October 13, 2023
ZINNWALDITE CRYSTALS ON QUARTZ * RARE !!! Cinovec, CZECH REPUBLIC
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ZINNWALDITE * zinnwaldite - rare mica variety on quartz * * nice specimen from famous czech locality * size: 88 X 50 X 44mmweight: 172g origin: CÍNOVEC /ZINNWALD/, North Bohemia , CZECH REPUBLIC Zinnwaldite is a very rare member of the mica group and is not wellknown even by mineral collectors.Zinnwaldite is darker colored than typical muscovite but lighter than phlogopite or biotite The dark color and density in the three iron containing micas increase with an increase in the iron and magnesium content. Zinnwaldite is difficult to distinguish from the other micas at least by ordinary methods and lacallity and enviroment are keys to identification. It is limited to special granites and their pegmatites. Zinnwaldite, like other micas, has a layered structure of lithium iron aluminum silicate sheets weakly bonded together by layers of potassium ions. These potassium ion layers produce the perfect cleavage. PRIORITY AIR MAIL SHIPPING TO WORLDWIDE 10-20 business days to deliver Shipping charges in accordance to weight If you have multiwins, please email to request a combined shipping total to save you on shipping costs.
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