SUPPORT US. Covid-19 has significantly affected our fundraising. Please help!
Log InRegister
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat ArticlesThe ElementsBooks & Magazines
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsUsersMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice SettingsThe Mineral Quiz
Photo SearchPhoto GalleriesSearch by ColorNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryMineral Photography


This page is currently not sponsored. Click here to sponsor this page.
Hide all sections | Show all sections

About ScawtiteHide

Ca7(Si3O9)2CO3 · 2H2O
4 - 5
Specific Gravity:
Crystal System:
Named by Tilley in 1930 after its discovery locality, Scawt Hill, Larne, Co. Antrim, Northern Ireland, UK.
This page provides mineralogical data about Scawtite.

Classification of ScawtiteHide

Approved, 'Grandfathered' (first described prior to 1959)
First published:

9 : SILICATES (Germanates)
C : Cyclosilicates
K : [Si6O18]12- 6-membered single rings, with insular complex anions

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

17 : Silicates Containing other Anions
4 : Silicates with carbonates

Physical Properties of ScawtiteHide

4 - 5 on Mohs scale
{010} fair
{100} poor
2.71 g/cm3 (Measured)    2.74 g/cm3 (Calculated)

Optical Data of ScawtiteHide

Biaxial (+)
RI values:
nα = 1.597 - 1.603 nβ = 1.606 - 1.609 nγ = 1.618 - 1.621
Measured: 74° to 78°, Calculated: 72° to 84°
Max Birefringence:
δ = 0.021
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
r < v weak

Chemical Properties of ScawtiteHide

Ca7(Si3O9)2CO3 · 2H2O
IMA Formula:
Ca7(Si3O9)2(CO3) · 2H2O
Common Impurities:

Chemical AnalysisHide

Oxide wt%:
CaO46,4 %
SiO234,2 %
CO218,0 %
Total:98 %
Sample references:
1Scawt Hill, Larne, Co. Antrim, Northern Ireland, UKTilley, C.E. and Hey, M.H. (1930) Scawtite, a new mineral from Scawt Hill, Co. Antrim. Mineralogical Magazine, vol. 22, n

Crystallography of ScawtiteHide

Crystal System:
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 10.12 Å, b = 15.18 Å, c = 6.62 Å
β = 100.55°
a:b:c = 0.667 : 1 : 0.436
Unit Cell V:
999.78 ų (Calculated from Unit Cell)

Crystal StructureHide

Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Display Options
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
CIF File    Best | x | y | z | a | b | c
Stop | Start
Console Off | On | Grey | Yellow
IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0000391ScawtitePluth J J, Smith J V (1973) The crystal structure of scawtite Note sample is from Crestmore, California, USA American Mineralogist 58 1097-109719730293
0006058ScawtiteGrice J D (2005) The structure of spurrite, tilleyite and scawtite, and relationships to other silicate-carbonate minerals The Canadian Mineralogist 43 1489-15002005Scawt Hill, near Larne, County Antrim, Ireland0293
0020470ScawtiteZhang L, Fu P, Yang H, Yu K, Zhou Z (1992) Crystal structure of Scawtite Chinese Science Bulletin 37 930-9341992Zoulou iron deposit, Anhui Province, China0293
CIF Raw Data - click here to close

Type Occurrence of ScawtiteHide

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.

Other Language Names for ScawtiteHide

Simplified Chinese:片柱钙石

Common AssociatesHide

Associated Minerals Based on Photo Data:
4 photos of Scawtite associated with Plombièrite[Ca4Si6O16(OH)2 · 2H2O] · (Ca · 5H2O)
3 photos of Scawtite associated with TobermoriteCa4Si6O17(H2O)2 · (Ca · 3H2O)
3 photos of Scawtite associated with XonotliteCa6(Si6O17)(OH)2
2 photos of Scawtite associated with ThaumasiteCa3(SO4)[Si(OH)6](CO3) · 12H2O
1 photo of Scawtite associated with StringhamiteCaCu(SiO4) · H2O
1 photo of Scawtite associated with JenniteCa9(Si3O9)2(OH)8 · 8H2O

