Cyanotrichite (rare locality specimen)

Item Description

Here we have a notably hard to find specimen of Cyanotrichite from Idaho. Not only is Cyanotrichite rare from Idaho, but also from most secondary copper deposits in the United States. I think any knowledgeable collector will tell you that the Grandview Mine in Arizona is the most well-known locality for the species, but the second most productive mine could very well be the Peacock Mine in Lemhi County, Idaho. The specimens from Arizona are very similar to the Idaho material with similar radiating "velvety", tiny "hair-like" acicular groups of brilliant blue needles of Cyanotrichite associated with deep blue Azurite and green Malachite on oxidized matrix. This is a very attractive specimen of this seldom-seen material featuring beautiful acicular radiating Cyanotrichites that look fantastic under magnification along with the associated Azurite and Malachite on oxidized matrix. It should be noted that the authenticity of this locality was under debate, but was confirmed in Minerals News Vol 38 No. 4 (2022) by different sources. A great old-time specimen for any fan of secondary ore minerals, or specimens from Idaho.
From the collection of Geary Murdock