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Arsenoclasite : Mn2+5(AsO4)2(OH)4

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Copyright © 2023 Jason B. Smith
 
 
 
 
minID: 065-LCK

Arsenoclasite : Mn2+5(AsO4)2(OH)4

Copyright © 2023 Jason B. Smith  - This image is copyrighted. Unauthorized reproduction prohibited.
Field of View: .97 mm

Cluster of arsenoclasite xls on rhodochrosite. Originally sold as gatehouseite but EDS revealed dominant AsO4. JBS specimen and photo.

This photo has been shown 540 times
Photo added:14th Apr 2009
Dimensions:7862x5240px (41.20 megapixels)

Data Identifiers

Mindat Photo ID:225111 📋 (quote this with any query about this photo)
Long-form Identifier:mindat:1:4:225111:7 📋
GUID:29d8b056-a3e1-4e1c-a007-f14545cad938 📋
Specimen MinID065-LCK (note: this is not unique to this photo, it is unique to the specimen)

Discuss this Photo

Photosarsenoclasite vs. gatehousite

7th Dec 2023 02:29 UTCJason B. Smith Expert

Was sent an email about this old photo of mine because I forgot to change the description after I had it analyzed and was shown to be arsenoclasite rather than the gatehouseite it was purchased as. Fixed that omission. 

It reminded me however that I meant to start a thread about this topic. There are still quite a few photos of these tabular, red crystals originally sold as gatehouseite by many dealers years ago under the gatehouseite photos, and I believe that may be in error if my analysis is typical of the results. Arsenic was quite dominant in my sample. 

7th Dec 2023 02:32 UTCJason B. Smith Expert

https://www.mindat.org/photo-894280.html

This photo even shows the acicular, straw yellow gatehouseite crystals in association with the tabular, brownish red arsenoclasite crystals. Seems there has been some confusion about this find..... Has any work been done on it? 

7th Dec 2023 02:39 UTCJason B. Smith Expert

I didn't even realize this was on the page notes for gatehouseite:

"Often in rounded crystal aggregates or in divergent crystal clusters. Isostructural with its arsenate analogue arsenoclasite and aggregates to 5 mm may be overgrown on arsenoclasite. Although gatehouseite is the phosphorus analog of arsenoclasite and occurs together or in close association with it, arsenoclasite is usually the more conspicuous mineral. Gatehouseite frequently occurs as pale-yellow gemmy rod-like crystals that are usually smaller than the red to red-brown arsenoclasite. The arsenoclasite is frequently somewhat blocky to wedge-shaped and is often ten or more times larger than gatehouseite, suggesting a different phase of growth. Caution is advised in sight identifying gatehouseite as gatehouseite occurs as somewhat bladed crystals. Arsenoclasite without gatehouseite present has been distributed as only gatehouseite."

Seems all the above photos need to be corrected.  

7th Dec 2023 03:47 UTCHerwig Pelckmans

Jason B. Smith Expert  ✉️


All these photos appear to show arsenoclasite when compared to other, analyzed samples. 
 The photo in question states the specimen was fully analysed as well.
Contrary to the other photos, this specimen does not show the red-brown color of arsenoclasite.
It also looks like it has a radiating structure. So IMHO this photo most likely does show gatehouseite.

8th Dec 2023 23:51 UTCJason B. Smith Expert

These crystals do look different from the reddish-brown crystals originally sold as gatehouseite. I still think the others should be corrected as to not cause continued confusion. 

9th Dec 2023 01:12 UTCRalph S Bottrill 🌟 Manager

I sent a question on one photo that looked clearly like arsenoclasite, but I am unsure on many of these. The original description states that the arsenoclasite here was dark orange-brown prisms with overgrowths or rims of the gatehouseite in pale yellow to brownish orange bladed crystals, with limited solid solution. I don’t like naming minerals just on colour, but suspect most of the above photos may be correctly named, or maybe both? It’s unfortunate we don’t have any really good photos of arsenoclasite.

9th Dec 2023 02:00 UTCJason B. Smith Expert

I'll try and make a photo of mine this evening and replace the original. 

In looking at my own, verified gatehouseite, it is clearly in acicular yellow needles. Maybe it's a case where individual analysis is required, but the comments on the gatehouseite page suggest the reddish-brown crystals are probably most likely arsenoclasite. 

9th Dec 2023 06:16 UTCJason B. Smith Expert

https://www.mindat.org/photo-225111.html

I took a quick photo of the same sample tonight, so maybe it's a better image than before and can be taken off user only. 

9th Dec 2023 06:46 UTCHerwig Pelckmans

That's a great photo, thanks for adding it to mindat.

This new photo makes for the first thumbnail on this page to be replaced:
If one of the managers would do so, that would be nice.

9th Dec 2023 22:34 UTCRalph S Bottrill 🌟 Manager

An excellent photo thanks Jason, exactly what we were looking for! 
Header photos updated.
I am reluctant to go just on colour, gatehouseite varies from yellow to brownish orange and I suspect it’s crystal form may be more definitive ( bladed to thin prismatic rather than blocky).
 
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