Description: Sinkankasite Baker-Ferguson Mine, Keystone, Keystone District, Pennington County, South Dakota, USA Field of view is 2 mm This is another attempt with the Helicon Focus, I need one of those "Student Driver" signs to stick on my microscope. This Sinkankasite is from the type locallity at the Baker-Ferguson Mine, Keystone, Keystone District, Pennington County, South Dakota. The field of view is 2 mm

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