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Lehmannite : Na18Cu12TiO8(AsO4)8FCl5, Tenorite : CuO, Sylvite : KCl

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Copyright © excaliburmineral.com
 
 
 
 
minID: HUT-4PC

Lehmannite : Na18Cu12TiO8(AsO4)8FCl5, Tenorite : CuO, Sylvite : KCl

Copyright © excaliburmineral.com  - This image is copyrighted. Unauthorized reproduction prohibited.
Field of View: 1 mm

Dark green tiny crystals and aggregates of lehmannite perched on the edges of black tabular tenorite crystals on scoria matrix. The light blue mineral is an alluaudite-group arsenate, possibly johillerite. The colourless matrix is sylvite.
Lehmannnite is an extremely rare sodium copper titanium chloroarsenate at this prolific Kamchatka volcano. Named for German mineralogist Johann Gottlob Lehmann (1719-1767), discovered of crocoite, the first new mineral species described from Russia. In 1852, lehmannite was a proposed name for crocoite, but the name was never in wide use. Author's studied material, Excalibur Mineral Corp. specimen, image by Robert Fung.

For discussion see https://www.mindat.org/mesg-497689.html

This photo has been shown 316 times
Photo added:17th Jan 2019
Dimensions:1645x1733px (2.85 megapixels)
Camera:NIKON Df

Data Identifiers

Mindat Photo ID:932631 📋 (quote this with any query about this photo)
Long-form Identifier:mindat:1:4:932631:3 📋
GUID:16c037a9-f09b-4cb9-8479-4babca1e3b10 📋
Specimen MinIDHUT-4PC (note: this is not unique to this photo, it is unique to the specimen)

Discuss this Photo

PhotosNo lehmannite.

25th Nov 2019 18:26 UTCCarsten Slotta 🌟 Expert

This is tenorite, not lehmannite. Lehmannite is of dirty green color.


26th Nov 2019 14:14 UTCUwe Kolitsch Manager

Message sent.

26th Nov 2019 15:48 UTCUwe Kolitsch Manager

Tony Nikischer, who uploaded the photo, disagrees:

The specimen came directly from the author, Igor Pekov. Although my photo is not particularly good, you can see the dark green color on the thin edges of the sample, but the platy aggregates appear nearly black. The tenorite from Tolbachik is typically thin, wispy and elongated rather than the thicker, somewhat platy lehmannite specimens I have handled.

I am confident that Igor identified his own mineral properly.



26th Nov 2019 18:21 UTCCarsten Slotta 🌟 Expert

I don't doubt that Igor Pekov identified his own mineral properly, but since lehmannite is usually associated with tenorite and johillerite I strongly believe that the mineral in question was just mixed up by the photographer.
Please compare the photos both of tenorite and lehmannite from Tolbachik on mindat and also the closely related arsmirandite which has very similar color as lehmannite.

26th Nov 2019 18:30 UTCUwe Kolitsch Manager

I pointed Igor to this thread.

27th Nov 2019 08:20 UTCUwe Kolitsch Manager

Igor kindly replied:


I see the following minerals in this photo:
- tenorite: cluster of big black flattened crystals;
- alluaudite-group arsenate: light blue mineral (I cannot identify it exactly because colour of these arsenates strongly depends on type of lightening and varies under different lights from violet to light blue; I think that this mineral is johillerite);
- sylvite: colourless matrix;
- lehmannite: tiny green aggregates on edges of some tenorite crystals.
Unfortunately, this photograph is not a good image for lehmannite: its aggregates are not in focus (e.g., see vague green "band" in left part of the tenorite cluster).


27th Nov 2019 08:55 UTCFrank K. Mazdab 🌟 Manager

the composition (of the photo) looks interesting, and as such it might benefit from stacked focus photography to better bring out the different species.

28th Nov 2019 09:01 UTCUwe Kolitsch Manager

Tenorite and sylvite added to photo, caption edited.
 
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