But sometimes destroyed the whole specimen :(




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[*] posted on 29-1-2014 at 17:02


I too thought it might be <a href="https://en.wikipedia.org/wiki/Amber" target="_blank">amber</a> <img src="../scipics/_wiki.png" />, but I don't know what rough amber looks like&mdash;I've never seen it myself.

blargish, great outcrop photos. Thanks for sharing.
Quote: Originally posted by Morgan  
I was thinking it was garnet too remembering another rock I have and a previous post of yours of a rock face loaded with them.
Morgan, I don't recall ever posting such a photo (before this thread). Any chance you could link to it?

I tried taking photos of some of my mica schist specimens a few days ago, but my camera battery died before I got up to the good specimens from the <a href="http://www.mindat.org/loc-22519.html" target="_blank">Black Hills, SD</a> <img src="../scipics/_ext.png" />. I also lament that I don't have a proper macro lens (or a DSLR, for that matter). Regardless, here are a few related specimens I managed to photograph:

<table><tr><td><a href="http://www.flickr.com/photos/35937732@N02/12179197094/" title="Staurolite Almandine Schist by bfesser, on Flickr" target="_blank"><img src="http://farm4.staticflickr.com/3698/12179197094_33ee170264_m.jpg" width="240" height="180" alt="Staurolite Almandine Schist"></a></td><td><a href="http://www.flickr.com/photos/35937732@N02/12179030033/" title="Staurolite Almandine Schist by bfesser, on Flickr" target="_blank"><img src="http://farm4.staticflickr.com/3793/12179030033_db9435a164_m.jpg" width="240" height="180" alt="Staurolite Almandine Schist"></a></td></tr><tr><td align="center">Staurolite Almandine Schist<br />(Specimen 1)</td><td align="center">Staurolite Almandine Schist<br />(Specimen 1)</td></tr></table>
<table><tr><td><a href="http://www.flickr.com/photos/35937732@N02/12179227964/" title="Almandine Staurolite Schist by bfesser, on Flickr" target="_blank"><img src="http://farm8.staticflickr.com/7399/12179227964_cdb2a5ac77_m.jpg" width="240" height="180" alt="Almandine Staurolite Schist"></a></td><td><a href="http://www.flickr.com/photos/35937732@N02/12179259274/" title="Staurolite Twin in Almandine Schist by bfesser, on Flickr" target="_blank"><img src="http://farm8.staticflickr.com/7291/12179259274_c927716420_m.jpg" width="240" height="180" alt="Staurolite Twin in Almandine Schist"></a></td></tr><tr><td align="center">Almandine Staurolite Schist<br />(Specimen 2)</td><td align="center">Staurolite Twin in Almandine Schist<br />(Specimen 2)</td></tr></table>
<table><tr><td><a href="http://www.flickr.com/photos/35937732@N02/12178837195/" title="Staurolite Twin by bfesser, on Flickr" target="_blank"><img src="http://farm4.staticflickr.com/3773/12178837195_8a4969005e_m.jpg" width="240" height="180" alt="Staurolite Twin"></a></td><td><a href="http://www.flickr.com/photos/35937732@N02/12179088843/" title="Almandine Dodecahedra by bfesser, on Flickr" target="_blank"><img src="http://farm3.staticflickr.com/2810/12179088843_6dbfec193d_m.jpg" width="240" height="180" alt="Almandine Dodecahedra"></a></td></tr><tr><td align="center">Staurolite Twin</td><td align="center">Almandine Dodecahedra</td></tr></table>

And just because I feel like it:

<table><tr><td><a href="http://www.flickr.com/photos/35937732@N02/12178491735/" title="Amethyst by bfesser, on Flickr" target="_blank"><img src="http://farm4.staticflickr.com/3824/12178491735_8ba2203a56_m.jpg" width="240" height="180" alt="Amethyst"></a></td><td><a href="http://www.flickr.com/photos/35937732@N02/11989798373/" title="Outcrop by bfesser, on Flickr" target="_blank"><img src="http://farm6.staticflickr.com/5539/11989798373_1ee0d177a7_m.jpg" width="240" height="180" alt="Outcrop"></a></td></tr></table>




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[*] posted on 29-1-2014 at 17:50


I just started looking at these. The first were the mineral fluorite... good examples too... typical colors are white, violet-purple and green. The purple kind is easily confused with amethyst until you scratch it. The curvy looking things are castings.. desert environment. I'll read up on the gensis and get back to you.



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[*] posted on 29-1-2014 at 19:08


bfessor I must have spaced out thinking you posted some previous garnet pictures. The amber looking rock is too heavy to be amber but the crinkle effect and color does look like it.
I was looking at/enlarging the photo of the big, smooth, slate blue rock again and the curved lines around the ends almost make it look like a petrified wood.

Some other rocks, last of the pile. And so concludes this collection of misfit rocks, rocks that weren't showy enough to be indoors. Individually each one didn't have much appeal to me, but now that I look at them collectively, they do.

Thanks again to all for all the interesting comments.


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[Edited on 30-1-2014 by Morgan]
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