Boracite on Hilgardite

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Boulby Mine, Loftus, North Yorkshire, England

Reference: 2433

Attractive bright lustrous blue Boracite crystals formed over orange hilgardite. Nice contrasting specimen with a little additional magnesite. Borate specimens are difficult to come by nowadays as Boulby no longer mines the sylvinite seam in which the borates occurred.

Formulas: Hilgardite Ca₂B₅O₉Cl ^. H₂O; Boracite Mg₃B₇O₁₃Cl; Magnesite MgCO₃