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Scawtite

A valid IMA mineral species - grandfathered
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Ca7(Si3O9)2CO3 · 2H2O
Colour:
Colourless
Lustre:
Vitreous
Hardness:
4½ - 5
Specific Gravity:
2.71
Crystal System:
Monoclinic
Name:
Named by Cecil Edgar Tilley (Professor of Petrology and Geology at Cambridge University) in 1930 after its discovery locality, Scawt Hill, Larne, Co. Antrim, Northern Ireland, UK.
Type Locality:
ⓘScawt Hill, Larne, Co. Antrim, Northern Ireland, UK
This page provides mineralogical data about Scawtite.


Unique Identifiers
IMA Formula:
Ca7(Si3O9)2(CO3) · 2H2O
First published:
1930
Type description reference:
Tilley, C. E. (1930) Scawtite, a new mineral from Scawt Hill, Co. Antrim.Mineralogical Magazine and Journal of the Mineralogical Society, 22 (128) 222-224doi:10.1180/minmag.1930.022.128.03

Classification of Scawtite
Dana 8th ed.:
64.2.1.1

64 : CYCLOSILICATES Rings with Other Anions and Insular Silicate Groups
2 : Rings with Other Anions and Insular Silicate Groups: 3-membered rings with other anion groups
Hey's CIM Ref.:
17.4.4

17 : Silicates Containing other Anions
4 : Silicates with carbonates

Mineral Symbols
Transparency:
Transparent
Colour:
Colourless
Hardness:
4½ - 5 onMohs scale
Cleavage:
Imperfect/Fair
{010} fair
{100} poor
Density:
2.71 g/cm3 (Measured)    2.74 g/cm3 (Calculated)

Optical Data of Scawtite
Surface Relief:
Moderate
Dispersion:
r < v weak

Chemistry of Scawtite
Common Impurities:
Ti,Al,Fe,Mn,Mg

Chemical Analysis
Place of Conservation of Type Material:
The Natural History Museum, London, England, 1956,384
Geological Setting of Type Material:
Contact-metamorphosed limestones and dolostones intruded by diabase.
Associated Minerals at Type Locality:
AnalcimeBultfonteiniteCalciteFoshagiteGrossular
HillebranditeLarniteMelilite GroupSpurriteThomsonite Subgroup
Tobermorite
Reference:
Tilley, C.E. and Hey, M.H. (1930) Scawtite, a new mineral from Scawt Hill, Co. Antrim. Mineralogical Magazine: 22: 222-224.