Related Minerals - Nickel-Strunz GroupingHide

9.CK.Fluor-schorlNa(Fe2+3)Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
9.CK.DarrellhenryiteNa(LiAl2)Al6(BO3)3Si6O18(OH)3O Trig. 3m : R3m
9.CK.AdachiiteCaFe3Al6(Si5AlO18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.BosiiteNaFe3+3(Al4Mg2)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.Celleriite◻(Mn2+2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.Alumino-oxy-rossmanite◻Al3Al6(Si5AlO18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.05Fluor-buergeriteNa(Fe3+3)Al6(Si6O18)(BO3)3O3FTrig. 3m : R3m
9.CK.05Chromium-draviteNa(Mg3)Cr3+6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05FeruviteCa(Fe2+)3MgAl5(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05Foitite(◻,Na)(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3OHTrig. 3m : R3m
9.CK.05LiddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05OleniteNa(Al3)Al6(Si6O18)(BO3)3O3(OH)Trig. 3m : R3m
9.CK.05PovondraiteNaFe3+3(Mg2Fe3+4)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.05SchorlNa(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05Magnesio-foitite(◻,Na)(Mg2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05Rossmanite◻(LiAl2)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05TsilaisiteNa(Mn2+)3Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05Oxy-vanadium-draviteNa(V)3(V4Mg2)Si6O18(BO3)3(OH)3OTrig. 3m : R3m
9.CK.05Oxy-draviteNa(MgAl2)MgAl5(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.05Luinaite-(OH)Na(Fe2+)3Al6(Si6O18)(BO3)3(OH)3(OH)Mon. m : Bm
9.CK.05Fluor-elbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
9.CK.05Chromo-alumino-povondraiteNa(Cr3)(Al4Mg2)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.05Fluor-draviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
9.CK.05Oxy-schorlNa(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.05Fluor-liddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
9.CK.05Oxy-chromium-draviteNa(Cr)3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O Trig. 3m : R3m
9.CK.05Fluor-tsilaisiteNa(Mn2+)3Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
9.CK.05Vanadio-oxy-chromium-draviteNa(V)3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O Trig. 3m : R3m
9.CK.05Fluor-uviteCaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
9.CK.05Vanadio-oxy-draviteNaV3(Al4Mg2)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.10Abenakiite-(Ce)Na26Ce6(Si6O18)(PO4)6(CO3)6(SO2)OTrig. 3 : R3
9.CK.20Steenstrupine-(Ce)Na14Mn2+2Fe3+2Ce6Zr(Si6O18)2(PO4)6(PO3OH)(OH)2 · 2H2OTrig.
9.CK.20Thorosteenstrupine(Ca,Th,Mn)3Si4O11F · 6H2O

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

17.4.5FukaliteCa4[Si2O6][CO3](OH)2Mon. 2/m : P21/b
17.4.6MeioniteCa4Al6Si6O24CO3Tet. 4/m : I4/m
17.4.7Cancrinite(Na,Ca,◻)8(Al6Si6O24)(CO3,SO4)2 · 2H2OHex. 6 : P63
17.4.8CarletoniteKNa4Ca4Si8O18(CO3)4(OH,F) · H2OTet. 4/mmm (4/m 2/m 2/m) : P4/mbm
17.4.10Kainosite-(Y)Ca2(Y,Ce)2(Si4O12)(CO3) · H2OOrth. mmm (2/m 2/m 2/m)
17.4.11Caysichite-(Y)Ca2Y2Si4O10(CO3)3 · 4H2OOrth. mm2
17.4.12Lepersonnite-(Gd)Ca(Gd,Dy)2(UO2)24(SiO4)4(CO3)8(OH)24 · 48H2OOrth.
17.4.13AshburtonitePb4Cu4(Si4O12)(HCO3)4(OH)3Cl · H2OTet.
17.4.15Tundrite-(Ce)Na2Ce2Ti(SiO4)(CO3)2O2Tric. 1 : P1

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 ScawtiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Tilley, C.E. and Hey, M.H. (1930) Scawtite, a new mineral from Scawt Hill, Co. Antrim. Mineralogical Magazine: 22: 222-224.
Foshag, W.F. (1935) New mineral names. American Mineralogist: 20: 403-404.
Murdoch, J. (1955) Scawtite from Crestmore, California. American Mineralogist: 40: 505-509.
McConnell, J.D.C. (1955) A chemical, optical, and X-ray study of scawtite from Ballycraigy, Larne, N. Ireland. American Mineralogist: 40: 510-514.
Murdoch, J. and McConnell, D. (1958) The crystal chemistry of scawtite. American Mineralogist: 43: 498-502.
Harker, R.I. (1965) Scawtite and its synthesis. Mineralogical Magazine: 34(268): 232-236.
Pluth, J.J. and Smith, J.V. (1973) The crystal structure of scawtite, Ca7(Si6O8)(CO3)·2H2O. Acta Crystallographica: B29: 73-80.
Zhang, L., Fu, P., Yang, H., Yu, K., and Zhou, Z. (1992) Crystal structure of scawtite. Chinese Sci. Bulletin: 37: 930-934.
Jambor, J.L. and Grew, E.S. (1974) New mineral names. American Mineralogist: 79: 387-391.
Grice, J.D. (2005) The structure of spurrite, tilleyite and scawtite, and relationships to other silicate-carbonate minerals. Canadian Mineralogist: 43: 1489-1500.

