Hilgardite on Boracite

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Boulby Mine, Loftus, North Yorkshire, England

Reference: 1906

Boulby specimen with rich areas of massive and crystalline orange-pink Hilgardite intermixed with small but well formed pale-blue Boracite crystals. Borate specimens are difficult to come by nowadays as Boulby has stopped working the Sylvinite seam in which the borates occurred.

Formulas: Hilgardite Ca₂B₅O₉Cl ^. H₂O; Boracite Mg₃B₇O₁₃Cl