Larnite Mineral Data

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General Larnite Information

Chemical Formula:

Ca2SiO4

Composition:

Molecular Weight = 172.24 gm

Calcium 46.54 % Ca 65.12 % CaO

Silicon 16.31 % Si 34.88 % SiO₂

Oxygen 37.16 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₂(SiO₄)

Environment:

Contact metamorphism of limestones.

IMA Status:

Valid Species (Pre-IMA) 1929

Locality:

Scawt Hill, near Larne, Co., Antrim, Ireland. Link to MinDat.org Location Data.

Name Origin:

Named after its locality.

Name Pronunciation:

Larnite

Synonym:

ICSD 39006

PDF 33-302

Larnite Image

Images:

Larnite

Comments: Gray larnite masses in rock.
Location: Scawt Hills, Larne, County Antrim, Northern Ireland. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Larnite Paraspurrite

Comments: Violet-tinted gray crystalline pure paraspurrite mass with larnite veinlets.
Location: Near Darwin, Inyo County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Larnite Crystallography

Axial Ratios:

a:b:c =0.8106:1:1.3727

Cell Dimensions:

a = 5.48, b = 6.76, c = 9.28, Z = 4; beta = 94.55° V = 342.69 Den(Calc)= 3.34

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/n

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.795(1), 2.744(0.95), 2.78(0.9),

Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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S - Stereo Pair on/off
H - Help Screen
I - Data Info
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Tsurumi T , Hirano Y , Kato H , Kamiya T , Daimon M , Ceramic Transactions , 40 (1994) p.19-25, Crystal structure and hydration of belite, Locality: synthetic

Physical Properties of Larnite

Cleavage:

{100} Good

Color:

Colorless, Gray.

Density:

3.28

Diaphaneity:

Transparent to translucent

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

6 - Orthoclase

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Larnite

Gladstone-Dale:

CI meas= -0.045 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.026 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2148,KPDmeas= 0.2187,KC= 0.2093
Ncalc = 1.69 - 1.7

Optical Data:

Biaxial (+), a=1.707, b=1.715, g=1.73, bire=0.0230, 2V(Calc)=74, 2V(Meas)=large.

Calculated Properties of Larnite

Electron Density:

Bulk Density (Electron Density)=3.34 gm/cc
note: Specific Gravity of Larnite =3.34 gm/cc.

Fermion Index:

Fermion Index = 0.0084215622
Boson Index = 0.9915784378

Photoelectric:

PE_Larnite= 6.32 barns/electron
U=PE_Larnite x rElectron Density= 21.09 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Larnite is Not Radioactive

Larnite Classification

Dana Class:

51.05.01.01 (51)Nesosilicate Insular SiO4 Groups Only

(51.05)with cations in >[6] coordination

(51.05.01)Dana Group

51.05.01.01 Larnite Ca2SiO4 P 2₁/n 2/m

Strunz Class:

09.AD.05 09 - SILICATES (Germanates)

09.A - Nesosilicates

09.AD -Nesosilicates without additional anions;

09.AD.05 Larnite Ca2SiO4 P 2₁/n 2/m

Other Larnite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)

See Also:

Links to other databases for Larnite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Ask about Larnite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
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Rockhounds Discussion Group on Yahoo Groups
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Print or Cut-and-Paste your Larnite Specimen Label here :

Larnite

Ca2SiO4
Dana No: 51.05.01.01 Strunz No: 09.AD.05
Locality:

Notes: