Hilgardite on Boracite

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

Status: Sold

Dimensions: 48x28x48mmmm

Size: Miniature (M)