Mineralogy Database

Barringtonite Mineral Data

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General Barringtonite Information

Help on Chemical  Formula: Chemical Formula: MgCO3•2(H2O)
Help on Composition: Composition: Molecular Weight = 120.34 gm
   Magnesium  20.20 %  Mg   33.49 % MgO
   Hydrogen    3.35 %  H    29.94 % H2O
   Carbon      9.98 %  C    36.57 % CO2
   Oxygen     66.47 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg(CO3)•2(H2O)
Help on Environment: Environment: Found with nesquehonite on the surfaces of olivine basalt.
Help on IMA Status: IMA Status: Approved IMA 1965
Help on Locality: Locality: Barrington Tops, NSW, Australia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Barringtonite + Pronunciation Say BARRINGTONITE

Barringtonite Image

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  Lansfordite   Barringtonite

Comments: Optical images of clusters of glassy lansfordite crystals and one white dehydrated barringtonite ? crystal. (AmMin, 88:1883).
Location: Crystals associated with the remains of a saguaro, Carnegiea gigantea from south and west central Arizona. Scale: Scale bar 800 µ-m.
© American Mineralogist

Barringtonite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.5209:1:1.0119
Help on Cell Dimensions: Cell Dimensions: a = 9.156, b = 6.02, c = 6.092, Z = 4; alpha = 94°, beta = 95.5°, gamma = 108.7° V = 315.82 Den(Calc)= 2.53
Help on Crystal System: Crystal System: Triclinic Space Group: P1 or P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.936(1), 3.093(1), 8.682(1),

Physical Properties of Barringtonite

Help on Cleavage: Cleavage: {001} Distinct, {100} Distinct, {010} Distinct
Help on Color: Color: Colorless.
Help on Density: Density: 2.83
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Habit: Habit: Nodular - Tuberose forms having irregular protuberances over the surface.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Streak: Streak: white

Optical Properties of Barringtonite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.314 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.236 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1879,KPDmeas= 0.1687,KC= 0.2459
Ncalc = 1.62 - 1.7
Help on Optical Data: Optical Data: Biaxial (+), a=1.458, b=1.473, g=1.501, bire=0.0430, 2V(Calc)=74, 2V(Meas)=73.7.

Calculated Properties of Barringtonite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.62 gm/cc
note: Specific Gravity of Barringtonite =2.54 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEBarringtonite = 0.67 barns/electron
U=PEBarringtonite x rElectron Density= 1.76 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Barringtonite is Not Radioactive

Barringtonite Classification

Help on  Dana Class: Dana Class: (15)Hydrated Carbonates
  (15.01)where A+ (XO3) � x(H2O)
  (15.01.05)Dana Group Barringtonite MgCO3•2(H2O) P1 or P1 Tri
Help on  Strunz Class: Strunz Class: 05.CA.15 05 - CARBONATES (NITRATES)
  05.C - Carbonates without Additional Anions, with H2O
  05.CA -With medium-sized cations
05.CA.15 Barringtonite MgCO3•2(H2O) P1 or P1 Tri

Other Barringtonite 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 Barringtonite :
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: 05.CA.15





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