Mineralogy Database

Killalaite Mineral Data

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General Killalaite Information

Help on Chemical  Formula: Chemical Formula: 2Ca3Si2O7•(H2O)
Help on Composition: Composition: Molecular Weight = 594.82 gm
   Calcium   40.43 %  Ca   56.57 % CaO
   Silicon   18.89 %  Si   40.41 % SiO2
   Hydrogen   0.34 %  H     3.03 % H2O
   Oxygen    40.35 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca6Si4O14•(H2O)
Help on Environment: Environment: A secondary mineral in cavities and veins in hydrothermally altered and thermally metamorphosed limestones.
Help on IMA Status: IMA Status: Approved IMA 1974
Help on Locality: Locality: From near Inishcrone, along the east shore of Killala Bay, Co. Sligo, and at Carneal, Co. Antrim, Ireland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality
Help on Name Pronunciation: Name Pronunciation: Killalaite + Pronunciation Say KILLALAITE
Help on Synonym: Synonym: ICSD 200124
  PDF 29-332

Killalaite Image

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Comments: B&W PPL image of killalaite crystals in a vein of calcite. MinMag v39:544.
Location: Thermally metamorphosed limestone near Inishcrone, along the eastern shore of Killala Bay, Co. Sligo, Ireland. Scale: Crystal Size 0.5 mm.
© Mineralogical Magazine

Killalaite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4403:1:0.4405
Help on Cell Dimensions: Cell Dimensions: a = 6.807, b = 15.459, c = 6.811, Z = 2; beta = 97.76° V = 710.15 Den(Calc)= 2.78
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.824(1), 3.03(0.8), 2.724(0.6),

Physical Properties of Killalaite

Help on Cleavage: Cleavage: {100} Perfect, {010} Good, {001} Good
Help on Color: Color: Colorless, White.
Help on Density: Density: 2.94
Help on Streak: Streak: white

Optical Properties of Killalaite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.019 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.078 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2297,KPDmeas= 0.2172,KC= 0.2131
Ncalc = 1.59 - 1.63
Help on Optical Data: Optical Data: Biaxial (-), a=1.635, g=1.642, bire=0.0070, 2V(Meas)=26.

Calculated Properties of Killalaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.95 gm/cc
note: Specific Gravity of Killalaite =2.94 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0095600872
Boson Index = 0.9904399128
Help on Photoelectric: Photoelectric: PEKillalaite = 5.67 barns/electron
U=PEKillalaite x rElectron Density= 16.69 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Killalaite is Not Radioactive

Killalaite Classification

Help on  Dana Class: Dana Class: (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O
  (56.02)with cations in [4] and/or >[4] coordination
  (56.02.09)Tilleyite - Killalaite group Tilleyite Ca5Si2O7(CO3)2 P 21/a 2/m Killalaite 2Ca3Si2O7•(H2O) P 21/m 2/m Foshallasite? Ca3Si2O7•3(H2O) Mono
Help on  Strunz Class: Strunz Class: 09.BE.85 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BE -Si2O7 groups with additional anions;
09.BE.85 Killalaite 2Ca3Si2O7•(H2O) P 21/m 2/m

Other Killalaite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Killalaite :
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

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Dana No: Strunz No: 09.BE.85





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