New Mexico, USA
4.96 x 4.02 x 1.59 inches (12.59 x 10.20 x 4.05 cm)
This very delicate, soft and fragile mineral is Melanterite, which is a mineral form of an iron sulfate. The rock is solid, but the white, fibrous and "hairy" crystals on it are fine and surreal. This secondary sulfate is a bit of an oddity - at least visually - but, nonetheless, a nice representation of this unique material.
[Scale: 1 inch, with mark at 1 cm]
Estimate: $100 - up.
Condition report available upon request.
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