Cyanotrichite forms velvety radial acicular crystal aggregates of extremely fine fibers.
2.
It occurs as blue to blue green tabular orthorhombic crystal aggregates in a secondary alkaline environment altering chalcosite.
3.
The type locality for Robertsite is the Tip Top mine, Custer County, South Dakota, US . Robertsite occurs at the Tip Top Mine as minute crystal aggregates and crusts found on quartz associated with triphylite.
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