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Smectite Group : A0.3D2-3[T4O10]Z2·nH2O

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minID: GER-PC5

Smectite Group : A0.3D2-3[T4O10]Z2·nH2O

This image is copyrighted. Unauthorized reproduction prohibited.
Dimensions: 4.0 cm x 2.5 cm x 2.0 cm
Field of View: 12.0 mm

Filamentous bright yellow threads of smectite group clay in a basalt vesicle. This filamentous clay occurs often in the basalts of my area and comes in a variety of colors including white, yellow, orange, green, brown, blue, purple, and black. Yellow is by far the most common color. A good guess would be that this filamentous clay is either montmorillonite or saponite, but that would only be a best guess. ID to the Smectite Group is visual coupled with the aid of the following reference which notes that the Smectite Clay Group is the predominant clay within the Columbia Flood Basalts.
Summers, Karen V., 1976, Mineralogical Notes-The Clay component of the Columbia River palagonites, American Mineralogist, Volume 61, pages 492-494
Modified by CombineZP

Collected: 2016

This Photo was Mindat.org Photo of the Day - 7th Feb 2020

This photo has been shown 654 times
Photo added:18th Aug 2016
Dimensions:2421x1929px (4.67 megapixels)

Data Identifiers

Mindat Photo ID:765973 📋 (quote this with any query about this photo)
Long-form Identifier:mindat:1:4:765973:4 📋
GUID:2e7a67bd-9329-4171-b376-21577939e465 📋
Specimen MinIDGER-PC5 (note: this is not unique to this photo, it is unique to the specimen)

Discuss this Photo

Photossmectite POTD

7th Feb 2020 06:40 UTCAlfredo Petrov Manager

Congratulations, Doug!
Proof that even common clay minerals can be beautiful and "collectable" (well, to micromounters anyway).

7th Feb 2020 07:31 UTCKeith Compton 🌟 Manager

Alfredo
The specimen itself is 4cm so a little bigger than one of those "micromounts". Wouldn't fit on a cactus spine !

But I agree, it is nice to see an interesting "common" mineral.

Great "biologic" looking specimen.

Thanks Doug

7th Feb 2020 22:02 UTCRalph S Bottrill 🌟 Manager

Yes it’s intriguing how often a  phyllosilicate like smectite or illite with a strong layer structure will grow as fibres rather than plates. But clays are a big world of research on their own!

8th Feb 2020 02:14 UTCKevin Conroy Manager

As an aside, Jared Freiburg, Georg Grathoff and Zakaria Lasemi put together the "Field trip guide to kaolinite geodes in Hamilton, Illinois, USA, 55th Annual meeting of the Clay Minerals Society".   On page 25, figure 40 is a SEM photo of kaolinite that I think is really nice.   To see it click the application/pdf link under "Files" here:  https://www.ideals.illinois.edu/handle/2142/101835

8th Feb 2020 03:02 UTCPaul Brandes 🌟 Manager

Almost looks like a gob of neon seaweed.
Beautiful specimen!

8th Feb 2020 05:27 UTCJolyon Ralph Founder

ABOUT TIME!  Smectite has been neglected for far too long.

9th Feb 2020 05:42 UTCDoug Schonewald

Thanks to all for the comments. Since clays are one of he most common minerals in my immediate area I've collected quite a few of them. This one is pretty good sized but I've a few that would easily fit into a micro box.
 As you can imagine trimming such delicate assemblages is problematic, even if the specimen is quite small

9th Feb 2020 05:57 UTCKevin Conroy Manager

As Ralph said the study of clays is a specialty.  When viewed at the proper magnification they can be really remarkable.

9th Feb 2020 12:20 UTCHerwig Pelckmans

Doug,
Trimming a specimen so it would fit in a box is not always the best way to go.
Even for microminerals (please note I used the word microminerals and not micromounts) it is not a necessity to always put them in micromineral boxes.
In  general, if the specimen needs a larger box, then it is better practise to use that larger box. Trying to trim a specimen down to a preferred size might end up ruining the specimen.
Cheers, Herwig 

9th Feb 2020 14:04 UTCDoug Schonewald

That is true Herwig, but I do enjoy the actual process of mounting so I sometimes have a go at it. I am learning quickly what to try and what to leave alone.

9th Feb 2020 18:25 UTCHerwig Pelckmans

Great! Don't get me wrong, there is nothing wrong with micromounting, on the contrary! But since I prefer the "quick and dirty way", I don't mount mine, I just fix them in their boxes with putty (mineral tack).
BTW, nice photo on your home page, Doug! Great specimen!
Hope to make it to WA again one day.
Cheers, Herwig
(Belgium, Europe)
  

9th Feb 2020 19:26 UTCDoug Schonewald

Herwig,
If so please look me up. I would happy to spend a day collecting with you in Grant County or beyond. Walking is easy and specimens are plentiful

11th Feb 2020 04:26 UTCHerwig Pelckmans

OK, Doug, will let you know! Thanks for the offer!
Cheers, Herwig
 
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