Help|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on MindatThe Mindat Store
Minerals by PropertiesMinerals by ChemistryRandom MineralSearch by minIDLocalities Near MeSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportAdd Glossary Item
StatisticsMember ListBooks & MagazinesMineral Shows & EventsThe Mindat DirectoryHow to Link to MindatDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery


This page is currently not sponsored. Click here to sponsor this page.
After the type locality, Scawt Hill, Larne, Co. Antrim, Northern Ireland, UK.
Dimorph of:
Olivine Group. The high-temperature, monoclinic polymorph of Calcio-Olivine.

Larnite crystallizes at high temperatures. It occurs in limestones or chalk zones in contact with molten basaltic rocks. Larnite is stable in the range of 520° to 670° C; otherwise, it is only metastable at lower temperatures and inverts to its low-temperature polymorph, Calcio-Olivine, when shocked.

An important phase (Belite, β-C2S) in cement clinker.
Five polymorphs of Ca2SiO4 are known; some are stabilised by impurities.

Classification of Larnite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"

9 : SILICATES (Germanates)
A : Nesosilicates
D : Nesosilicates without additional anions; cations in [6] and/or greater coordination

51 : NESOSILICATES Insular SiO4 Groups Only
5 : Insular SiO4 Groups Only with cations in >[6] coordination

14 : Silicates not Containing Aluminum
5 : Silicates of Ca URL:
Please feel free to link to this page.

Type Occurrence of Larnite

Year of Discovery:

Occurrences of Larnite

Geological Setting:
Metamorphosed sedimentary carbonate formations in contact with basaltic rocks.

Physical Properties of Larnite

Hardness (Mohs):

Crystallography of Larnite

Crystal System:
Cell Parameters:
a = 5.5Å, b = 6.74Å, c = 9.29Å
β = 94.59°
a:b:c = 0.816 : 1 : 1.378
Unit Cell Volume:
V 343.28 ų (Calculated from Unit Cell)

Optical Data of Larnite

Biaxial (+)
RI values:
nα = 1.707 nβ = 1.715 nγ = 1.730
Calculated: 74°
Max Birefringence:
δ = 0.023
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
r > v

Chemical Properties of Larnite

Essential elements:
All elements listed in formula:
Common Impurities:

Relationship of Larnite to other Species

14.5.11AfwilliteCa3(HSiO4)2 · 2H2O
14.5.16SuoluniteCa2(H2Si2O7) · H2O
14.5.18OkeniteCa10Si18O46 · 18H2O
14.5.19RiversideiteCa5(HSi3O9)2 · 2H2O
14.5.21GyroliteNaCa16Si23AlO60(OH)8 · 14H2O
14.5.22FoshallasiteCa3[Si2O7] · 3H2O(?)
14.5.23Tobermorite[Ca4Si6O17 · 2H2O]·(Ca·3H2O)
14.5.24Clinotobermorite[Ca4Si6O17 · 2H2O]·(Ca·3H2O)
14.5.26Plombièrite[Ca4Si6O16(OH)2 · 2H2O]·(Ca·5H2O)
14.5.27JenniteCa9(Si3O9)2(OH)8 · 8H2O

Other Names for Larnite

Name in Other Languages:
Simplified Chinese:斜硅钙石
Traditional Chinese:斜矽鈣石

Other Information

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 Larnite

Reference List:
Tilley, C.E. (1929) On larnite (calcium orthosilicate, a new mineral) and its associated minerals from the limestone contact-zone of Scawt Hill, Co. Antrim. Mineralogical Magazine, 22, 77-86.

American Mineralogist (1929): 14: 338.

American Mineralogist (1966): 51: 1766.

Jost, K.H., B. Ziemer, and R. Seydel (1977) Redetermination of the structure of dicalcium silicate. Acta Crystallographica: B33: 1696-1700.

Deer, W.A., R.A. Howie, and J. Zussman (1986) Rock-forming minerals, (2nd edition), v. 1B, disilicates and ring silicates, 248-255.

