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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.

Hide all sections | Show all sections

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:

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)

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:
Plombièrite4 photos of Scawtite associated with Plombièrite on
Tobermorite3 photos of Scawtite associated with Tobermorite on
Xonotlite3 photos of Scawtite associated with Xonotlite on
Thaumasite2 photos of Scawtite associated with Thaumasite on
Stringhamite1 photo of Scawtite associated with Stringhamite on
Jennite1 photo of Scawtite associated with Jennite on

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.05Fluor-buergeriteNa(Fe3+3)Al6(Si6O18)(BO3)3O3FTrig. 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.05SchorlNa(Fe2+3)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.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.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.05Fluor-uviteCa(Mg3)MgAl5(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
9.CK.10Abenakiite-(Ce)Na26Ce6(Si6O18)(PO4)6(CO3)6(SO2)OTrig. 3 : R3
9.CK.20Steenstrupine-(Ce)Na14Mn2+2(Fe3+,Mn3+)2Ce6(Zr,Th)(Si6O18)2(PO4)6(HPO4)(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 · 48H2O
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., 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., 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., 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., Zhou, Z. (1992) Crystal structure of scawtite. Chinese Sci. Bulletin: 37: 930-934.
Jambor, J.L., 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 & Baker (in prep) Catalogue of minerals of Tasmania
  • Anhui Province
    • Huaibei Prefecture
      • Suixi Co.
Liming Zhang, Pingqiu Fu, and Hexiong Yang (1991): Acta Mineralogica Sinica 11(3), 209-213
  • Hebei Province
    • Handan Prefecture
      • She Co.
Cao Zhengmin, Bi Yurun, and Wang Peiying (1987): Acta Petrologica et Mineralogica 6(2), 158-163
  • Bavaria
    • Franconia
      • Maroldsweisach
J. Tron (1987): Scawtit von Maroldsweisach. LAPIS 12 (2), 30
  • Veszprém Co.
    • Balaton Uplands
      • Bakony Mts
        • Sümegprága
  • Java (Jawa)
    • Java Sea
Newman, Peter V. (1973) Scawtite from Java. Mineralogical Record, 4, 205.
  • Co. Sligo
    • Killala Bay
Bull. Soc. Franç. Minéralo. Cristallo. , 1974, 97, p. 506.
  • Veneto
    • Vicenza Province
      • Altissimo
        • Del Tesoro Mt.
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
      • Astico Valley
Collections Alessandro Mattiello and Padua University
      • Cornedo Vicentino
        • Spagnago
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; 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
      • 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.
  • Honshu Island
    • Chugoku Region
      • Hiroshima prefecture
        • Hiba-gun
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.
    • Tohoku Region
      • Fukushima Prefecture
Matsuyama, F. (2001)
New Zealand
  • North Island
    • Northland Region
      • Kaipara
Mason, B. (1957): Larnite, scawtite, and hydrogrossular from Tokatoka, New Zealand. American Mineralogist 42, 379-392.
  • 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
  • Hunedoara Co.
    • 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. (1955). A Chemical, Optical and X-ray Study of Scawtite from Ballycraigy, Larne, N Ireland. American Mineralogist, 40(5-6), 510-514.
Mineralogical Magazine 1930 22 : 222-224
  • Scotland
    • North West Highlands
      • Ardnamurchan
Mineralogical Magazine 1965 34 : 1-15.
  • Arizona
    • Gila Co.
      • Dripping Spring Mts
        • Banner District
          • Christmas area
            • 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 (1954b), Scawtite and bultfonteinite from Crestmore, California: (abstract): Geological Society of America Bulletin: 65: 1347-1348; Murdoch, Joseph (1955a), Scawtite from Crestmore, California: American Mineralogist: 40: 505-509; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 478.
  • Montana
    • Cascade Co.
      • Neihart District (Montana District)
Gobla, M.J. (2012) Montana mineral locality index. Rocks & Minerals, 87, #3, 208-240.
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