Volkovskite & Hilgardite

Reference: 2637

Areas of aggregated hilgardite crystals formed alongside bladed, mica like, Volkovskite. Unusual combination of two rare borates from the find of exceptional volkovskites 9 or 10 years ago at Boulby mine in Yorkshire.  An unknown grey coloured mineral (hydroboracite?) is also present.  Ex. M. Freier collection

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

Status: Sold

Dimensions: 60x38x38mm

Size: Miniature (M)