Mineralogy Database

Larnite Mineral Data

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General Larnite Information

Help on Chemical  Formula: Chemical Formula: Ca2SiO4
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Ca2(SiO4)
Help on Environment: Environment: Contact metamorphism of limestones.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1929
Help on Locality: Locality: Scawt Hill, near Larne, Co., Antrim, Ireland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its locality.
Help on Name Pronunciation: Name Pronunciation: Larnite Say LARNITE
Help on Synonym: Synonym: ICSD 39006
  PDF 33-302
 

Larnite Image

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  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

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  Paraspurrite   Larnite

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

Help on Axial Ratios: Axial Ratios: a:b:c =0.8106:1:1.3727
Help on Cell Dimensions: Cell Dimensions: a = 5.48, b = 6.76, c = 9.28, Z = 4; beta = 94.55° V = 342.69 Den(Calc)= 3.34
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/n
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.795(1), 2.744(0.95), 2.78(0.9),
 

Physical Properties of Larnite

Help on Cleavage: Cleavage: {100} Good
Help on Color: Color: Colorless, Gray.
Help on Density: Density: 3.28
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Larnite

Help on Gladstone-Dale: 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
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.34 gm/cc
note: Specific Gravity of Larnite =3.34 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0084215622
Boson Index = 0.9915784378
Help on Photoelectric: Photoelectric: PELarnite = 6.32 barns/electron
U=PELarnite x rElectron Density= 21.09 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Larnite is Not Radioactive
 

Larnite Classification

Help on  Dana Class: 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
Help on  Strunz Class: 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

Help on References: References: NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)
Help on See Also: 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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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:

 

 
   
 


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