Martínez-Frías, J., Benito, R., Wilson, G., Delgado, A., Boyd, T., and Marti, K. (2004): Analysis and chemical composition of larnite-rich ultrarefractory materials. Journal of Materials Processing Technology 147, 204–210.

Internet Links for Larnite

The following Larnite specimens are currently listed for sale on

Localities for Larnite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
  • Styria
    • Bad Radkersburg
      • Klöch
R. Exel: Die Mineralien und Erzlagerstätten Österreichs (1993)
  • Nunavut Territory
    • Bathurst Island
Mitchell, R.H., and Platt, R.G. (1984): Canadian Journal of Earth Sciences 21(4), 428–436.
Central African Republic
  • Lobaye Prefecture
    • Lobaye River (Bali River)
Nazarov, M.A., Kurat, G., and Brandstätter, F. (1998): Proceedings of the 61st Annual Meteoritical Society Meeting, Dublin (Ireland), July 27-31, 1998, Abstract 5123.
  • Rhineland-Palatinate
    • Eifel
      • Daun
        • Üdersdorf
Schüller, W., Betz, V., Die Mineralien vom Emmelberg, Lapis 12/1986
      • Mayen
        • Ettringen
          • Bellerberg volcano
Hentschel, G. (1987): Die Mineralien der Eifelvulkane, Weise (München), 2. Auflage
            • Southern lava flow
Hentschel, G. (1961): Seltene Mineralneubildungen in einem Kalksteineinschluß der Lava des Ettringer Bellerberges, Fortschritte Mineralogie, Vol. 39, 345
  • Tunu Province (East Greenland)
    • Kangerlussuaq Firth
      • Kangerlussuaq complex
Nielsen, T.F.D., Solovova, I.P. Veksler, I.V. (1997): Contributions to Mineralogy and Petrology 126–124, 331–344.
  • Negev
Sharygin, V.V., Sokol, E.V. & Vapnik, Ye. (2008): Minerals of the pseudobinary perovskite-brownmillerite series from combustion metamorphic larnite rocks of the Hatrurim Formation (Israel). Russian Geology and Geophysics 49, 709-726.
Gross, S. (1977): The Mineralogy of the Hatrurim Formation, Israel. Geological Survey of Israel, Bulletin no. 70, 80 pp.
Sokol, E.V., Seryotkin, Y.V., Kokh, S.N., Vapnik, Ye., Nigmatulina, E.N., Goryainov, S.V., Belogub, E.V., Sharygin, V.V. (2015): Flamite, (Ca,Na,K)2(Si,P)O4, a new mineral from ultrahigh-temperature combustion metamorphic rocks, Hatrurim Basin, Negev Desert, Israel. Mineralogical Magazine, 79, 583-596.
  • Southern District (HaDarom District)
Gross S (1984) Occurrence of ye'elimite and ellestadite in an unusual cobble from the "pseudo-conglomerate" of the Hatrurim basin, Israel. Geological Survey of Israel Current Research, 1-4
  • Latium
    • Rome Province
Federico, M., Peccerillo, A., (2002): Mineral chemistry and petrogenesis of granular ejecta from the Alban Hills volcano, Mineralogy and Petrology, Vol 74, 223-252
  • Karagandy Province (Qaragandy Oblysy; Karaganda Oblast')
    • Atasu
Krigman, L.D., Veksler, I.V., Ishbulatov, R.A., and Nielsen, T.F.D. (2001) in: Proceedings of the EUG XI, Strasbourg, France, 8–12 April, European Union of Geosciences, J. Conf. (Abstracts) 6, 578.
New Zealand
  • North Island
    • Northland
      • Kaipara
Mason, B. (1957): Larnite, scawtite, and hydrogrossular from Tokatoka, New Zealand. American Mineralogist 42, 379-392.
  • West Bank
    • Hatrurim Formation
Galuskin, E., Galuskina, I., Kusz, J., Armbruster, T., Marzec, K., Dzierżanowski, P., Murashko, M. (2014): Vapnikite Ca3UO6 - a new double perovskite mineral from pyrometamorphic larnite rocks of the Jabel Harmun, Palestine Autonomy, Israel. Mineralogical Magazine, 78, 571-581
