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DJandLIMON111
Joined: 14 Mar 2015
Posts: 43
Location: Montrose, Co
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 Posted: Mar 18, 2015 15:45 Post subject: What would cause the shape of this cavity? |
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Not really sure what type of rock it is that this is on. I broke a piece off and the specific gravity I got was 2.5. Maybe a form of quartz? But my question is, what would make the cavity form in the shape of a star like that?
| Locality: | | Montrose County, Colorado, USA |  |
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| Dimensions: | 12 x 10 mm |
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| Locality: | | Montrose County, Colorado, USA | |
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| Dimensions: | 4 x 5 inch |
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| Locality: | | Montrose County, Colorado, USA | |
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Pete Richards
Site Admin
Joined: 29 Dec 2008
Posts: 845
Location: Northeast Ohio
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| Posted: Mar 18, 2015 16:04 Post subject: Re: What would cause the shape of this cavity? |
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Yes, I think it is normal quartz in crystals that are grown around agate-like centers (translucent white) with crystals too small to see more than as sparkles. Good that you did the specific gravity test!
You obviously have some experience with image manipulation. It would help if you would explain the relationship between the three images, and in particular if (as I suspect) the third image has the star from the first image superimposed on it.
It would also help to know if the hole widens as it goes down. I.e. is the star shape maintained to the bottom of the hole, or is it just a feature of the upper surface?
I suspect that you have a beautiful coincidence on your hands, but others may have other ideas.
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Collecting and studying crystals with interesting habits, twinning, and epitaxy |
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DJandLIMON111
Joined: 14 Mar 2015
Posts: 43
Location: Montrose, Co
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| Posted: Mar 18, 2015 16:23 Post subject: Re: What would cause the shape of this cavity? |
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I'm not able to edit my post not sure why. The 2nd image "Wierdrock1` (1).jpg" is the other side of the rock - the way it was when I found it. And yes, the 1st image is a close up of the 3rd image. It does widen as it goes down. Some of the other cavities have a similar shape just not as distinct as the one I took pictures of.
| Mineral: | Quartz |
| Locality: | | Montrose County, Colorado, USA | |
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| Description: |
| Untouched rock side the way it was when i found it. |
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16847 Time(s) |
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| Mineral: | ??? |
| Locality: | | Montrose County, Colorado, USA | |
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| This is in some of the cavities it was in the star formation but i got it out with muratic acid. Any ideas what this is or could this have anything to do with the star shape? |
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| Mineral: | Quartz |
| Locality: | | Montrose County, Colorado, USA | |
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| Description: |
| This is just right next to the cavity its magnified about 60x maybe a little less |
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Jordi Fabre
Overall coordinator of the Forum
Joined: 07 Aug 2006
Posts: 5048
Location: Barcelona
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| Posted: Mar 19, 2015 04:39 Post subject: Re: What would cause the shape of this cavity? |
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| DJandLIMON111 wrote: | | I'm not able to edit my post not sure why... |
Please read: A general guide for using the Forum with some rules and tips point 11:
11.-) It is possible for people to edit their own messages. But there is on important limit on this capability - you can only edit them before some one else replies to them. See this page for more information.
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DJandLIMON111
Joined: 14 Mar 2015
Posts: 43
Location: Montrose, Co
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| Posted: Mar 20, 2015 17:22 Post subject: Re: What would cause the shape of this cavity? |
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| Any more thoughts anyone?
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marco campos-venuti
Joined: 09 Apr 2014
Posts: 227
Location: Sevilla
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| Posted: Mar 21, 2015 08:18 Post subject: Re: What would cause the shape of this cavity? |
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Just an idea: twinned muscovite.
I add a picture of Muscovite twinned crystals from Linopolis, Divino das Laranjeiras, Brazil.
| Mineral: | Muscovite twinned crystal |
| Locality: | | Linópolis, Divino das Laranjeiras, Vale do Rio Doce, Minas Gerais, Brazil | |
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16527 Time(s) |
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DJandLIMON111
Joined: 14 Mar 2015
Posts: 43
Location: Montrose, Co
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| Posted: Mar 21, 2015 13:29 Post subject: Re: What would cause the shape of this cavity? |
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| awesome has a very similar shape thanks for the input what would have corroded it away?
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Josele
Joined: 10 Apr 2012
Posts: 410
Location: Tarifa, Spain
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| Posted: Mar 21, 2015 16:23 Post subject: Re: What would cause the shape of this cavity? |
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Sorry I have no idea of what could have made this weird hole, but to me this type of quartz seems sedimentary, formed at low temperature. Although shape matches I would say that muscovite is a unlikely inclusion for this quartz.
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Josele |
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DJandLIMON111
Joined: 14 Mar 2015
Posts: 43
Location: Montrose, Co
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| Posted: Mar 23, 2015 10:36 Post subject: Re: What would cause the shape of this cavity? |
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| Well guys thanks for all the help and info!! Still not sure what it is so im just gonna go with what pete said a beautiful coincidence!! maybe one day ill figure it out haha :) thanks again guys!!!
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