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Identity HelpKola Minerals - New Questions

24th Jan 2016 12:07 UTCUwe Ludwig

Hallo friends,

I received some new material of the Kola. Among them was a specimen of Khibiny/Eveslogtchorr, labelled as yellow amorphous aggregates of Ancylite together with Natrolithe and Eudialyte. Besides these minerals I found Aegirin needles as well as some other minerals on the specimen.

Therefore, I ask whether anybody knows this location and the minerals there. I want to know the following:

Are the yellow aggregates really the Ancylite?

Are the silky white aggregates on pict.Eveslogtchorr 3 the Natrolithe?

What may be the white crystalls on pict.Eveslogtchorr 2?

What may be the brown aggregates on pict. Eveslogtchorr 1? And

What may be the brown linear crystalls on Eveslogtchor 4?

Any answer would be highly appreciated.

Best Regards

Uwe Ludwig

24th Jan 2016 12:09 UTCUwe Ludwig

Now the remaining two pictures:

and the complete specimen:

Best Rgerads

Uwe Ludwig

24th Jan 2016 13:52 UTCReiner Mielke Expert

"amorphous aggregates of Ancylite" If it is amorphous then it can not be ancylite. Photo 3 and 4 appear to be some sort of alteration mineral. The mineral in Photo 2 appears to have a cleavage so it cannot be ancylite, maybe feldspar. What is the hardness? Ancylite shows very strong spectral adsorption lines so test it with a spectroscope.

25th Jan 2016 04:35 UTCWayne Corwin

Uwe

How soft is the pink stuff?

It looks like montmorillonite thats altering from the white feldspar (albite?)

26th Jan 2016 21:38 UTCPavel Kartashov Manager

Are the yellow aggregates really the Ancylite? No, I don't see it here at all.

Are the silky white aggregates on pict.Eveslogtchorr 3 the Natrolithe? No, this is mineral of gotzenite-rinkite family. Probably with asdmixture of some titanite fibres. Apparently the mineral is low-REE - it is crystalline, not metamictized.

What may be the white crystalls on pict.Eveslogtchorr 2? Microkline.

What may be the brown aggregates on pict. Eveslogtchorr 1? Apparently this is simply mud, probably with organic content.

What may be the brown linear crystalls on Eveslogtchor 4? Usual aegirine.

27th Jan 2016 07:41 UTCUwe Ludwig

Thank you Pavel,

your answer makes me not so happy but it helps me to correct my labels.

Best Regards

Uwe Ludwig

29th Jan 2016 14:41 UTCUwe Ludwig

I have the specimen still on my table. Pavel Kartashov was absolutely right - the brown aggregate was mud probably with iron content. I removed it with water and cleaning agent and found below this little crystalls. I guess it is a zeolithe - may be chabasite. Can anybody confirm that?

Best Regards

Uwe Ludwig

29th Jan 2016 16:15 UTCD. Peck

Uwe, some of the xls at the bottom of the photo appear to be pseudocubic, consistent with chabazite. If you can sacrifice one, check hardness, and try heating it on charcoal or plaster. It should intumesce but still somewhat retain the same shape.

29th Jan 2016 20:57 UTCUwe Ludwig

Hello Don,

yes, good proposals but hard to realize because the the crystalls are very small. The magnification on the picture is abt. 20-fold.

Rgds.

Uwe Ludwig

30th Jan 2016 01:21 UTCPavel Kartashov Manager

It seems to me, that in this cavity some of hexagonal crystals of wadeite presents (the best one is some right from fibre). More larger xls of wadeite from this pegmatite has obvious lilac color, but smaller xls are colourless or greyish. Other "cubic" xls able to be microcline of later generation.

30th Jan 2016 09:10 UTCUwe Ludwig

Wadeite would be great. But I'm not sure. The small crystalls show no fluoreszence (SW and LW). I made a sketch of two typical crystalls. I enclose a pict. According to the Wadeite-gallery it could be Wadeite.

Pavel, can you agree?

Rgds.

Uwe Ludwig

30th Jan 2016 21:58 UTCPavel Kartashov Manager

This sample originate from some smaller satelite of large pegmatite of "Wadeite point". Usually they are found on the western slope of Astrophyllite spur of Eveslogchorr Mt (in other words on the left slope of Astrophyllite stream walley).

Wadeite is quite abundant here. Your drawings demonstrate typical shape of wadeite crystals (the upper more abundant, the lower - more rare habitus).

31st Jan 2016 21:36 UTCUwe Ludwig

Thank you Pavel,

the Kola-pagmatites are always an adventure when checking by stereomicro:-)

Regards

Uwe

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