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Unusual face (Read 3911 times)
Scott LaBorde
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Unusual face
Jul 9
th
, 2014 at 6:00pm
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This is an interesting face.
z24.JPG
( 345 KB | 113 Downloads )
JonesFranklin3.jpg
( 404 KB | 118 Downloads )
JonesFranklin5.jpeg
( 719 KB | 110 Downloads )
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Laurie Adams
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Re: Unusual face
Reply #1 -
Jul 9
th
, 2014 at 6:14pm
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Wow that is very cool! It reminds me of some of the "white cap" crystals that came from Kersey Valley in Guilford County, NC, that have a glass clear central core, with a rind of milky quartz. Of course the clear quartz is pure, and a period of interrupted growth allowed inclusions of fluids and gasses to incorporate within the quartz cap and give it that milky look. It's interesting that the amount of gas and fluid inclusions not only determines how milky the quartz is, it also influences the form of the crystals. Nice photos.
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JoeM
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Re: Unusual face
Reply #2 -
Jul 9
th
, 2014 at 11:38pm
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Great pictures, Scott!
Very interesting crystal. It looks like something was "glued"
with rubber cement to that surface and peeled away.
Not saying that's what happened,... just saying it "looks like".
And the straight line negative?
Really good pictures, Scott.
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Scott LaBorde
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Re: Unusual face
Reply #3 -
Jul 10
th
, 2014 at 11:35pm
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Here are several more pictures of specimens mainly found at the Silver Lake location in Raleigh, NC. I took these photographs with the intention of emphasizing the unusual beveled faces found on many tessin habit quartz crystals. I believe the bevels consist of a combination of "s" and other intermediate type faces.
Look here for reference into "s" faces:
http://www.quartzpage.de/crs_intro.html
«
Last Edit: Jul 16
th
, 2014 at 1:29pm by
Scott LaBorde
»
z35.JPG
( 219 KB | 121 Downloads )
z36.JPG
( 302 KB | 131 Downloads )
z37.JPG
( 289 KB | 104 Downloads )
z38.JPG
( 259 KB | 119 Downloads )
z39.JPG
( 253 KB | 116 Downloads )
z40.JPG
( 211 KB | 106 Downloads )
z41.JPG
( 211 KB | 117 Downloads )
z42.JPG
( 291 KB | 135 Downloads )
z43.JPG
( 307 KB | 120 Downloads )
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Scott LaBorde
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Re: Unusual face
Reply #4 -
Jul 10
th
, 2014 at 11:37pm
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And a couple close-ups of these curious beveled edges.
«
Last Edit: Jul 16
th
, 2014 at 1:29pm by
Scott LaBorde
»
faces12.JPG
( 433 KB | 121 Downloads )
faces13.JPG
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JoeM
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Re: Unusual face
Reply #5 -
Jul 14
th
, 2014 at 10:43pm
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I'm really enjoying these pictures, Scott!
Of course it is very hard to claim the derivation for each and every one of these anomalous faces
but I think you will have to agree, having seen many in situ
growing amongst the mica, that contact with mica has got to be the cause of many of them.
How many different crystals did you use for the pics above?
I have to add some pics of the one crystal from the same area I found recently
with very similar signs. I need to get better magnification before I can check for any monazite.
Here are different angles of the whole crystal.
DSCN1542.JPG
( 187 KB | 107 Downloads )
DSCN1549.JPG
( 169 KB | 119 Downloads )
DSCN1545.JPG
( 190 KB | 109 Downloads )
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Re: Unusual face
Reply #6 -
Jul 14
th
, 2014 at 10:53pm
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I have not seen any "textures" that compare "exactly" with
the first one you pictured, but some pretty crazy other stuff.
Here are a few close-ups.
DSCN1553.JPG
( 231 KB | 96 Downloads )
DSCN1552.JPG
( 104 KB | 131 Downloads )
DSCN1555.JPG
( 160 KB | 110 Downloads )
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Re: Unusual face
Reply #7 -
Jul 14
th
, 2014 at 10:57pm
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This is a recent surface find from that area with a nice patch
of the red rutile, another possible culprit for the unusual formations.
DSCN1459.JPG
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Scott LaBorde
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Re: Unusual face
Reply #8 -
Jul 15
th
, 2014 at 10:49pm
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@ Joe, I used 4 different crystal specimens for those photos.
Very unusual pattern indeed on the one you posted. It's like the triangles are lined up along parallels. Great pictures of it too. I know quartz can grow epitaxial to feldspar and create whats called graphic granite with similar patterns. It's possible that crystal was once juxtaposed or entirely encased in feldspar.
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Scott LaBorde
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Re: Unusual face
Reply #9 -
Jul 16
th
, 2014 at 11:40am
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JoeM wrote
on Jul 14
th
, 2014 at 10:43pm:
Of course it is very hard to claim the derivation for each and every one of these anomalous faces
but I think you will have to agree, having seen many in situ
growing amongst the mica, that contact with mica has got to be the cause of many of them.
A mica interaction would not be responsible for the beveled faces I photographed in this thread. I certainly understand your point and how it closely it might resemble the striations one sees with a mica contact. These particular faces are consistent in angle and position to assume "s" face expression. Also, most if not all the crystals that display these beveled edges do not occur on just one random edge, but multiple edges on the same crystal. This would imply something more than a random coincidental contact with mica.
I drew up a quick diagram below to show how the "s" faces specifically are involved and how they can be recognized in the photos. As you can see in the left image, the "s" face always occurs parallel or juxtaposed to the lower left or right of one of the rhombohedral or termination faces. In the right image I simply duplicated and carried this "s" face downward along the edge of the prism. You can see how the angle remains exactly the same as the original "s" face as it is repeated going down the prism. You can see this exact "s" face angle repeated in my specimen photographs.
Take a look again at images z39 -- z43 above as you will be able to identify the "s" face with its relationship to the rhombohedral or termination face. You can see the same angel is preserved as it travels down the prism.
«
Last Edit: Jul 16
th
, 2014 at 1:33pm by
Scott LaBorde
»
sface.jpg
( 87 KB | 115 Downloads )
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Re: Unusual face
Reply #10 -
Jul 17
th
, 2014 at 9:55am
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Excellent pictures of those faces Scott and Joe. I just tried for 30 minutes trying to zoom in like that on my camera but it's a lot harder than I thought it would be.
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