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Boracite: Mg3B7O13Cl
Comments: Clear, pale green pseudo-cubic boracite crystal. Location: Sonderhausen, Thuringia, Germany. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals
Comments: A greenish crystal of boracite, a tetrahedron modified by cube and dodecahedral faces. Location: Bernburg, Sachsen-Anhalt, Germany. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Boracite: Mg3B7O13Cl Hilgardite: Ca2B5O9Cl·(H2O)
Comments: Sub-mm reddish orange crystals of hilgardite on white boracite. Location: Boulby Mine, Loftus, Cleveland, Great Britain. Scale: 1.5 x 2.5 cm. © John Veevaert