Buddingtonite Mineral Data

General Buddingtonite Information

Chemical Formula: (NH4)AlSi3O8•0.5(H2O) 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 Empirical Formula: (NH₄)Al(Si₃O₈)•0.5(H₂O) Environment: Plagioclase altered by ammonium-bearing waters. IMA Status: Approved IMA 1964 Locality: Sulfur Bank mine, end of east arm of clear Lake, Lake Co. California. Link to MinDat.org Location Data. Name Origin: Named for Arthur Francis Buddington (1890-1980), American petrologist, Princeton University. Name Pronunciation: Buddingtonite + Pronunciation  

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Buddingtonite Crystallography

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

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Mookherjee M , Redfern S A T , Swainson I , Harlov D E , Physics and Chemistry of Minerals , 31 (2004) p.643-649, Low-temperature behaviour of ammonium ion in buddingtonite, [N(D/H)4AlSi3O8] from neutron powder diffraction, Sample: T = 11 K View Additional jPOWD Structure files for Buddingtonite [1] [2]

 

Physical Properties of Buddingtonite

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

Optical Properties of Buddingtonite

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 Optical Data: Biaxial (+), a=1.53, b=1.531, g=1.534, bire=0.0040  

Calculated Properties of Buddingtonite

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

Buddingtonite Classification

Dana Class: 76.01.02.01 (76)Tectosilicate Al-Si Framework   (76.01)with Al-Si frameworks   (76.01.02)Dana Group  

76.01.02.01 Buddingtonite (NH4)AlSi3O8•0.5(H2O) P 2₁ or P 2₁/m Mono

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

References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8) 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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