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Can you help make this a better article? What good localities have we missed? Can you supply pictures of better specimens than those we show here? Can you give us more and better information about the specimens from these localities? Can you supply better geological or historical information on these localities?

Below are some preliminary notes I have made about Arsenogoyazite. This entry and thread has been made as a place holder for information that you will hopefully contribute about Arsenogoyazite. It should be in no way be thought of as a claim I have staked out to write about this mineral, and in fact is an invitation for someone to step forward and create the article about this mineral. If you are so inclined and have questions about the format that such an article should have, go the The welcome topic at the top of the Best Minerals forum and read what has been posted there. Also take a look at some of the more mature articles that have already been written like Rhodochrosite, Adamite, Millerite etc. You will need also to pick out other images of Arsenogoyazite that will go into the article.



ArsenogoyaziteSrAl₃<(OH) ₅|(AsO₄)₂> · H₂O Trigonal




Arsenogoyazite Micro? and rare species collections.
(Sr,Ca,Ba)Al3(AsO4,PO4)2(OH,F)5·H2O
This is a fairly rare mineral that is found sparingly at less than a half dozen localities. “Crystals indistinctly rhombohedral,…to 30 μm, aggregated into reniform crusts with a radial structure.”1
1 Handbook of Mineralogy, Volume IV, Anthony, Bideaux, Bladh, Nichols, p34.
Ask Boots and Tony how much of this there is.


ArsenogoyaziteGermanyBaden-Württemberg, Black Forest, Wolfach, Oberwolfach, Rankach valley, Clara Mine


Arsenogoyazite
Namibia
Tsumeb. “Forms white rhombohedrons, less than 1 mm in size growing on quartz and hematite.”1 Certainly they are substantially less than 1 mm in size.
1 Tsumeb, Georg Gebhard, 1999, p253.

Arsenogoyazite
Germany
Black Forest, Oberwolfach, Clara Mine. “It is white, yellowish, or pale green to grayish green; translucent; luster vitreous; with no cleavage but conchoidal fracture. The mineral forms crusts on quartz and barite in association with malachite, brochantite, olivenite, barium-pharmacosiderite, and sulfate-free weilerite. The crusts have a reniform appearance. Indistinct rhombohedron-like faces can be observed on the surface of the crusts. In the case of small tabular crystals, (0001) is also present.”1
1 American Mineralogist, Vol.71, p.845, 1986.



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