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GeneralAnnabergite from Johannes adit query

23rd Nov 2016 11:28 UTCKeith Compton 🌟 Manager

I not sure that this is Annabergite - photo iD 787094

Stated locality:

Johannes adit, Schwarzleo District, Schwarzleograben, Hütten, Leogang, Saalfelden, Salzburg, Austria

Maybe rhodochrosite?

Keith

23rd Nov 2016 11:50 UTCChristian Auer 🌟 Expert

Hello Keith,

I didn`t do SEM-EDS on this specific specimen but from several others from this mine and several other mines from this district.

They were all annabergite except one that was erythrite. These are very young secundary mineralisations on mainly tennantite ore.

Rhodochrosite isn`t known in the whole Schwarzleo district.

23rd Nov 2016 12:03 UTCKeith Compton 🌟 Manager

Hi Christian

Fair enough, I guess I just expected it to be more green.

I have no knowledge of the locality in question, just my initial reaction on seeing the pic.

Just wish I could take close up photos like you can.

Cheers

Keith

23rd Nov 2016 12:12 UTCReiner Mielke Expert

Annabergite can be white or even pink. Does not take much Co to make annabergite pink. On the other hand erythrite can be white or grey but I have never seen green erythrite, has anyone?

23rd Nov 2016 13:01 UTCChristian Auer 🌟 Expert

Just writing an articel about babanekite, a very similiar species, so I have just all ID`s I made in my hands.

Like this one: http://www.mindat.org/photo-758848.html

Ni 12 Atom% Co 6 Cu 5

http://www.mindat.org/photo-755218.html

Ni 8 Co 5 Mg 4 Cu 3

Colour doen`t help much in that case.

23rd Nov 2016 18:57 UTCReiner Mielke Expert

Thanks Christian,

Mindat will have to say babanekite is easily confused with erythrite and pink annabergite. I'll have to start analyzing any erythrite found with copper minerals. Back to the rock pile, I'm sure I saw some "erythrite" with a suite of copper sulphates here in Cobalt.

10th Mar 2017 12:03 UTCŁukasz Kruszewski Expert

Hmm, that is interesting. I think I have to consider these additional colouration/discolouration factors in the future (-;

10th Mar 2017 12:05 UTCŁukasz Kruszewski Expert

Btw, it's good to keep in mind that these minerals are not X3(AsO4)2.... but more like X2Y(AsO4)2....