Seryotkin Y.V., Sokol E.V. & Kokh S.N. 2012: Natural pseudowollastonite: Crystal structure, associated minerals, and geological context. Lithos, vol. 134-135, pp. 75-90; Seryotkin, Yu.V., Sokol, E.V., Kokh, S.N. (2012): Natural pseudowollastonite: Crystal structure, associated minerals, and geological context. Lithos, 134–135, 75-90.
  • Brașov Co.
    • Racoş Commune
Szakáll, S., Kristály, F., 2010. Mineralogy of Székelyland, Eastern Transylvania, Romania. Sfântu Gheorghe-Miercurea Ciuc-Târgu Mureş. 2010.
  • Harghita Co.
    • Odorheiu Secuiesc (Székelyudvarhely; Oderhellen)
      • Racoş (Racoşu de Jos)
Szakáll, S. & Kristály, F., Eds. (2010): Mineralogy of Székelyland, Eastern Transylvania, Romania. Csík County Nature and Conservation Society, Miercurea-Ciuc, Romania, 321 pp.
  • Eastern-Siberian Region
    • Krasnoyarsk Territory (Krasnoyarsk Kray; Krasnoyarskii Krai)
      • Maimecha and Kotui Rivers Basin
Henderson, C. M. B., Kogarko, L. N., & Plant, D. A. (1999). Extreme closed system fractionation of volatile-rich, ultrabasic peralkaline melt inclusions and the occurrence of djerfisherite in the Kugda alkaline complex, Siberia. Mineralogical Magazine, 63(3), 433-438.
    • Prebaikalia (Pribaikal'e)
      • Irkutskaya Oblast'
        • Narin-Kunta
Armbruster, T., Lazic, B., Gfeller, F., Galuskin, E.V., Galuskina, I.O., Savelyeva, V.B., Zadov, A.E., Pertsev, N.N., Dzierżanowski, P. (2011): Chlorine content and crystal chemistry of dellaite from the Birkhin gabbro massif, Eastern Siberia, Russia. Mineralogical Magazine, 75, 379-394.
  • Northern Caucasus Region
    • Kabardino-Balkarian Republic
      • Baksan Valley
Galuskin, E.V., Galuskina, I.O., Kusz, J., Gfeller, F., Armbruster, T., Bailau, R., Dulski, M., Gazeev, V.M., Pertsev, N.N., Zadov, A.E., Dzieržanowski, P. (2015): Mayenite supergroup, part II: Chlorkyuygenite from Upper Chegem, northern Caucasus Kabardino-Balkaria, Russia, a new microporous mayenite supergroup mineral with “zeolitic” H2O. European Journal of Mineralogy. 27, 113-122
      • Verkhnechegemskaya caldera (Verkhni Chegem caldera; Upper Chegem caldera)
Galuskina, I.O., Galuskin, E.V., Dzierzanowski, P., Gazeev, V.M., Prusik, K., Pertsev, N.N., Winiarski, A., Zadov, A.E., and Wrzalik, R. (2010): American Mineralogist 95(8-9), 1305-1311.; American Mineralogist, Volume 94, pages 1361–1370, 2009; Galuskina, I. O., Galuskin, E. V., Kusz, J., Dzierżanowski, P., Prusik, K., Gazeev, V. M., ... & Dubrovinsky, L. (2013). Dzhuluite, Ca3SbSnFe3+ 3O12, a new bitikleite-group garnet from the Upper Chegem Caldera, Northern Caucasus, Kabardino-Balkaria, Russia. European Journal of Mineralogy, 25(2), 231-239.
  • Urals Region
    • Southern Urals
      • Chelyabinsk Oblast'
Cesnokov, B., Kotrly, M. and Nisanbajev, T. (1998): Brennende Abraumhalden und Aufschlüsse im Tscheljabinsker Kohlenbecken - eine reiche Mineralienküche. Mineralien-Welt, 9 (3), 54-63 (in German).
Zateeva, S. N., Sokol, E. V., & Sharygin, V. V. (2007). Specificity of pyrometamorphic minerals of the ellestadite group. Geology of Ore Deposits, 49(8), 792-805.
          • Kopeisk
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
