Loughlinite Mineral Data

General Loughlinite Information

Chemical Formula:

Na2Mg3Si6O16•8(H2O)

Composition:

Molecular Weight = 687.52 gm

Sodium 6.69 % Na 9.01 % Na₂O

Magnesium 10.61 % Mg 17.59 % MgO

Silicon 24.51 % Si 52.44 % SiO₂

Hydrogen 2.35 % H 20.96 % H₂O

Oxygen 55.85 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₂Mg₃Si₆O₁₆•8(H₂O)

Environment:

In dolomitic oil-shale.

IMA Status:

Approved IMA 1960

Locality:

Green River, Sweetwater Coundy, Wyoming, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Gerald Francis Loughlin (1880-1946), chief geologist, U. S. Geological Survey.

Name Pronunciation:

Loughlinite + Pronunciation

Loughlinite Image

Images:

Loughlinite Bradleyite

Comments: Silky fibrous veinlets of loughlinite with bradleyite.
Location: Green River area, Sweetwater County, Wyoming, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Loughlinite Crystallography

Crystal System:

OrthorhombicSpace Group: Unk

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

By Intensity(I/I_o): 12.9(1), 4.34(0.18), 4.51(0.07),

Physical Properties of Loughlinite

Color:

Pearl white.

Density:

2.165

Habit:

Massive - Fibrous - Distinctly fibrous fine-grained forms.

Luster:

Silky

Streak:

white

Optical Properties of Loughlinite

Gladstone-Dale:

CI meas= -0.013 (Superior) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.2356,KC= 0.2326
Ncalc = 1.5

Optical Data:

Biaxial (+), a=1.5, b=1.505, g=1.525, bire=0.0250, 2V(Calc)=54, 2V(Meas)=60.

Calculated Properties of Loughlinite

Electron Density:

Bulk Density (Electron Density)=2.20 gm/cc
note: Specific Gravity of Loughlinite =2.17 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Loughlinite= 1.33 barns/electron
U=PE_Loughlinite x rElectron Density= 2.94 barns/cc.

Radioactivity:

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

Loughlinite Classification

Dana Class:

74.03.01b.03 (74)Phyllosilicate Modulated Layers

(74.03)with joined strips

(74.03.01b)Palygorskite-sepiolite group (Sepiolite subgroup)

74.03.01b.01 Sepiolite Mg4Si6O15(OH)2•6(H2O) Pnan 2/m 2/m 2/m

74.03.01b.02 Falcondoite (Ni,Mg)4Si6O15(OH)2•6(H2O) Pncn 2/m 2/m 2/m

74.03.01b.03 Loughlinite Na2Mg3Si6O16•8(H2O) Unk Ortho

Strunz Class:

09.EE.25 09 - SILICATES (Germanates)

09.E - Phyllosilicates

09.EE -Single tetrahedral nets of 6-membered rings

09.EE.25 Falcondoite (Ni,Mg)4Si6O15(OH)2•6(H2O) Pncn 2/m 2/m 2/m

09.EE.25 Loughlinite Na2Mg3Si6O16•8(H2O) Unk Ortho

09.EE.25 Kalifersite! (K,Na)5Fe7Si20O50(OH)6•12(H2O) P1 1

09.EE.25 Sepiolite Mg4Si6O15(OH)2•6(H2O) Pnan 2/m 2/m 2/m

Other Loughlinite Information

References:

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

See Also:

Links to other databases for Loughlinite :
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 Loughlinite Specimen Label here :

Loughlinite

Na2Mg3Si6O16•8(H2O)
Dana No: 74.03.01b.03 Strunz No: 09.EE.25
Locality:

Notes: