Cyanotrichite is a fragile mineral, and handling should be avoided, for even a slight touch can damage a crystal grouping. Cyanotrichite crystals will rub off and leave a blue residue of tiny crystals on a surface if handled.
http://www.minerals.net/mineral/cyanotrichite.aspx
https://www.pinterest.fr/pin/656751558135524308/
https://www.pinterest.fr/pin/266064290460766111
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