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Identity HelpPlease ID - Blue Quartz or Blue Chalcedony???
22nd Apr 2012 18:55 UTCClaire Brimson
I found this again in the Oulujoki river bed, Oulu, Finland. The river is frozen and it was just underneath the ice. The pictures do not do it justice as it is blue! It also has different coloured light coming through - refraction????? I guess a bit like opal type colour and lightings. It is hard, cannot be scratched with my pen knife but a pegmatite leaves a very slight mark on it. Streak is white.
I checked the blue Quartz page and it is a similar colouring to photo number 69601 if that helps. The lighting colours are pinks purples reddy orangey and yellowy.
Any ideas???????
many thanks.
Claire
23rd Apr 2012 11:20 UTCRock Currier Expert
23rd Apr 2012 11:49 UTCAmir C. Akhavan Expert
If these are fresh fractures, the luster is a bit too high for chalcedony.
The blue probably comes from light scattered at inclusions.
23rd Apr 2012 18:10 UTCKelly Colberg
13th May 2012 19:04 UTCClaire Brimson
Today I went ot Oulu Geological Museum and found the exact same mineral in the photos. It is apparently called Sinikvartsi (in Finnish) and the colouration is due to Crocidolite. Also apparently Sinikvartsi is a popular gem stone. Has anyone heard of it?? or know anymore about it?? I can not find it on here.
Many thanks
Claire
13th May 2012 20:37 UTCSteven Kuitems Expert
Steve.
13th May 2012 21:48 UTCAnonymous User
13th May 2012 22:04 UTCEmil Box
sininen=blue
So it is blue quartz.
Milo
14th May 2012 00:52 UTCPaul Brandes 🌟 Manager
14th May 2012 02:00 UTCFrank Keefer
14th May 2012 02:03 UTCFrank Keefer
14th May 2012 02:07 UTCHenry Barwood
Many years ago (40?), I bought some quartz from Finland that was identical to your specimen. It produced stars when cut in a cabochon. Until now , I've never seen another piece. Blue tinged quartz that is asteriated is common in the US from Virginia to Alabama in inner Piedmont rocks. Color is likely from either amphiboles, tourmaline or dumortierite. The color is both from the inclusions and light scattered from the inclusions. Some quartz with very tiny, non-oriented inclusions also has a blue color from light scattering (same as the sky).
18th May 2012 18:18 UTCPekka Ruoho
in previous discussion it was called "blue rocks". Here in Lapua, Finland there are lots of them.
see:blue rocks.
regards PekkaR
If somebody interested to get some, pls send pm
18th May 2012 19:29 UTCClaire Brimson
Thanks for your info and great to have someone near by Oulu...
Do you know the quarry where they all come from? I find mine on either the Oulu railroad (not reckomended!) or near to the Nallikari, sometimes on the Oulujoki as well. There is a peice in the Oulu Geological Museum and is called Sinikvartsi - blue quartz. I had mine bits I have checked by them and yup it is blue quartz!
I have pm'd you....
Kittoksia paljon
Claire
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