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Only a small percentage of the Cassiterites from Viloco are associated with Tourmaline
as it is twinned
This specimen features several sharp
The crystals show good luster and excellent sharp faces
I bought it from a Russian mineral dealer in Munich in 2010
Vivianite on matrix orthorhombic Only a small percentage ofIsolated crystals of Vivianite on matrix from Tomokoni are notably hard to find, especially larger undamaged crystals like the one on this specimen. A razor sharp, highly lustrous prism of Vivianite is lying in a semi vug shaped indentation of the red altered sandstone matrix. The natural shape of the host rock is what allowed such a good sized crystal to form and remain protected during growth. Normally a crystal like this would have grown against
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