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Larnite information


Larnite
General
CategoryNesosilicates
Formula
(repeating unit)
Ca2SiO4
IMA symbolLrn[1]
Strunz classification9.AD.05
Crystal systemMonoclinic
Crystal classPrismatic (2/m)
(same H-M symbol)
Space groupP21/n
Unit cella = 5.5, b = 6.74
c = 9.29 [Å]; β = 94.59°; Z = 4
Identification
ColorWhite to gray
Crystal habitFlattened anhedral grains; massive
TwinningCommon, polysynthetic parallel to {100}
CleavageGood on {100}, imperfect on {010}
Mohs scale hardness6
LusterVitreous
StreakWhite
DiaphaneityTransparent to translucent
Specific gravity3.28–3.33
Optical propertiesBiaxial (+)
Refractive indexnα = 1.707 nβ = 1.715 nγ = 1.730
Birefringenceδ = 0.023
2V angle74° calculated
Dispersionr > v
References[2]

Larnite is a calcium silicate mineral with the formula Ca2SiO4. It is the calcium member of the olivine group of minerals.

It was first described from an occurrence at Scawt Hill, Larne, Northern Ireland in 1929 by Cecil Edgar Tilley and named for the location.[2] At the type locality it occurs with wollastonite, spurrite, perovskite, merwinite, melilite and gehlenite. It occurs in contact metamorphosed limestones and chalks adjacent to basaltic intrusives.[2]

Dicalcium silicate is chemically β–Ca2SiO4, sometimes represented by the idealized oxide formula 2CaO·SiO2 also noted C2S in the cement chemist notation (CCN). When used in the cement industry, the mineral is usually referred to as belite.

  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ a b c Larnite on Mindat.org

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Larnite

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Larnite is a calcium silicate mineral with the formula Ca2SiO4. It is the calcium member of the olivine group of minerals. It was first described from...

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Calcium silicate

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shortened trade name Cal-Sil or Calsil. It occurs naturally as the mineral larnite. Calcium silicate is a white free-flowing powder. It can be derived from...

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Portlandite

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occurs as an alteration of calc–silicate rocks by contact metamorphism of larnite–spurrite. It occurs as fumarole deposits in the Vesuvius area. In Jebel...

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Brownmillerite

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brownmillerite in the Mayen locality include calcite, ettringite, wollastonite, larnite, mayenite, gehlenite, diopside, pyrrhotite, grossular, spinel, afwillite...

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Magnesium oxide

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Calcium silicate – Chemical compound naturally occurring as the mineral larnite Magnesium sulfide – Inorganic compound generated in the production of metallic...

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Belite

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but is not a recognised mineral name. It occurs naturally as the mineral larnite, the name being derived from Larne, Northern Ireland, the closest town...

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Larne

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which has named one of its schools, Larne Elementary School, after Larne. Larnite – this mineral is named after Larne. List of civil parishes of County Antrim...

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Joint compound

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Calcium silicate – Chemical compound naturally occurring as the mineral larnite "What Is Joint Compound - Drywall Compound Vs Spackle". Plastering Blog...

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Chlormayenite

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altered limestones. It occurs with calcite, ettringite, wollastonite, larnite, brownmillerite, gehlenite, diopside, pyrrhotite, grossular, spinel, afwillite...

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Olivine

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group) – which includes tephroite (Mn2SiO4), monticellite (CaMgSiO4), larnite (Ca2SiO4) and kirschsteinite (CaFeSiO4) (commonly also spelled kirschteinite)...

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Scawt Hill

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eroded to its roots. Minerals that were first discovered at Scawt Hill: Larnite (calcium orthosilicate) a natural form of belite discovered in 1929 and...

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Metamorphic facies

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monticellite + melilite ± calcite, diopside (also tilleyite, spurrite, merwinite, larnite and other rare Ca- or Ca-Mg-silicates). Ecologites and blueschists are...

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List of minerals

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Lansfordite Lanthanite (group of rare earth carbonates) Laplandite-(Ce) Larnite Laumontite Laurionite Laurite Lautenthalite Lautite Lavendulan Lawsonite...

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Southeast Bathurst Fault Zone

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The magmas are chemically bimodal, consisting mainly of nephelinites or larnite-normative nephelinites and basanites along with lesser olivine melilite...

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List of mineral symbols

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Ldb Lopatkaite Lpk Larisaite Ls Leiteite Lt Lindgrenite Lgr Lópezite Lpz Larnite Lrn Lemanskiite Lmk Lindqvistite Lqv Lorándite Lor Larosite Lar Lemmleinite-Ba...

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Ettringite

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intrusive rocks or within xenoliths. It also occurs as weathering crusts on larnite in the Hatrurim Formation of Israel. It occurs associated with portlandite...

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Nabimusaite

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fluorine-analogue of dargaite. Nabimusaite was discovered in nodules composed of larnite and ye'elimite, in a rock formed due to pyrometamorphism. Nabimusaite is...

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Grossite

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Associated minerals in the Hatrurium include brownmillerite, mayenite and larnite. In meteorites it occurs with perovskite, melilite, hibonite, spinel and...

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Bentorite

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chromium present as an environmental pollutant. Brownmillerite Gehlenite Larnite Spurrite Ye'elimite Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols"...

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Scawtite

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Associated minerals include melilite, spurrite, tobermorite, thomsonite, larnite, grossular, bultfonteinite, calcite, analcime, foshagite and hillebrandite...

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Zadovite

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pyrometamorphic Hatrurim Complex. Part I. Nabimusaite, KCa12(SiO4)4(SO4)2O2F, from larnite rocks of Jabel Harmun, Palestinian Autonomy, Israel. Mineralogical Magazine...

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Aradite

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pyrometamorphic Hatrurim Complex. Part I. Nabimusaite, KCa12(SiO4)4(SO4)2O2F, from larnite rocks of Jabel Harmun, Palestinian Autonomy, Israel. Mineralogical Magazine...

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Ballygally

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far distance, on the right, is the small peak of Scawt Hill. Six new minerals were discovered for the first time here, including scawtite and larnite....

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Canadian Arctic Rift System

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agglomeratic vents and small plugs. Most of the suite consists of nephelinite or larnite-normative nephelinites and basanites, with rarer olivine melilite nephelinite...

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Shulamit Gross

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minerals such as spurrite, brownmillerite, gehlenite, tacharanite, and larnite. These rare minerals only form at high temperature, for example in places...

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Cecil Edgar Tilley

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for the Mineralogical Magazine he identified and named the new minerals larnite and scawtite. In 1938 he was elected a Fellow of the Royal Society of London...

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