Sciencemadness Discussion Board

Unknown mineral

Liamatpm - 19-12-2016 at 05:44

I have found a rock a unknown mineral. I can not identify it. It was from this quarry in Maine: http://www.mindat.org/loc-6648.html. I will post more pictures.

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Another picture

Liamatpm - 19-12-2016 at 05:45

Another picture

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Last picture

Liamatpm - 19-12-2016 at 05:47

Last picture

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Chlorine - 19-12-2016 at 06:17

I'm not entirely sure but It looks like red tourmaline.

Morgan - 19-12-2016 at 06:20

Looks kind of like this.

Afghanistan
https://commons.wikimedia.org/wiki/File:Garnet-Group-Quartz-...

Maine
http://www.imgrum.net/media/1266818789329529537_2293719537
http://scontent.cdninstagram.com/t51.2885-15/s480x480/e35/13...
http://www.imgrum.net/media/1266820108538800873_2293719537

garnet = a group of minerals; see almandine, andradite, grossular, spessartine, uvarovite
http://www.maine.gov/dacf/mgs/explore/minerals/guide/chapter...

"For gem identification purposes, a pick-up response to a strong neodymium magnet separates garnet from all other natural transparent gemstones commonly used in the jewelry trade."
https://en.wikipedia.org/wiki/Garnet

[Edited on 19-12-2016 by Morgan]

crystal grower - 19-12-2016 at 07:49

I agree with Morgan, it's most likely a garnet (pyrop or almandine I think..).

Liamatpm - 19-12-2016 at 08:09

I thought it was almandine, but I didn't know if it could be as light as my rock, thanks for the help everyone!

-Liam

Morgan - 19-12-2016 at 09:06

Tidbits
https://www.youtube.com/watch?v=U2RZ1NLwcOQ#t=57
https://www.youtube.com/watch?v=3Ncjq0Wb2ZU

diddi - 19-12-2016 at 13:28

It does have the right structure for garnet and is probably almandine rather than pyrope (which tends to have a more claret colour red) the reason your rock is not as heavy as you expect for garnet is that it is actually granitic material with little garnets that hardly contribute to the density of the whole specimen.

[Edited on 19-12-2016 by diddi]