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GeneralMica fom Gothenburg, Sweden

26th Jun 2016 15:30 UTCJoshua Chambers

Hi all

I have some lepidolite and muscovite fom Gothenburg, Sweden. Gothenburg isn't listed as a mineral locality here on Mindat, does anyone know of mica in Gothenbug? Or any sub-localities where they could have come from?

Also, I've seen that the name 'lepidolite' has been discredited by the IMA, does this mean I should still use the name? Or is it now called something else?

Lepidolite

Muscovite

Thanks

Josh

26th Jun 2016 16:24 UTCD. Peck

Josh, Lepidolite used to be the name given to lithium bearing mica. I assume the IMA considered it to be too broad so they "changed the rules" and made it the name of a continuous series with end members of Polylithionite and Trilithionite. Without an analysis, there is no way to know where in that series a lithium mica is located, so labeling your specimens Lepidolite is perfectly acceptable.

26th Jun 2016 19:07 UTCKnut Edvard Larsen 🌟 Manager

Gothenburg is an english name of the Swedish town of Göteborg: http://www.mindat.org/loc-221073.html.

It is not possible to pinpoint a locality for your sample.

this is what I know:

There is a mica-bearing pegmatite in the Göteborg municipality registered in Mindat, named Högsbo http://www.mindat.org/loc-10007.html. Muscovite is known from this locality, but I have found none reference to lepidolite from this locality.

I have not visited the locality myself I cannot give a personal knowledge

There is a regular yearly mineral fair in Göteborg and the sample may have perhaps been obtained there and labelled as coming from Gothenburg but it provenance may be another locality in Sweden. ??? hard toknow. Where did you get it ?

26th Jun 2016 19:37 UTCJoshua Chambers

Don, thanks for the reply. That's clarified everything for me. :-)

Knut, thank you for the information, I obtained both specimens from a mineral fair in England. I suppose it is possible that these were bought at Gothenburg, and then labeled as coming from there; we will never know.

Thanks

Josh

26th Jun 2016 20:41 UTCJohan Kjellman Expert

Högsbo doesn't have any lepidolite. Could it be fluorite films giving it a lilac colour? Then Högsbo could be a candidate, even though it doesn't feel 100%.

Otherwise, altough it is hard to say from the images if this mica is really "lepidolitic" (lilac colored). but provided it really is, the appearance of the mica and matrix strongly reminds me of http://www.mindat.org/loc-29699.html which is an hours drive away from Göteborg.

cheers

26th Jun 2016 21:31 UTCJoshua Chambers

Hi Johan, I could check for fluorite films tomorrow. You may be right about the locality. I will do some more research and thank you for the information.

Thanks

Josh

26th Jun 2016 22:43 UTCJohan Kjellman Expert

I dare saying if I had it in my hand I would tell you right away. These pegmatites is were I started my some 40 years ago.

cheers

27th Jun 2016 04:25 UTCWayne Corwin

Josh

I only see purple lepidolite looking mica, on the right side, in your second photo,,,,, but you have it labled "Muscovite"

27th Jun 2016 08:46 UTCJoshua Chambers

Johan, if only I could give it to you to identify :-D

Wayne, just checked and you are absolutely right. The second photo is of the back of the lepidolite, not the muscovite. I made a mistake when uploading, I'll change it now

Thanks

Josh

27th Jun 2016 11:10 UTCJohan Kjellman Expert

so, it is actually two pieces?

one lep and one musc?

27th Jun 2016 12:20 UTCJoshua Chambers

Yep

27th Jun 2016 13:59 UTCAndré Heyninck

In the book"Minerals from Sweden " by Wilke the talk about two pematites at Högsbo.Högsbo north and south.

There where many minerals like beryl, amazonite, garnet, fluorite, monazite and others.Also there was muskovite, biotite but lepidolite that is out of the question.

Now there is no acces to that place.

Best regards.

André.

27th Jun 2016 16:48 UTCKnut Edvard Larsen 🌟 Manager

A simple, easy- to-do but an effectively test to see if you have lepidolite (a lithium mica) is described in this tread: http://www.mindat.org/forum.php?read,6,56294,57407#msg-57407 ( see Peter Andresens post)

4th Oct 2016 11:18 UTCJoshua Chambers

I have only just got round to testing the 'lepidolite'.After testing 5 times, I found it to not melt, so is lithium Muscovite? I've also seen that muscovite can be pink due to "dominance of Mn3+ on Fe2+ in the absence of Fe3+". It's probably safe to just call it muscovite (no variety). Is it still possible it is from Gothenburg?

Any help is appreciated

Thanks

Josh

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