Lansfordite Mineral Data

Lansfordite Mineral Data +

General Lansfordite Information

Chemical Formula:

MgCO3·5(H2O)

Composition:

Molecular Weight = 174.39 gm

Magnesium 13.94 % Mg 23.11 % MgO

Hydrogen 5.78 % H 51.65 % H₂O

Carbon 6.89 % C 25.24 % CO₂

Oxygen 73.40 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg(CO₃)·5(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1888

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 69476

PDF 35-680

Lansfordite Image

Images:

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

Lansfordite Crystallography

Axial Ratios:

a:b:c =1.6529:1:0.9721

Cell Dimensions:

a = 12.48, b = 7.55, c = 7.34, Z = 4; beta = 101.767° V = 677.07 Den(Calc)= 1.71

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/a

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

By Intensity(I/I_o): 3.85(1), 4.16(1), 5.8(0.8),

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Forms: [ 1 1 0] [ 1 1 1] [ 1 1 1] [ 0 1 1] [ 2 1 0] [ 1 0 0] [ 0 0 1]

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Physical Properties of Lansfordite

Cleavage:

[001] Perfect, [100] Distinct

Color:

Colorless, White.

Density:

1.7

Diaphaniety:

Transparent to Opaque

Hardness:

2.5 - Finger Nail

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Dull

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Lansfordite

Gladstone-Dale:

CI meas= -0.026 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.02 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2807,KPDmeas= 0.2824,KC= 0.2751

Optical Data:

Biaxial (+), a=1.465, b=1.468, g=1.507, bire=0.0420

Calculated Properties of Lansfordite

Electron Density:

r_electron=1.80 gm/cc
note: r_Lansfordite=1.71 gm/cc.

Fermion Index

Fermion Index = 0.01505
Boson Index = 0.98495

Photoelectric:

PE_Lansfordite= 0.57 barns/electron
U=PE_Lansfordite x r_electron= 1.03 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Lansfordite is Not Radioactive

Lansfordite Classification

Dana Class:

15.1.6.1 (15)Hydrated Carbonates

(15.1)where A+ (XO3) · x(H2O)

(15.1.6)Dana Group

15.1.6.1 Lansfordite MgCO3·5(H2O) P 2₁/a 2/m

Strunz Class:

V/D.01-30 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 Lansfordite Information

References:

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

See Also:

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

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

Lansfordite

MgCO3·5(H2O)
Dana No: 15.1.6.1 Strunz No: V/D.01-30
Locality:

Notes: