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Loughlinite

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About LoughliniteHide

Gerald Francis Loughlin
Formula:
Na2Mg3Si6O16 · 8H2O
Colour:
White
Lustre:
Silky, Pearly, Dull
Hardness:
1
Specific Gravity:
2.165
Crystal System:
Orthorhombic
Member of:
Name:
Named in honor of the late Dr. Gerald Francis Loughlin [December 11, 1880 Hyde Park, MA, USA - October 22, 1946], former Chief Geologist of the United States Geological Survey.
Fibrous white vein filling.


Classification of LoughliniteHide

Approved
First Published:
1960
9.EE.25

9 : SILICATES (Germanates)
E : Phyllosilicates
E : Single tetrahedral nets of 6-membered rings connected by octahedral nets or octahedral bands
74.3.1b.3

74 : PHYLLOSILICATES Modulated Layers
3 : Modulated Layers with joined strips
14.4.12

14 : Silicates not Containing Aluminum
4 : Silicates of Mg

Physical Properties of LoughliniteHide

Silky, Pearly, Dull
Transparency:
Translucent
Colour:
White
Streak:
white
Hardness:
Tenacity:
Flexible
Fracture:
Fibrous
Density:
2.165 g/cm3 (Measured)    

Optical Data of LoughliniteHide

Type:
Biaxial (+)
RI values:
nα = 1.500 nβ = 1.505 nγ = 1.525
2V:
Measured: 60° , Calculated: 54°
Birefringence:
0.025
Max Birefringence:
δ = 0.025
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
relatively weak
Optical Extinction:
Parallel.

Chemical Properties of LoughliniteHide

Formula:
Na2Mg3Si6O16 · 8H2O
Common Impurities:
Ti,Al,Fe

Crystallography of LoughliniteHide

Crystal System:
Orthorhombic
Cell Parameters:
a = 14.66 Å, b = 26.71 Å, c = 5.26 Å
Ratio:
a:b:c = 0.549 : 1 : 0.197
Unit Cell V:
2,059.65 ų (Calculated from Unit Cell)
Morphology:
Fibrous aggregates, usually parallel.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
12.8 (100)
7.60 (30)
4.80 (50)
4.45 (100)
3.79 (100)
3.65 (100)
2.90 (70)
Comments:
JCPDS 13-310

Type Occurrence of LoughliniteHide

Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA, 117717
Geological Setting of Type Material:
Originally found in dolomitic shale.
Reference:
Fahey, J.J., Ross, M., Axelrod, J.M. (1960) Loughlinite, a new hydrous sodium magnesium silicate. American Mineralogist: 45: 270-281.

Other Language Names for LoughliniteHide

German:Loughlinit
Spanish:Loughlinita

Relationship of Loughlinite to other SpeciesHide

Member of:
Other Members of this group:
Falcondoite(Ni,Mg)4Si6O15(OH)2 · 6H2OOrth.
Ferrisepiolite(Fe3+,Fe2+,Mg)4((Si,Fe3+)6O15)(O,OH)2 · 6H2OOrth. mmm (2/m 2/m 2/m)
SepioliteMg4(Si6O15)(OH)2 · 6H2OOrth. mmm (2/m 2/m 2/m) : Pnna

Common AssociatesHide

Associated Minerals Based on Photo Data:
Searlesite6 photos of Loughlinite associated with Searlesite on mindat.org.
Shortite1 photo of Loughlinite associated with Shortite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.EE.05BementiteMn7Si6O15(OH)8Mon.
9.EE.10BrokenhilliteMn8Si6O15(OH)10Hex. 6mm : P63mc
9.EE.10Pyrosmalite-(Fe)Fe2+8Si6O15(OH,Cl)10Trig. 3m (3 2/m) : P3m1
9.EE.10FriedeliteMn2+8Si6O15(OH,Cl)10Mon. 2/m : B2/m
9.EE.10Pyrosmalite-(Mn)Mn2+8Si6O15(OH,Cl)10Trig.
9.EE.10Mcgillite(Mn,Fe)8Si6O15(OH)8Cl2Mon. 2/m : B2/m
9.EE.15Nelenite(Mn,Fe)16(Si12O30)(OH)14[As3+3O6(OH)3]Mon.
9.EE.15SchalleriteMn2+16As3Si12O36(OH)17Trig. 3m : P3m1
9.EE.20Palygorskite(Mg,Al)5(Si,Al)8O20(OH)2 · 8H2OMon. 2/m : B2/m
9.EE.20TuperssuatsiaiteNa2Fe3Si8O20(OH)2 · 4H2OMon. 2/m : B2/m
9.EE.20YofortieriteMn5Si8O20(OH)2 · 8-9H2OMon. 2/m : B2/m
9.EE.20WindhoekiteCa2Fe3+2.67[Si8O20](OH)4 · 10H2O Mon. 2/m : B2/m
9.EE.25Falcondoite(Ni,Mg)4Si6O15(OH)2 · 6H2OOrth.
9.EE.25SepioliteMg4(Si6O15)(OH)2 · 6H2OOrth. mmm (2/m 2/m 2/m) : Pnna
9.EE.25Kalifersite(K,Na)5Fe3+7Si20O50(OH)6 · 12H2OTric.
9.EE.30GyroliteNaCa16Si23AlO60(OH)8 · 14H2OTric.
9.EE.30OrlymaniteCa4Mn3Si8O20(OH)6 · 2H2OHex.
9.EE.30TungusiteCa4Fe2Si6O15(OH)6
9.EE.35Reyerite(Na,K)2Ca14(Si,Al)24O58(OH)8 · 6H2OTrig.
9.EE.35Truscottite(Ca,Mn)14Si24O58(OH)8 · 2H2OTrig.
9.EE.40NatrosiliteNa2Si2O5Mon.
9.EE.45MakatiteNa2Si4O8(OH)2 · 4H2OMon. 2/m : P21/b
9.EE.50VarennesiteNa8Mn2Si10O25(OH,Cl)2 · 12H2OOrth.
9.EE.55RaiteNa4Mn2+3Ti0.25Si8O20(OH)2 · 10H2OOrth. 2 2 2 : C2 2 2
9.EE.60IntersiliteNa6Mn2+Ti[Si10O24(OH)](OH)3 · 4H2OMon.
9.EE.65Shafranovskite(Na,K)6(Mn,Fe)3Si9O24 · 6H2OTrig.
9.EE.65ZakharoviteNa4Mn5Si10O24(OH)6 · 6H2OTrig.
9.EE.70ZeophylliteCa13Si10O28(OH)2F8 · 6H2OTrig. 3 : R3
9.EE.75Minehillite(K,Na)2-3Ca28Zn4Al4Si40O112(OH)16Hex.
9.EE.80Fedorite(Na,K)2-3(Ca4Na3)Si16O38(OH,F)2 · 3.5H2OTric. 1 : P1
9.EE.80Martinite(Na,◻,Ca)12Ca4(Si,S,B)14B2O38(OH,Cl)2F2·4H2OTric. 1 : P1
9.EE.85Lalondeite(Na,Ca)6(Ca,Na)3Si16O38(F,OH)2·3H2OTric. 1 : P1

Related Minerals - Dana Grouping (8th Ed.)Hide

74.3.1b.1SepioliteMg4(Si6O15)(OH)2 · 6H2OOrth. mmm (2/m 2/m 2/m) : Pnna
74.3.1b.2Falcondoite(Ni,Mg)4Si6O15(OH)2 · 6H2OOrth.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.4.1ForsteriteMg2SiO4Orth. mmm (2/m 2/m 2/m)
14.4.2EnstatiteMgSiO3Orth. mmm (2/m 2/m 2/m) : Pbca
14.4.3ClinoenstatiteMgSiO3Mon. 2/m : P21/b
14.4.4ChrysotileMg3(Si2O5)(OH)4Mon.
14.4.5ClinochrysotileMon. 2/m
14.4.6OrthochrysotileOrth.
14.4.7ParachrysotileOrth.
14.4.8LizarditeMg3(Si2O5)(OH)4
14.4.9TalcMg3Si4O10(OH)2Tric. 1 : P1
14.4.10SpadaiteMgSiO2(OH)2 · H2O (?)
14.4.11SepioliteMg4(Si6O15)(OH)2 · 6H2OOrth. mmm (2/m 2/m 2/m) : Pnna
14.4.13EifeliteKNa3Mg4Si12O30Hex.
14.4.14Stevensite(Ca,Na)xMg3-x(Si4O10)(OH)2Mon.
14.4.15AntigoriteMg3(Si2O5)(OH)4Mon. m : Bm
14.4.16 Magnesio-anthophyllite☐{Mg2}{Mg5}(Si8O22)(OH)2

Fluorescence of LoughliniteHide

Not fluorescent.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for LoughliniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Fahey, J.J., Ross, M., Axelrod, J.M. (1960) Loughlinite, a new hydrous sodium magnesium silicate. American Mineralogist: 45: 270-281.
Fleischer, M. (1961) New mineral names. American Mineralogist: 46: 464-468.
Biedl, A., Preisinger, A. (1962) Die Struktur des Loughlinit (Natrium-Sepiolith). Fortschritte der Mineralogie: 40: 50-51.
International Mineralogical Association (1962) International Mineralogical Association: Commission on new minerals and mineral names. Mineralogical Magazine: 33: 260-263.
Kadir, S., Bas, H., Karakas, Z. (2002) Origin of sepiolite and loughlinite in a neogene volcano-sedimentary lacustrine environment, Mihaliccik-Eskisehir, Turkey. The Canadian Mineralogist: 40: 1091-1102.

Internet Links for LoughliniteHide

Localities for LoughliniteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Turkey
 
  • Central Anatolia Region
    • Eskişehir Province
      • Mihaliççik
Echle, W. (1967): Contributions to Mineralogy and Petrology 14, 86-101.
USA
 
  • Utah
    • Duchesne Co.
UGMS Bull 117 Minerals and Mineral Localities of Utah
    • Uintah Co.
      • Uteland Knoll District (Ouray District)
        • Ouray
Min Rec 8:5 p369
  • Wyoming
    • Sweetwater Co.
      • Green River Formation
Am Min 45:270-281
Am Min 45:270-281
Am Min 46:420-429
Mineral and/or Locality  
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