CaCu(AsO4)(OH) is a relatively common arsenate mineral. This sample is from Gold Hill Mine, Toole, Co. Utah. What do you think? Do you want it on your wall?
This from Kingwood Center in August, 2006. Wikipedia says it is native to Northeastern Africa and part of the Arabian Peninsula. It is grown else where as an ornamental grass. It is perennial growing from rhizomes to about 30" in height.
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