Volkovskite & Hilgardite

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Boulby Mine, Loftus, North Yorkshire, England

Reference: 2418

Cross-section of mica like bladed Volkovskite formed over a small hemisphere of aggregated Hilgardite crystals. Unusual combination of two rare borates from the find of exceptional volkovskites 7 or 8 years ago at Boulby mine in Yorkshire. Ex. M. Freier collection

Formula: Volkovskite KCa₄[B₅O₈OH]₄[B(OH)₃]₂Cl ^. 4H₂O; Hilgardite Ca₂B₅O₉Cl ^. H₂O