Internet Links for ScawtiteHide

Localities for ScawtiteHide

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.
  • Tasmania
    • Huon Valley municipality
      • Huon-Channel region
        • Weld river district
Bottrill, R.S., Baker, W.E. (2008) A Catalogue of the Minerals of Tasmania. Geological Survey Tasmania Bulletin 73, 254 pages.
  • Anhui
    • Huaibei
      • Suixi Co.
Liming Zhang, Pingqiu Fu, and Hexiong Yang (1991): Acta Mineralogica Sinica 11(3), 209-213
  • Hebei
    • Handan
      • She County
Cao Zhengmin, Bi Yurun, and Wang Peiying (1987): Acta Petrologica et Mineralogica 6(2), 158-163
  • Cienfuegos Province
Chukanov, N. V. (2013). Infrared spectra of mineral species: extended library. Springer Science & Business Media.
  • Bavaria
    • Lower Franconia
      • Haßberge District
        • Maroldsweisach
J. Tron (1987): Scawtit von Maroldsweisach. LAPIS 12 (2), 30
  • Veszprém County
    • Sümeg district
      • Sümegprága
Newman, Peter V. (1973) Scawtite from Java. Mineralogical Record, 4, 205.
  • Connacht
    • Sligo County
      • Killala Bay
Bull. Soc. Franç. Minéralo. Cristallo. , 1974, 97, p. 506.
  • Veneto
    • Vicenza Province
      • Altissimo
        • Del Tesoro Mountain
Boscardin M.,Daleffe A.,Rocchetti I., Zordan A. (2011) " Minerali del Vicentino - Aggiornamenti, località e nuove determinazioni " Museo di Archeologia e Scienze Naturali “G. Zannato” – Montecchio Maggiore (Vicenza), pp.183
      • Cornedo Vicentino
        • Spagnago
Boscardin, M., Cassinelli, C. and Sovilla, S. (1990): Die Mineralien des Basaltes von Spagnago im norditalienischen Vicentin. Lapis 15(12), 27-32; 50; Boscardin M.,Daleffe A.,Rocchetti I., Zordan A. (2011) " Minerali del Vicentino - Aggiornamenti, località e nuove determinazioni " Museo di Archeologia e Scienze Naturali “G. Zannato” – Montecchio Maggiore (Vicenza), pp.183
      • Rotzo
Collections Alessandro Mattiello and Padua University; Zordan, A. (2014) Provincia di Vicenza. In: Zorzi, F., and Boscardin, M. (eds.), Minerali del Veneto. Alla scoperta dei tesori della nostra regione. Museo di Storia Naturale e Archeologia di Montebelluna - Treviso, Cierre Edizioni, Sommacampagna, 173-246.
      • Schio
        • Tretto
          • Val Munari
            • Contrade Maglio-Pornaro
Mattioli, V., Boscardin, M., Rocchetti, I., Zorzi, F. (2014): Scawtite nel giacimento di contatto di Val Munari, Torrente Acquasaliente, Contrade Maglio e Pornaro, Schio (Vicenza). GMT 2014 Giornate Mineralogiche di Tavagnasco, 6-8 giugno 2014. Plinius, 40, 152.
  • Fukushima Prefecture
Matsuyama, F. (2001)
  • Hiroshima Prefecture
    • Shoubara City
Kusachi et al (1971) Koubutsugaku Zasshi, 10, 296-304.; Kusachi, I., Numano, T., & Henmi, K. (1971). Contact minerals from Kushiro, Hiroshima Prefecture; 3, Foshagite, Hillebrandite and Scawtite. Journal of the Mineralogical Society of Japan, 10, 296-304.
Yamada, S. (2004) Nihonsan-koubutsu Gojuon-hairetsu Sanchi-ichiranhyou (111 pp.)
  • Okayama Prefecture
    • Takahashi City
      • Bicchu-cho (Bitchu-cho)
        • Fuka
Mineralogical Journal Vol. 14 (1989) , No. 7 pp 299-302; Henmi, C., & Kusachi, I. (1992). Clinotobermorite, Ca5Si6 (O, OH) 18· 5H2O, a new mineral from Fuka, Okayama Prefecture, Japan. Mineralogical Magazine, 56(3), 353-358.; KUSACHI, I., & HENMI, C. (1991). Sillenite from Fuka, Okayama prefecture, Japan. Mineralogical Journal, 15(8), 343-348.
New Zealand
  • Northland Region
    • Kaipara District
Mason, B. (1957) Larnite, scawtite, and hydrogrossular from Tokatoka, New Zealand. American Mineralogist 42, 379-392.; Harker, R.I. (1965) Scawtite and its synthesis. Mineralogical Magazine, vol. 34, n° 268, 232-236 (referring to Mason, 1957).
Baker, C.K., Black, P.M. (1980) Assimilation and metamorphism at a basalt limestone contact, Tokatoka, New Zealand. Mineralogical Magazine, Vol. 43:330, 797-807.
  • Vestfold og Telemark
    • Skien