Other Language Names for Scawtite

Common AssociatesTrig. 3m :R3m9.CK.Magnesio-dutrowiteNa(Mg2.5Ti0.5)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m :R3m9.CK.DarrellhenryiteNa(Al2Li)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m :R3m9.CK.Fluor-schorlNaFe2+3Al6(Si6O18)(BO3)3(OH)3FTrig. 3m :R3m9.CK.PrincivalleiteNa(Mn2Al)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m :R3m9.CK.Alumino-oxy-rossmanite◻Al3Al6(Si5AlO18)(BO3)3(OH)3OTrig. 3m :R3m9.CK.DutrowiteNa(Fe2+2.5Ti0.5)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m :R3m9.CK.Ferro-bosiiteNaFe3+3(Al4Fe2+2)(Si6O18)(BO3)3(OH)3OTrig. 3m :R3m9.CK.BosiiteNaFe3+3(Al4Mg2)(Si6O18)(BO3)3(OH)3OTrig. 3m :R3m9.CK.Celleriite◻(Mn2+2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m :R3m9.CK.05FeruviteCaFe2+3(Al5Mg)(Si6O18)(BO3)3(OH)3(OH)Trig. 3m :R3m9.CK.05Chromium-draviteNaMg3Cr3+6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m :R3m9.CK.05Fluor-rossmanite◻(Al2Li)Al6(Si6O18)(BO3)3(OH)3FTrig.3m(32/m) :R3m9.CK.05Oxy-schorlNa(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m :R3m9.CK.05Fluor-elbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3FTrig. 3m :R3m9.CK.05DraviteNaMg3Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m :R3m9.CK.05Oxy-uviteCaMg3Al6(Si6O18)(BO3)3(OH)3O9.CK.05Fluor-uviteCaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3FTrig. 3m :R3m9.CK.05Foitite◻(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m :R3m9.CK.05Vanadio-oxy-draviteNaV3(Al4Mg2)(Si6O18)(BO3)3(OH)3OTrig. 3m :R3m9.CK.05Fluor-buergeriteNaFe3+3Al6(Si6O18)(BO3)3O3FTrig. 3m :R3m9.CK.05Unnamed (F analogue of feruvite)CaFe2+3(Al5Mg)(Si6O18)(BO3)3(OH)3F9.CK.05ErtliteNaAl3Al6(Si4B2O18)(BO3)3(OH)3OTrig. 3m :R3m9.CK.05TsilaisiteNaMn2+3Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m :R3m9.CK.05Fluor-liddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3FTrig. 3m :R3m9.CK.05UviteCaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3(OH)Trig. 3m :R3m9.CK.05ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m :R3m9.CK.05Fluor-tsilaisiteNaMn2+3Al6(Si6O18)(BO3)3(OH)3FTrig. 3m :R3m9.CK.05Oxy-foitite◻(Fe2+Al2)Al6(Si6O18)(BO3)3(OH)3OTrig.3m(32/m) :R3m9.CK.05LiddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m :R3m9.CK.05Vanadio-oxy-chromium-draviteNaV3(Cr4Mg2)(Si6O18)(BO3)3(OH)3OTrig. 3m :R3m9.CK.05Rossmanite◻(LiAl2)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m :R3m9.CK.05Oxy-vanadium-draviteNaV3(V4Mg2)(Si6O18)(BO3)3(OH)3OTrig. 3m :R3m9.CK.05OleniteNaAl3Al6(Si6O18)(BO3)3O3(OH)Trig. 3m :R3m9.CK.05UM2000-64-SiO:BFeHKMg(K,Na)Fe3+3(Mg2Fe3+4)Si6O18(BO3)3(OH)3O9.CK.05Magnesio-lucchesiiteCaMg3Al6(Si6O18)(BO3)3(OH)3OTrig. 3m :R3m9.CK.05PovondraiteNaFe3+3(Mg2Fe3+4)(Si6O18)(BO3)3(OH)3OTrig. 3m :R3m9.CK.05LucchesiiteCaFe2+3 Al6(Si6O18)(BO3)3(OH)3OTrig. 3m :R3m9.CK.05Chromo-alumino-povondraiteNaCr3(Al4Mg2)(Si6O18)(BO3)3(OH)3OTrig. 3m :R3m9.CK.05Fluor-draviteNaMg3Al6(Si6O18)(BO3)3(OH)3FTrig. 3m :R3m9.CK.05Oxy-draviteNa(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3OTrig. 3m :R3m9.CK.05Oxy-chromium-draviteNaCr3(Cr4Mg2)(Si6O18)(BO3)3(OH)3OTrig. 3m :R3m9.CK.05Oxy-rossmanite◻(Li0.5Al2.5)Al6(Si6O18)(BO3)3(OH)3O9.CK.05Luinaite-(OH)NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)Mon.m :Bm9.CK.05SchorlNaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m :R3m9.CK.05Magnesio-foitite◻(Mg2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m :R3m9.CK.05MaruyamaiteK(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3OTrig. 3m :R3m9.CK.10Abenakiite-(Ce)Na26Ce6(Si6O18)(PO4)6(CO3)6(SO2)OTrig.3 :R39.CK.20Thorosteenstrupine(Ca,Th,Mn)3Si4O11F · 6H2O9.CK.20Steenstrupine-(Ce)Na14Mn2+2Fe3+2Ce6Zr(Si6O18)2(PO4)6(PO3OH)(OH)2 · 2H2OTrig.3m(32/m) :R3m

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    • References for ScawtiteⓘForster ProspectBottrill et al. (2008)
    China
     
    Liming Zhang et al. (1991)Cao Zhengmin et al. (1987)
    Cuba
     
    Chukanov (2014)
    Germany
     
    Tron et al. (1987)
    Hungary
     
    Kónya-MÁFI
    Indonesia
     
    Newman (1973)
    Ireland
     
    Bull. Soc. Franç. Minéralo. ...
    Italy
     
    Boscardin M. et al. (2011)50+2 other referencesCollections Alessandro Mattiello and ...+1 other referenceMattioli et al. (2014)
    Japan
     
    Matsuyama (2001)3+2 other referencesYamada (2004)Kusachi et al. (1991)+1 other reference
    New Zealand
     
    Mason (1957)+1 other referenceBaker et al. (1980)
    Norway
     
    Jamtveit et al. (1997)
    Poland
     
    Łukasz Kruszewski PXRD data
    Romania
     
    Marincea+2 other references
    UK
     
    McConnell (1954)+3 other referencesHenmi et al. (1973)Tilley (1930)+2 other referencesAgrell (1965)
    USA
     
    Anthony et al. (1995)Murdoch (1955)+1 other referenceMurdoch (1954)+3 other referencesTaylor (1935)+2 other references
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