Mineralpedia Details for Roscherite
Named after German mineral collector Walter Roscher. Roscherite can be found in granite and pegmatite cavities in localities including Germany, England, Brazil, and the USA including at the Tip Top mine here in Black Hills of South Dakota.
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/roscherite.pdf
Roscherite from Tip Top mine, Custer Co., South Dakota, United States
Red rosettes of Roscherite with acicular white Tiptopite and white balls of Englishite less than 1mm.
Dark, olive green crystal, 1mm. Unusually rare and large crystal for Roscherite (XRD).
The last two photos are lilac Ruscherite with pink Montgomeryite. A
The Roscherites at Tip Top are crystallized in a range of colors and the lilac colored crystals may be Zanazziite, the Mg member. The pink rosettes are Montgomeryite clusters to 1.5mm. These clusters, when viewed under the scope are very lustrous and distinct.