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Foshallasite Mineral Data
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General Foshallasite Information
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 Chemical Formula: |
Ca3Si2O7•3(H2O) |
| Composition: |
Molecular Weight = 342.45 gm |
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Calcium 35.11 % Ca 49.13 % CaO |
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Silicon 16.40 % Si 35.09 % SiO2 |
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Hydrogen 1.77 % H 15.78 % H2O |
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Oxygen 46.72 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Ca3Si2O7•3(H2O) |
| Environment: |
Alkaline nepheline syenites. Foshallasite (1936) is now considered zeophyllite (1902). |
| IMA Status: |
Discredited IMA 2006 - Valid Species (Pre-IMA) 1936 |
| Locality: |
Mt. Yukspor, Khibiny massif, Kola Peninsula, Russia. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Willian Frederick Foshag (1984-1956), American mineralogist, and for the mineral centrallasite (now named gyrolite). |
| Name Pronunciation: |
Foshallasite + Pronunciation  |
| Synonym: |
Discredited - Foshallasite (1936) is now considered zeophyllite (1902). |
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Foshallasite Image |
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Images:
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Foshallasite Crystallography
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| Crystal System: |
Monoclinic |
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Physical Properties of Foshallasite
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| Cleavage: |
{100} Perfect |
| Color: |
Snow white. |
| Density: |
2.5 |
| Hardness: |
2.5-3 - Finger Nail-Calcite |
| Streak: |
white |
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Optical Properties of Foshallasite
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| Gladstone-Dale: |
CI meas= 0.057 (Good) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.2168,KC= 0.2298
Ncalc = 1.57 |
| Optical Data: |
Biaxial (-), a=1.535, b=1.542, g=1.549, bire=0.0140, 2V(Calc)=88, 2V(Meas)=12-18. |
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Calculated Properties of Foshallasite
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| Electron Density: |
Bulk Density (Electron Density)=2.54 gm/cc
note: Specific Gravity of Foshallasite =2.50 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0083610278
Boson Index = 0.9916389722 |
| Photoelectric: |
PEFoshallasite = 4.90 barns/electron
U=PEFoshallasite x rElectron Density= 12.46 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Foshallasite is Not Radioactive |
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Foshallasite Classification
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| Dana Class: |
56.02.09.03 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O |
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(56.02)with cations in [4] and/or >[4] coordination |
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(56.02.09)Tilleyite - Killalaite group |
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56.02.09.01 Tilleyite Ca5Si2O7(CO3)2 P 21/a 2/m |
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56.02.09.02 Killalaite 2Ca3Si2O7•(H2O) P 21/m 2/m |
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56.02.09.03 Foshallasite? Ca3Si2O7•3(H2O) Mono |
| Strunz Class: |
09.HA.55 09 - SILICATES (Germanates) |
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09.H - Unclassified Silicates |
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09.HA -With alkali and alkali-earth Elements |
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09.HA.55 Foshallasite? Ca3Si2O7•3(H2O) Mono |
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Other Foshallasite Information
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| References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
| 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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Print or Cut-and-Paste your Foshallasite Specimen Label here :
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Foshallasite
Ca3Si2O7•3(H2O)
Dana No: 56.02.09.03 Strunz No: 09.HA.55
Locality:
Notes:
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