extremly rare ewaldite crystal

Yellow-brown hexagonal ewaldite crystal 2.5 mm long from Dolyhir Quarry. Ewaldite is an extremely rare mineral. © D.I. Green.

Crisial melynllwyd, chweochrog, 2.5 mm o hyd o ewaldit o Chwarel Dôl-hir. Mae ewaldit yn fwyn prin iawn. © D.I. Green.

For more information, see the Museums online crystal gallery

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