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Scott LaBorde
Joined: 14 Dec 2009
Posts: 104
Location: North Carolina
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 Posted: Nov 09, 2010 09:46 Post subject: Quartz twinning -- brazil law, or contact area fluke |
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I recently found this quartz crystal in the dump piles of old quartz mine in NC. There is an unusual area on the crystal that seems to signify x or s faces oriented in such a way as to represent a brazil law. However, the faces are atypical of a textbook morphological brazil law twin. It was suggested this may be a contact area between this crystal and another and the striations are simply the by-product so to speak. I have seen this "stair step pattern" myself as a result of a juxtaposed crystals so it does seem plausible. Any thoughts or suggestions?
| Description: |
| Notice the s and x face visible on the left indicating a left handed crystal. The striations on the right side have me baffled. If they were s faces with the striations it would seem to suggest it's both left and right, but then what face is in the middle? |
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7196 Time(s) |
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| Description: |
| The crystal. Not entirely in focus because I just wanted to show the faces in question. |
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7216 Time(s) |
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Scott LaBorde |
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Pete Richards
Site Admin
Joined: 29 Dec 2008
Posts: 828
Location: Northeast Ohio
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| Posted: Nov 19, 2010 13:11 Post subject: Re: Quartz twinning -- brazil law, or contact area fluke |
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I think it's a scar from contact with another crystal. Sorry, Scott.
Pete Richards
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Collecting and studying crystals with interesting habits, twinning, and epitaxy |
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Scott LaBorde
Joined: 14 Dec 2009
Posts: 104
Location: North Carolina
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| Posted: Nov 19, 2010 16:24 Post subject: Re: Quartz twinning -- brazil law, or contact area fluke |
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Yes, I have capitulated to a contact feature origination. It's the only thing that would explain it. Thanks for looking :).
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Scott LaBorde |
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