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Identity HelpGarnet from Hamarøy

28th Nov 2009 08:11 UTCGuillaume BONNET

Hi. I just bought a mineral,with an association of garnet and biotite. Someone told me that it looked like something which could come from Norway, from the Hamarøy quarry. There's a bright blue cristal on it. Do you think cordierite could fit to the site ? (Please excuse my english which is not so good ...).

Here's the blue cristal, shown by an arrow.

28th Nov 2009 08:30 UTCAlessio Piccioni

Maybe also quartz, or kyanite, or beryl.

28th Nov 2009 11:12 UTCKarsten Eig

The blue stuff may just be blueish quartz...? It does not have the fibrous appearance of kyanite.

Is the specimen from the pegmatite quarries, or from the Caledonian thrust nappes? That could be relevant to the expected associated minerals.

28th Nov 2009 12:47 UTCGuillaume BONNET

I don't think it is kyanite, it does not look like some. I don't know where this specimen come from. I just bought it, and someone tolod me it could look like garnets from Hamarøy, Norway. I cannot tell you more about it. If you don't know what the blue stuff could be, would you, even if I didn't have given the place i think it come from, would you have told me it could come from Hamarøy ?

Thank you for help.

Guillaume

28th Nov 2009 13:18 UTCerik vercammen

I've seen a lot of pieces like this in a shop. They came from Brazil, and the contain blue kyanite.

28th Nov 2009 15:31 UTCGuillaume BONNET

Well thank you (I would have prefer this specimen to be european, because I try to have ony european and french specimens, but if you tell me it is brasilian, I may believe you, I don't know mch about it ...

If someone would like to add something, then do not hesitate.

GB

28th Nov 2009 16:10 UTCJames Christopher

Looking at the full sized photo, it doesn't look one bit like kyanite to me.

28th Nov 2009 16:36 UTCPavel Kartashov Manager

May be it is blue corundum? Which is hardness of the mineral?

28th Nov 2009 17:24 UTCMister Crystalman

Many Colorado Pegmatites are filled with very similar associated minerals.......In the case of about 40 pegmatites in northern colorado i have excavated. ...Biotite/Muscovite,Garnet,Quartz, Feldspar and Beryl..almost indentical to your image...........almost 100% positive your blue in question is Beryl or Beryllium included Quartz........corundum in an association like this is something i have yet to see......

My vote.....Beryl.............if it is quartz than its Berylliuum included making your "blue" coloration.........as to locality.....not a clue.

28th Nov 2009 17:47 UTCWilfried Steffens

Hi Guillaume,

there may be specimens like that from Brazil, but clearly there are such from Hamarøy (i have one myself). I can see no reason to doubt the locality given to you - just take a look at the Hamarøy mineral pictures her on mindat.

However, I am not sure about the exact locality - there are several quarries in the area, maybe it's Haakonhals.

And regarding the blue mineral I have no clear suggestion either. Cordierite is the least likely, beryl or apatite might be options. Too small to check the hardness I suppose...

But I am sure our Norwegian friends will be able to say something more.

Best regards

Wilfried Steffens

28th Nov 2009 18:37 UTCGuillaume BONNET

I tried to check the hardness, but you are right Wilfried, it is to small to do anything.

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