Mineralogy Database

Buddingtonite Mineral Data

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General Buddingtonite Information

Help on Chemical  Formula: Chemical Formula: (NH4)AlSi3O8•0.5(H2O)
Help on Composition: Composition: Molecular Weight = 266.28 gm
   Aluminum  10.13 %  Al   19.15 % Al2O3
   Silicon   31.64 %  Si   67.69 % SiO2
   Hydrogen   1.51 %  H      -   % Calc as (NH4)2O
   Hydrogen   0.38 %  H     3.38 % H2O
   Nitrogen   5.26 %  N     9.78 % (NH4)2O
   Oxygen    51.07 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: (NH4)Al(Si3O8)•0.5(H2O)
Help on Environment: Environment: Plagioclase altered by ammonium-bearing waters.
Help on IMA Status: IMA Status: Approved IMA 1964
Help on Locality: Locality: Sulfur Bank mine, end of east arm of clear Lake, Lake Co. California. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Arthur Francis Buddington (1890-1980), American petrologist, Princeton University.
Help on Name Pronunciation: Name Pronunciation: Buddingtonite + Pronunciation Say BUDDINGTONITE

Buddingtonite Image

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Comments: Chalky massive buddingtonite.
Location: Sharon Heights, Menlo Park, San Mateo County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Buddingtonite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.6576:1:0.5514
Help on Cell Dimensions: Cell Dimensions: a = 8.571, b = 13.032, c = 7.187, Z = 4; beta = 112.7° V = 740.58 Den(Calc)= 2.39
Help on Crystal System: Crystal System: Monoclinic Space Group: P 21 or P 21/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.81(1), 6.52(0.96), 3.381(0.72),

Physical Properties of Buddingtonite

Help on Cleavage: Cleavage: {001} Good, {010} Distinct
Help on Color: Color: Colorless, White.
Help on Density: Density: 2.32
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Cryptocrystalline - Occurs as crystals too small to distinguish with the naked eye.
Help on Habit: Habit: Pseudomorphous - Occurs in the form of another mineral.
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luster: Luster: Vitreous - Dull
Help on Streak: Streak: white

Optical Properties of Buddingtonite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.194 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.159 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2225,KPDmeas= 0.2292,KC= 0.1919
Ncalc = 1.45 - 1.46
Help on Optical Data: Optical Data: Biaxial (+), a=1.53, b=1.531, g=1.534, bire=0.0040

Calculated Properties of Buddingtonite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.42 gm/cc
note: Specific Gravity of Buddingtonite =2.39 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.06
Boson Index = 0.94
Help on Photoelectric: Photoelectric: PEBuddingtonite = 1.52 barns/electron
U=PEBuddingtonite x rElectron Density= 3.70 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Buddingtonite is Not Radioactive

Buddingtonite Classification

Help on  Dana Class: Dana Class: (76)Tectosilicate Al-Si Framework
  (76.01)with Al-Si frameworks
  (76.01.02)Dana Group Buddingtonite (NH4)AlSi3O8•0.5(H2O) P 21 or P 21/m Mono
Help on  Strunz Class: Strunz Class: 09.FA.30 09 - SILICATES (Germanates)
  09.F - Tektosilicates without Zeolitic H2O
  09.FA -Tektosilicates without additional non-tetrahedral anions, (Al,B):Si = 1:1
09.FA.30 Buddingtonite (NH4)AlSi3O8•0.5(H2O) P 21 or P 21/m Mono
09.FA.30 Celsian BaAl2Si2O8 I21/c 2/m
09.FA.30 Anorthoclase (Na,K)AlSi3O8 C1 1
09.FA.30 Hyalophane (K,Ba)Al(Si,Al)3O8 C 2/m 2/m
09.FA.30 Orthoclase KAlSi3O8 C 2/m 2/m
09.FA.30 Microcline KAlSi3O8 C1 1
09.FA.30 Rubicline! (Rb,K)AlSi3O8 P1 1
09.FA.30 Sanidine (K,Na)(Si,Al)4O8 C 2/m 2/m

Other Buddingtonite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Buddingtonite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 09.FA.30





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