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Althausite

• 
  Tingelstadtjern Quarry, Modum, Buskerud, Norway
  © K.E.Larsen

• Formula:
  Mg₂(PO₄)(OH,F)

• System: Orthorhombic

• Name:
  Named in 1975 by Gunnar Raade and Magne Tysseland in honor of Prof. Egon Althaus (February 15, 1933-), mineralogist at University of Karlsruhe, Germany.

• IMA Status: Valid (Approved)

• Type Locality:
  Tingelstadtjern Quarry, Modum, Buskerud, Norway

• Dana 8th: 41.6.5.1
  
  41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
  6 : A₂(XO₄)Z_q

• Hardness (Mohs): 3½ - 4

• Density: 2.97 g/cm³ (measured)
  2.91 g/cm³ (calculated)

• Lustre: Sub-Vitreous,Resinous

• Diapheny: Translucent

• Diapheny: brittle

• Colour: Pale gray, reddish brown.