Mineralogy Database

Foshallasite Mineral Data

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General Foshallasite Information

Help on Chemical  Formula: Chemical Formula: Ca3Si2O7•3(H2O)
Help on Composition: Composition: Molecular Weight = 342.45 gm
   Calcium   35.11 %  Ca   49.13 % CaO
   Silicon   16.40 %  Si   35.09 % SiO2
   Hydrogen   1.77 %  H    15.78 % H2O
   Oxygen    46.72 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca3Si2O7•3(H2O)
Help on Environment: Environment: Alkaline nepheline syenites. Foshallasite (1936) is now considered zeophyllite (1902).
Help on IMA Status: IMA Status: Discredited IMA 2006 - Valid Species (Pre-IMA) 1936
Help on Locality: Locality: Mt. Yukspor, Khibiny massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Willian Frederick Foshag (1984-1956), American mineralogist, and for the mineral centrallasite (now named gyrolite).
Help on Name Pronunciation: Name Pronunciation: Foshallasite + Pronunciation Say FOSHALLASITE
Help on Synonym: Synonym: Discredited - Foshallasite (1936) is now considered zeophyllite (1902).

Foshallasite Image

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Comments: Pearly translucent white somewhat fibrous aggregate of foshallasite.
Location: Mount Yukspor, Khibiny Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Foshallasite Crystallography

Help on Crystal System: Crystal System: Monoclinic

Physical Properties of Foshallasite

Help on Cleavage: Cleavage: {100} Perfect
Help on Color: Color: Snow white.
Help on Density: Density: 2.5
Help on Hardness: Hardness: 2.5-3 - Finger Nail-Calcite
Help on Streak: Streak: white

Optical Properties of Foshallasite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.057 (Good) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.2168,KC= 0.2298
Ncalc = 1.57
Help on Optical Data: Optical Data: Biaxial (-), a=1.535, b=1.542, g=1.549, bire=0.0140, 2V(Calc)=88, 2V(Meas)=12-18.

Calculated Properties of Foshallasite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.54 gm/cc
note: Specific Gravity of Foshallasite =2.50 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0083610278
Boson Index = 0.9916389722
Help on Photoelectric: Photoelectric: PEFoshallasite = 4.90 barns/electron
U=PEFoshallasite x rElectron Density= 12.46 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Foshallasite is Not Radioactive

Foshallasite 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.HA.55 09 - SILICATES (Germanates)
  09.H - Unclassified Silicates
  09.HA -With alkali and alkali-earth Elements
09.HA.55 Foshallasite? Ca3Si2O7•3(H2O) Mono

Other Foshallasite Information

Help on References: References: NAME( Dana8) 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 Foshallasite :
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 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Dana No: Strunz No: 09.HA.55





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