  • Arusha Region
Martínez-Frías, J., Benito, R., Wilson, G., Delgado, A., Boyd, T., and Marti, K. (2004): Journal of Materials Processing Technology 147, 204–210.; Henderson, C. M. B., Kogarko, L. N., & Plant, D. A. (1999). Extreme closed system fractionation of volatile-rich, ultrabasic peralkaline melt inclusions and the occurrence of djerfisherite in the Kugda alkaline complex, Siberia. Mineralogical Magazine, 63(3), 433-438.
  • Black Sea Region
    • Trabzon Province
Sebastian Axt; Yücel, C., Temizel, R., Abdioğlu, E., Arslan, M., & Yağcıoğlu, U. C. (2014). Origin of analcimes in the Tertiary volcanic rocks from the Eastern Pontides (NE Turkey): a textural, mineralogical and geochemical approach. Neues Jahrbuch für Mineralogie-Abhandlungen: Journal of Mineralogy and Geochemistry, 191(3), 277-299.
  • Northern Ireland
    • Co. Antrim
      • Glenoe
Nawaz, R. (1977). A second occurrence of killalaite. Mineralogical Magazine, 41, 546-548. ; Henmi C, Kusachi I, Henmi K, Sabine P A, 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; P. A. Sabine, M. T. Styles and B. R. Young (1985) The Nature and Paragenesis of Natural Bredigite and Associated Minerals from Carneal and Scawt Hill, Co. Antrim. Mineralogical Magazine 49:663-670.
      • Larne
Peter G. Embrey (1978) Fourth Supplementary List of British Minerals. Mineralogical Magazine 42:169-177
Tilley, C.E. (1929) On larnite (calcium orthosilicate, a new mineral) and its associated minerals from the limestone contact-zone of Scawt Hill, Co. Antrim. Mineralogical Magazine, 22, 77-86.; American Mineralogist: 33: 786; Mineralogical Magazine 1942 26 : 190-196; Tilley, C. E., & Alderman, A. R. (1934). Progressive metasomatism in the flint nodules of the Scawt Hill contact-zone. Mineral Mag, 23, 513-518.; McConnell, J. D. C. (1955). The hydration of larnite (fi-Ca2SiO~) and bredigite (al-Ca2Si04) and the properties of the resulting gelatinous mineral plombierite.
  • Scotland
    • North West Highlands
      • Ardnamurchan
American Mineralogist 35:1080
Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols; Mineralogical Magazine 1965 34 : 1-15.
      • Isle of Muck
Tilley, C.E. (1947) The gabbro-limestone contact zone of Camas Mor, Muck, Inverness-shire. Comptes Rendus de la Société geologique de Finlande, No. 140, 97–105.
    • Strathclyde
      • Isle of Mull
Mineralogical Magazine 1965 34 : 92-106.
  • California
    • Inyo Co.
      • Darwin Hills
        • Darwin District
          • Darwin
Am Min (1962) 47:1003-1005
  • Connecticut
    • Middlesex Co.
      • Portland
        • Collins Hill
          • Strickland pegmatite (Strickland-Cramer Quarry; Strickland-Cramer Mine; Strickland-Cramer Feldspar-Mica Quarries)
Schooner, Richard. (circa 1985), Untitled manuscript on central Connecticut mineralogy.
  • Texas
    • Brewster Co.
      • Christmas Mts
Rocks & Minerals (1991): 66:3: 196-224.
    • Culberson Co.
      • Apache Peak area
Rocks & Minerals (1991): 66(3): 196-224.; Am Min 51:1766-1774
Mineral and/or Locality is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © and the Hudson Institute of Mineralogy 1993-2015, except where stated. relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: October 7, 2015 09:07:38 Page generated: October 6, 2015 10:48:36