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Bandylite

• 
  Queténa Mine (Queténa Prospect), Toki Cu deposit (Toki Cluster), Chuquicamata District, Calama, El Loa Province, Antofagasta Region, Chile
  © 2003 John H. Betts

• Formula:
  Cu[B(OH)₄]Cl

• System: Tetragonal

• Name:
  For Dr. Mark Chance Bandy (1900-1963), American mining engineer, mineralogist and mineral collector, who first collected the mineral.

• IMA Status: Valid (Grandfathered)

• Type Locality:
  Queténa Mine (Queténa Prospect), Toki Cu deposit (Toki Cluster), Chuquicamata District, Calama, El Loa Province, Antofagasta Region, Chile

• Dana 8th: 25.1.4.2
  
  25 : ANHYDROUS BORATES CONTAINING HYDROXYL OR HALOGEN
  1 : Monoborates

• Hardness (Mohs): 2½

• Density: 2.81 g/cm³ (measured)
  2.81 g/cm³ (calculated)

• Lustre: Vitreous,Pearly

• Diapheny: Transparent

• Diapheny: elastic

• Colour: Deep blue with greenish portions; cendre blue to Italian blue, becoming greener with atacamite inclusions; blue in transmitted light.

• Streak: Pale blue