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Identity HelpFerrimolybdite?

9th Aug 2010 17:22 UTCWillie Klaja

Hardness is less then 2½ (Finger nail)

Colour is also yellow

It looks kind of earthy

Streak is light yellow

Locality is: Sunnerskog

Anybody care to confirm my theories..or??

Best Regards,

Willie

9th Aug 2010 19:09 UTCDomenico Preite Expert

is possible koechlinite..

ciao, Domenico Preite

9th Aug 2010 22:02 UTCRock Currier Expert

A pseudomorph?

10th Aug 2010 01:07 UTCReiner Mielke Expert

limonite pseudo siderite? Put a piece in strong ammonia solution. If it slowly decomposes it is likely ferrimolybdite, if not then probably limonite.

10th Aug 2010 11:40 UTCDomenico Preite Expert

In this time (two year) I check a site where are a lot molybdenite samples and other specimens associated,

for me koechlinite is a strong possibility ....sure not ferrimolybdite, ciao

10th Aug 2010 12:56 UTCWillie Klaja

Rock Currier,

It would be plausible.

Way to soft for Limonite.. At under 2 ½.

Not the typical brownish streak that Limonite has, either.

Will have to check for Ammonia, if I have it here.

koechlinite has the same hardness as Russelite, I suppose?

Russelite seems more fitting, colour wise. Still to hard though.

10th Aug 2010 15:30 UTCUwe Kolitsch Manager

Chemical and/or X-ray diffraction analysis will be necessary.

10th Aug 2010 15:33 UTCDonald Vaughn

talc pseudomorph

10th Aug 2010 19:17 UTCReiner Mielke Expert

Limonite is a mixture and if it is Jarosite dominant the streak will be yellow. Also limonite can be softer than 2, depends on how crystalline it is.

10th Aug 2010 19:46 UTCWillie Klaja

Reiner,

How strong of a solution of Ammonia would suffice?

Uwe,

I might have to consider that possibility.

Donald,

That could be.

10th Aug 2010 21:50 UTCReiner Mielke Expert

I got that info out of Sinkankas Data book. Doesn't say how strong but I am sure stronger than household ammonia. The stuff they use to develop blueprints should be strong enough.

10th Aug 2010 22:58 UTCStuart Mills Manager

There is no way it is limonite. koechlinite/bismutite/russellite are more likely. It could also be clay like kaolinite. You might want to check UV.

11th Aug 2010 12:26 UTCWillie Klaja

There is no reaction to UV. (Neither LW nor SW)

19th Aug 2010 11:46 UTCWillie Klaja

Up-date:

It is now in Ammonia, at 24.5% (36% seems to be max)

I'll check later to see how it goes.

20th Aug 2010 16:40 UTCWillie Klaja

And another update, it is slowly absorbed by Ammonia.

Case closed?

Thanks,

Willie

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