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Buddingtonite

• 
  Sharon Heights, Menlo Park, San Mateo Co., California, USA
  © Caltech

• Formula:
  (NH₄)AlSi₃O₈

• System: Monoclinic

• Name:
  Named in 1964 by Richard C. Erd, D. E. White, Joseph J. Fahey, and D. E. Lee in honor of Arthur Francis Buddington [November 29, 1890 Wilmington, Delaware - December 25, 1980 Quincy, Massachusetts]. Buddington was a mineralogist and petrologist, first at the Carnegie Geophysical Laboratory in Washington, DC and later professor at Princeton University, New Jersey.

• IMA Status: Valid (Grandfathered)
  Approved 1963

• Type Locality:
  Sulphur Bank Mine (Sulfur Bank Mine; Sulphur Bank deposits), Clear Lake Oaks, Sulphur Creek District (Sulfur Creek District; Wilbur Springs District), Lake Co., California, USA

• Dana 8th: 76.1.2.1
  
  76 : TECTOSILICATES Al-Si Framework
  1 : Al-Si Framework with Al-Si frameworks

• Hardness (Mohs): 5½

• Density: 2.32 g/cm³ (measured)
  2.38 g/cm³ (calculated)

• Lustre: Sub-Vitreous,Earthy

• Diapheny: Transparent

• Diapheny: brittle

• Colour: Colorless

• Streak: White