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Cappelenite-(Y)

• 
  Natrolittodden, Vesle Arøya, Langesundsfjorden, Larvik, Vestfold, Norway
  © Peter Andresen

• Formula:
  Ba(Y,Ce)₆Si₃B₆O₂₄F₂

• System: Trigonal

• Name:
  Named in honor of the finder, Diderik Cappelen (1856-1935), a Norwegian ironwork owner, chamberlain and mineralogist from Ulefoss

• IMA Status: Valid (Approved)

• Type Locality:
  Natrolittodden, Vesle Arøya, Langesundsfjorden, Larvik, Vestfold, Norway

• Dana 8th: 54.2.3.1
  
  54 : NESOSILICATES Borosilicates and Some Beryllosilicates
  2 : Borosilicates and Some Beryllosilicates with B in [4] coordination

• Hardness (Mohs): 6 - 6½

• Density: 4.407 g/cm³ (measured)
  4.43 g/cm³ (calculated)

• Lustre: Greasy

• Colour: greenish-brown