Niccolite and sphalerite. Settlingstones Mine, North Pennines, Britain




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250µm


Niccolite showing the typical radiating habit (centre), known as an 'ice flower' texture. The strong anisotropy of niccolite is well seen. Sphalerite (grey, bottom centre) shows light-colored internal reflections.


Polished block, plane polarized light, x 80, air



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