Hilgardite on Boracite

Boulby Mine, Loftus, North Yorkshire, England

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

Status: Sold

Dimensions: 48x28x48mmmm

Size: Miniature (M)

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