Jamtveit B., Dahlgren S. and Austrheim H. (1997): High-grade contact metamorphism of calcareous rocks from the Oslo Rift, Southern Norway. American Mineralogist. 82 : 1241 - 1254
  • Lower Silesian Voivodeship
    • Kłodzko County
      • Gmina Nowa Ruda
        • Przygórze
          • Bolesław Mine
Łukasz Kruszewski PXRD data
  • Hunedoara
    • Hunedoara
Marincea, Ş., Bilal, E., Verkaeren, J., Pascal, M.-L., and Fonteilles, M. (2001) Superposed paragenesis in spurrite-, tilleyite- and gehlenite-bearing skarns from Cornet Hill, Apuseni Mountains, Romania. Canadian Mineralogist: 39: 1435-1453.; Marincea, Ş., Dumitraş, D. G., Călin, N., Anason, A. M., Fransolet, A. M., & Hatert, F. (2013). Spurrite, tilleyite and associated minerals in the exoskarn zone from Cornet Hill (Metaliferi Massif, Apuseni Mountains, Romania). The Canadian Mineralogist, 51(3), 359-375.
  • Northern Ireland
    • Co. Antrim
      • Glenoe
Henmi, C., Kusachi, I., Henmi, K., Sabine, P.A., and Young, B.R. (1973) A new mineral bicchulite, the natural analogue of gehlenite hydrate, from Fuka, Okayama Prefecture, Japan and Carneal, County Antrim, Northern Ireland, Mineralogical Journal, 7, 243-251.
      • Larne
McConnell, J.D.C. (1954) The hydrated calcium silicates riversideite, tobermorite and plombierite. Mineralogical Magazine, 30, 293-305.; McConnell, J.D.C. (1955) A Chemical, Optical and X-ray Study of Scawtite from Ballycraigy, Larne, N. Ireland. American Mineralogist, 40(5-6), 510-514.; Murdoch, Joseph (1955) Scawtite from Crestmore, California. American Mineralogist: 40: 505-509 (referring to McConnell, 1954).; Harker, R.I. (1965) Scawtite and its synthesis. Mineralogical Magazine, vol. 34, n° 268, 232-236 (referring to McConnell, 1954).
Tilley, C.E., Hey, M.H. (1930) Scawtite, a new mineral from Scawt Hill, Co. Antrim. Mineralogical Magazine: 22(128): 222-224.; Murdoch, J. (1955) Scawtite from Crestmore, California. American Mineralogist: 40: 505-509 (referring to scawtite from the type locality (Tilley and Hey, 1930)).; Harker, R.I. (1965) Scawtite and its synthesis. Mineralogical Magazine: 34(268): 232-236.
  • Scotland
    • Highland
      • Fort William and Ardnamurchan
        • Ardnamurchan
Agrell, S.O. (1965) Polythermal metamorphism of limestones at Kilchoan, Ardnamurchan. Mineralogical Magazine: 34: 1-15.
  • Arizona
    • Gila Co.
      • Banner Mining District
        • Christmas
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 362.
  • California
    • Riverside Co.
      • Crestmore
American Mineralogist: 51: 56-74
          • Sky Blue Hill
Murdoch, Joseph (1954) Scawtite and bultfonteinite from Crestmore, California. (abstract): Geological Society of America Bulletin: 65: 1347-1348.; Murdoch, Joseph (1955) Scawtite from Crestmore, California. American Mineralogist: 40: 505-509.; Harker, R.I. (1965) Scawtite and its synthesis. Mineralogical Magazine, vol. 34, n° 268, 232-236 (referring to Murdoch, 1955).; Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Press: 478.
  • Montana
    • Cascade Co.
      • Neihart Mining District (Montana Mining District)
Taylor, J.H. (1935) A contact metamorphic zone from the Little Belt Mountains, Montana. American Mineralogist, 20, 120-128.; Murdoch, Joseph (1955) Scawtite from Crestmore, California. American Mineralogist: 40: 505-509 (referring to Taylor, 1935).; Gobla, M.J. (2012) Montana mineral locality index. Rocks & Minerals, 87, #3, 208-240.
Mineral and/or Locality  
Mindat Discussions Facebook Logo Instagram Logo Discord Logo is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Public Relations by Blytheweigh.
Copyright © and the Hudson Institute of Mineralogy 1993-2021, except where stated. Most political location boundaries are © OpenStreetMap contributors. relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us - Report a bug/vulnerability Current server date and time: April 16, 2021 17:01:19 Page generated: April 8, 2021 16:50:49
Go to top of page