Lansfordite Mineral Data

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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)

Environment:

Stalactites pendant from the shale roof of an anthracite coal mine.

IMA Status:

Valid Species (Pre-IMA) 1888

Locality:

Nesquehoning, near Lansford, Carbon Co., Pennsylvania, USA. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Lansfordite + Pronunciation

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),

Forms:

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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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Crystal Structure:

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Liu B N , Zhou X T , Cui X S , Tang J G , Science in China , B33 (1990) p.1350-1356, Synthesis of lansfordite MgCO3*5H2O and its crystal structure investigation, Locality: synthetic

Physical Properties of Lansfordite

Cleavage:

{001} Perfect, {100} Distinct

Color:

Colorless, White.

Density:

1.7

Diaphaneity:

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
Ncalc = 1.47

Optical Data:

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

Calculated Properties of Lansfordite

Electron Density:

Bulk Density (Electron Density)=1.80 gm/cc
note: Specific Gravity of Lansfordite =1.71 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Lansfordite= 0.57 barns/electron
U=PE_Lansfordite x rElectron Density= 1.03 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Lansfordite is Not Radioactive

Lansfordite Classification

Dana Class:

15.01.06.01 (15)Hydrated Carbonates

(15.01)where A+ (XO3) · x(H2O)

(15.01.06)Dana Group

15.01.06.01 Lansfordite MgCO3•5(H2O) P 2₁/a 2/m

Strunz Class:

05.CA.10 05 - CARBONATES (NITRATES)

05.C - Carbonates without Additional Anions, with H2O

05.CA -With medium-sized cations

05.CA.10 Lansfordite MgCO3•5(H2O) P 2₁/a 2/m

Other Lansfordite Information

References:

NAME( AntBidBlaNic3) 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 - 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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Print or Cut-and-Paste your Lansfordite Specimen Label here :

Lansfordite

MgCO3•5(H2O)
Dana No: 15.01.06.01 Strunz No: 05.CA.10
Locality:

Notes: