Volkovskite & Hilgardite

Reference: 2897

Cross-section of mica like bladed Volkovskite over which crystalline aggregates of Hilgardite have formed.  Unusual combination of two rare borates from the find of exceptional volkovskites 9 or 10 years ago at the Boulby mine in Yorkshire. Ex. M. Freier collection.

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

Price: £45.00

Status: Available

Dimensions: 55x27x20mm

Size: Miniature (M)