Barringtonite Mineral Data

Barringtonite Mineral Data +

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General Barringtonite Information

Chemical Formula:

MgCO3·2(H2O)

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

Empirical Formula:

Mg(CO₃)·2(H₂O)

Environment:

Found with nesquehonite on the surfaces of olivine basalt.

IMA Status:

Approved IMA 1965

Locality:

Barrington Tops, NSW, Australia. Link to MinDat.org Location Data.

Name Origin:

After its locality.

Barringtonite Image

Images:

Click Here for Larger Barringtonite Image

Barringtonite Lansfordite

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

Axial Ratios:

a:b:c =1.5209:1:1.0119

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

Crystal System:

TriclinicSpace Group: P1 or P1

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.936(1), 3.093(1), 8.682(1),

Physical Properties of Barringtonite

Cleavage:

[001] Distinct, [100] Distinct, [010] Distinct

Color:

Colorless.

Density:

2.83

Diaphaniety:

Transparent

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Nodular - Tuberose forms having irregular protuberances over the surface.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Streak:

white

Optical Properties of Barringtonite

Gladstone-Dale:

CI meas= 0.314 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.233 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1887,KPDmeas= 0.1687,KC= 0.2459

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

Electron Density:

r_electron=2.61 gm/cc
note: r_{Barringtonite}=2.53 gm/cc.

Fermion Index

Fermion Index = 0.02161
Boson Index = 0.97839

Photoelectric:

PE_{Barringtonite}= 0.67 barns/electron
U=PE_{Barringtonite} x r_electron= 1.76 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Barringtonite is Not Radioactive

Barringtonite Classification

Dana Class:

15.1.5.1 (15)Hydrated Carbonates

(15.1)where A+ (XO3) · x(H2O)

(15.1.5)Dana Group

15.1.5.1 Barringtonite MgCO3·2(H2O) P1 or P1 Tri

Strunz Class:

V/D.01-10 V - Nitrates, Carbonates and Borates

V/D - Water-bearing carbonates without unfamiliar anions

V/D.01 - Barringtonite - Ikaite series

V/D.01-10 Barringtonite MgCO3·2(H2O) P1 or P1 Tri

V/D.01-20 Nesquehonite Mg(HCO3)(OH)·2(H2O) P 2₁/n 2/m

V/D.01-30 Lansfordite MgCO3·5(H2O) P 2₁/a 2/m

V/D.01-40 Hellyerite NiCO3·6(H2O) C 2/c 2/m

V/D.01-50 Monohydrocalcite CaCO3·(H2O) P 3₁12 3 2

V/D.01-60 Ikaite CaCO3·6(H2O) C 2/c or Cc Mono

Other Barringtonite Information

References:

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

See Also:

Links to other databases for Barringtonite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris

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Print or Cut-and-Paste your Barringtonite Specimen Label here :

Barringtonite

MgCO3·2(H2O)
Dana No: 15.1.5.1 Strunz No: V/D.01-10
Locality:

Notes: