Loughlinite (original) (raw)
A valid IMA mineral species
About LoughliniteHide
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Formula:
Na2Mg3Si6O16 · 8H2O
Lustre:
Silky, Pearly, Dull
Crystal System:
Orthorhombic
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.
Typically found as fibrous white vein fillings in fractures in sodium rich rocks.
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:2441:5
66cf5f0b-5d35-4367-8f0d-17f2e2e6e1f5
IMA Classification of LoughliniteHide
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Type description reference:
Classification of LoughliniteHide
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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
Mineral SymbolsHide
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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference |
|---|---|---|
| Lou | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Lou | The Canadian Mineralogist (2019) | The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download |
| Lou | Warr (2020) | Warr, L.N. (2020) Recommended abbreviations for the names of clay minerals and associated phases. Clay Minerals, 55, 261–264 doi:10.1180/clm.2020.30 |
Physical Properties of LoughliniteHide
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Density:
2.165 g/cm3 (Measured) 2.22 g/cm3 (Calculated)
Optical Data of LoughliniteHide
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RI values:
_n_α = 1.500 _n_β = 1.505 _n_γ = 1.525
2V:
Measured: 60° , Calculated: 54°
δ = 0.025
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Dispersion:
relatively weak
Optical Extinction:
Parallel.
Chemistry of LoughliniteHide
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Mindat Formula:
Na2Mg3Si6O16 · 8H2O
Common Impurities:
Ti,Al,Fe
Crystallography of LoughliniteHide
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Crystal System:
Orthorhombic
Class (H-M):
m m m _(_2/_m_2/_m_2/m ) - Dipyramidal
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.
Comment:
Space Group: Pncn:
X-Ray Powder DiffractionHide
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 12.8 Å | (100) |
| 7.60 Å | (30) |
| 4.80 Å | (50) |
| 4.45 Å | (100) |
| 3.79 Å | (100) |
| 3.65 Å | (100) |
| 2.90 Å | (70) |
Geological EnvironmentHide
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Type Occurrence of LoughliniteHide
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General Appearance of Type Material:
Fibrous, to 1 cm; massive
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.
Associated Minerals at Type Locality:
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
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Relationship of Loughlinite to other SpeciesHide
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Other Members of this group:
| Falcondoite | (Ni,Mg)4Si6O15(OH)2 · 6H2O | Orth. |
|---|---|---|
| Ferrisepiolite | (Fe3+,Fe2+,Mg)4((Si,Fe3+)6O15)(O,OH)2 · 6H2O | Orth. m m m _(_2/_m_2/_m_2/m ) |
| Sepiolite | Mg4(Si6O15)(OH)2 · 6H2O | Orth. m m m _(_2/_m_2/_m_2/m ) : P n n a |
Common AssociatesHide
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Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
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| 9.EE. | Cairncrossite | Sr2Ca7-xNa2x(Si4O10)4(OH)2(H2O)15-x | Tric. 1 : _P_1 |
|---|---|---|---|
| 9.EE.05 | Bementite | Mn7Si6O15(OH)8 | Mon. |
| 9.EE.07 | Innsbruckite | Mn33(Si2O5)14(OH)38 | Mon. m : B m |
| 9.EE.10 | Brokenhillite | Mn8Si6O15(OH)10 | Hex. 6_m_ m : P_63_m c |
| 9.EE.10 | Pyrosmalite-(Fe) | Fe2+8Si6O15(OH,Cl)10 | Trig. 3_m_ _(_32/m ) : _P_3_m_1 |
| 9.EE.10 | Friedelite | Mn2+8Si6O15(OH,Cl)10 | Mon. 2/m : _B_2/m |
| 9.EE.10 | Pyrosmalite-(Mn) | Mn2+8Si6O15(OH,Cl)10 | Trig. 3_m_ _(_32/m ) : _P_3_m_1 |
| 9.EE.10 | Mcgillite | (Mn,Fe)8Si6O15(OH)8Cl2 | Mon. 2/m : _B_2/m |
| 9.EE.15 | Nelenite | (Mn,Fe)16(Si12O30)(OH)14[As3+3O6(OH)3] | Trig. 3_m_ _(_32/m ) : R_3_m |
| 9.EE.15 | Schallerite | Mn2+16As3Si12O36(OH)17 | Trig. 3_m_ : _P_3_m_1 |
| 9.EE.20 | Palygorskite | ◻Al2Mg2◻2Si8O20(OH)2(H2O)4 · 4H2O | Mon. 2/m : _B_2/m |
| 9.EE.20 | Tuperssuatsiaite | Fe3+Fe3+2(Na◻)◻2Si8O20(OH)2(H2O)4 · 2H2O | Mon. 2/m : _B_2/m |
| 9.EE.20 | Yofortierite | Mn2+Mn2+2Mn2+2◻2Si8O20(OH)2(H2O)4 · 4H2O | Mon. 2/m : _B_2/m |
| 9.EE.20 | Windhoekite | Fe3+(Fe3+1.67◻0.33)Ca2◻2Si8O20(OH)2(H2O)4(OH)2 · 6H2O | Mon. 2/m : _B_2/m |
| 9.EE.20 | Unnamed (Na-Ca-Fe-Silicate-Hydrate) | NaCa(Fe2+,Al,Mn)5[Si8O19(OH)](OH)7 · 5H2O | Tric. 1 : _P_1 |
| 9.EE.20 | Windmountainite | ◻Fe3+2Mg2◻2Si8O20(OH)2(H2O)4 · 4H2O | Mon. 2/m : _B_2/m |
| 9.EE.20 | Ikorskyite | KMn3+(Si4O10) · 3H2O | Mon. 2/m : _P_21/b |
| 9.EE.25 | Falcondoite | (Ni,Mg)4Si6O15(OH)2 · 6H2O | Orth. |
| 9.EE.25 | Sepiolite | Mg4(Si6O15)(OH)2 · 6H2O | Orth. m m m _(_2/_m_2/_m_2/m ) : P n n a |
| 9.EE.25 | Kalifersite | (K,Na)5Fe3+7Si20O50(OH)6 · 12H2O | Tric. 1 : _P_1 |
| 9.EE.30 | Gyrolite | NaCa16Si23AlO60(OH)8 · 14H2O | Tric. 1 : _P_1 |
| 9.EE.30 | Orlymanite | Ca4Mn3Si8O20(OH)6 · 2H2O | Hex. |
| 9.EE.30 | Tungusite | Ca4Fe2Si6O15(OH)6 | Tric. 1 : _P_1 |
| 9.EE.35 | Reyerite | (Na,K)2Ca14(Si,Al)24O58(OH)8 · 6H2O | Trig. 3 : _P_3 |
| 9.EE.35 | Truscottite | (Ca,Mn)14Si24O58(OH)8 · 2H2O | Trig. |
| 9.EE.35 | Kodamaite | Na3(Ca5Na)Si16O36(OH)4F2 · (14-x)H2O | Tric. 1 : _P_1 |
| 9.EE.40 | Natrosilite | Na2Si2O5 | Mon. 2/m : _P_21/b |
| 9.EE.45 | Makatite | Na2Si4O8(OH)2 · 4H2O | Mon. 2/m : _P_21/b |
| 9.EE.50 | Varennesite | Na8Mn2Si10O25(OH,Cl)2 · 12H2O | Orth. m m m _(_2/_m_2/_m_2/m ) : C m c m |
| 9.EE.55 | Raite | Mn2+Mn2+2Na2(◻1.75Ti0.25)Si8O20(OH)2(H2O)4 · Na(H2O)6 | Orth. 222 : _C_222 |
| 9.EE.60 | Intersilite | Na6Mn2+Ti[Si10O24(OH)](OH)3 · 4H2O | Mon. |
| 9.EE.65 | Shafranovskite | Na3K2(Mn,Fe,Na)4[Si9(O,OH)27](OH)2 · nH2O | Trig. 3_m_ : P_31_c |
| 9.EE.65 | Zakharovite | Na4Mn5Si10O24(OH)6 · 6H2O | Trig. 3_m_ |
| 9.EE.70 | Zeophyllite | Ca13Si10O28(OH)2F8 · 6H2O | Trig. 3 : _R_3 |
| 9.EE.75 | Minehillite | (K,Na)2-3Ca28Zn4Al4Si40O112(OH)16 | Hex. |
| 9.EE.80 | Fedorite | (Na,K)2-3(Ca4Na3)Si16O38(OH,F)2 · 3.5H2O | Tric. 1 : _P_1 |
| 9.EE.80 | Martinite | (Na,◻,Ca)12Ca4(Si,S,B)14B2O38(OH,Cl)2F2 · 4H2O | Tric. 1 : _P_1 |
| 9.EE.80 | Ellingsenite | Na5Ca6Si18O38(OH)13 · 6H2O | Tric. 1 : _P_1 |
| 9.EE.85 | Lalondeite | (Na,Ca)6(Ca,Na)3Si16O38(F,OH)2 · 3H2O | Tric. 1 : _P_1 |
Fluorescence of LoughliniteHide
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Other InformationHide
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Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for LoughliniteHide
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References for LoughliniteHide
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Localities for LoughliniteHide
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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
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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and 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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
| China | |
|---|---|
| Xinjiang Yili Hasake Autonomous Prefecture (Ili Kazakh Autonomous Prefecture) Tacheng Prefecture (Tarbaghatay Prefecture) Junggar Basin ⓘ Fengcheng Formation | ZHANG et al. (2018) |
| Namibia | |
| Oshikoto Region Omuthiyagwiipundi ⓘ Etosha Pan | Buch et al. (1996) |
| Pacific Ocean | |
| Conical Seamount ⓘ Deep Sea Drilling Project Hole 779A | Fryer et al. (1992) |
| South Africa | |
| Northern Cape ZF Mgcawu District Municipality Dawid Kruiper Local Municipality ⓘ Koi Pan | Roelofse (2010) |
| Mier ⓘ Brak Pan | Roelofse (2010) |
| Turkey | |
| Ankara Province Beypazari District ⓘ Beypazarı trona deposit | Helvaci (1998) |
| Eskişehir Province Mihaliççik District ⓘ Killik | Echle (1967) |
| USA | |
| ⓘ Green River Formation | Tank (1972) +1 other reference |
| Utah Duchesne County ⓘ Green River Formation outcrops | Bullock (1981) |
| Uintah County Uteland Knoll Mining District (Ouray Mining District) Ouray ⓘ South Ouray No. 1 well | Milton (1977) |
| Wyoming Sweetwater County Green River Basin ⓘ Westvaco mine (TL) | Fahey et al. (1960) +1 other reference |
| ⓘ John Hay Jr. Well No. 1 | Fahey et al. (1960) |
| ⓘ Union Pacific Well No. 4 | Fahey et al. (1960) |