Sphalerite
U. S. Route 7 Expressway, Brookfield, Fairfield County, Connecticut, USA
Sphalerite crystals hosted by fault brecciated marble. Note the polysynthetically twinned crystals here, which strongly resemble the Thomaston Dam sphalerite crystal habit that is incorrectly and persistently called wurtzite simply because they are hexagaonal, even though the sphalerite twinning is obvious, the cleavage is wrong for wurtzite, and ...
© 2020 Harold Moritz