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tommytowne
Joined: 01 May 2012
Posts: 13
Location: California
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 Posted: May 06, 2012 00:06 Post subject: Here's another |
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Sure is pretty
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| a member gave this to me at my gem and minerals club |
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nurbo
Joined: 23 Sep 2008
Posts: 457
Location: Lancashire
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| Posted: May 06, 2012 00:55 Post subject: Re: here's another |
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| Do you have any more details about this? where its from etc etc? The more information you give us the more likely you are to get a firm ID, on the basis of the picture it looks a bit like Crinoids in mudstone
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tommytowne
Joined: 01 May 2012
Posts: 13
Location: California
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| Posted: May 06, 2012 04:31 Post subject: Re: here's another |
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| sorry the guy who gave it to me had no idea what it was. It's hard stuff like a jasper in hardness I guess. I am new here and will learn how to post better in the future with better details.
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Jordi Fabre
Overall coordinator of the Forum
Joined: 07 Aug 2006
Posts: 4899
Location: Barcelona
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| Posted: May 06, 2012 04:49 Post subject: Re: here's another |
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| tommytowne wrote: | | ...I am new here and will learn how to post better in the future with better details. |
Welcome to FMF Tommy.
Please read: A general guide for using the Forum with some rules and tips specially the point 7:
7.-) If you need help in identifying a mineral then please follow the recommendations given in the ‘Style Guide’ of the section ‘What is this?’ that you can read by following this link
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tommytowne
Joined: 01 May 2012
Posts: 13
Location: California
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| Posted: May 06, 2012 04:59 Post subject: Re: Here's another |
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I will try to add such details from the link you posted in the future. Thank you.
2 - LOCALITY,?
3 - MATRIX, I would compare it to a jasper from the way it cut.
4 – COLOR, completely opaque no crystals or agate. colors are from a green/black to a pea green to an od green and a yellow green.
5 - LUSTER non metalic
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GneissWare
Joined: 07 Mar 2008
Posts: 1287
Location: California
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| Posted: May 06, 2012 09:27 Post subject: Re: Here's another |
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| tommytowne wrote: | | ...Sure is pretty |
Its an "agate" of some sort. Other than that determination, the lapidary people have all kinds of names for them based on how they look which has nothing to do with chemistry. They are typically cryptocrystalline quartz with various impurities. There are several good books on agates on the market.
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tommytowne
Joined: 01 May 2012
Posts: 13
Location: California
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| Posted: May 06, 2012 13:39 Post subject: Re: Here's another |
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| No it is not hard enough to be agate. Perhaps this is the wrong forum for my rocks. Does anyone know of a rock id forum that is for rockhounds and lapidary types?
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Vinoterapia
Joined: 03 Feb 2009
Posts: 179
Location: Houston, Tx
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| Posted: May 07, 2012 04:25 Post subject: Re: Here's another |
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| To me your rock looks like a rhyolitic lava. But you have to understand that by just looking at a picture this is a guess.
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tommytowne
Joined: 01 May 2012
Posts: 13
Location: California
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| Posted: May 07, 2012 05:00 Post subject: Re: Here's another |
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I really don't think this forum is for rock identification. I posted these pictures in a yahoo rockhounding group yesterday and got them all named by 4 different members.
This is Kambaba Jasper
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Joaquin Montoro
Joined: 25 Nov 2010
Posts: 225
Location: Murcia (Spain)
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| Posted: May 07, 2012 05:08 Post subject: Re: Here's another |
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I don't understand...you say it cannot be agate, but jasper. As long as I know both have the same hardness, so where is the problem?
_________________
Damnati ad Metalla |
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tommytowne
Joined: 01 May 2012
Posts: 13
Location: California
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| Posted: May 07, 2012 05:21 Post subject: Re: Here's another |
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| agate is harder than jasper.
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Jordi Fabre
Overall coordinator of the Forum
Joined: 07 Aug 2006
Posts: 4899
Location: Barcelona
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| Posted: May 07, 2012 05:56 Post subject: Re: Here's another |
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| tommytowne wrote: | | agate is harder than jasper. |
I'm afraid you are confused. Agate and Jasper both are varieties of Chalcedony ( https://www.mindat.org/search.php?name=agate and https://www.mindat.org/search.php?name=jasper ), so both should have the same hardness: 6½ - 7.
I believe that the problem is that you are looking for commercial names and here we use the real name of the minerals, which is, in my opinion, much better and safer.
Here you have the official list of the real names of the different mineral species -> https://rruff.info/ima/
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tommytowne
Joined: 01 May 2012
Posts: 13
Location: California
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| Posted: May 07, 2012 14:51 Post subject: Re: Here's another |
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| My diamond wheels would disagree with you but thanks for the links. I do appreciate them.
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