Mineralogy Database

Foshagite Mineral Data

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General Foshagite Information

Help on Chemical  Formula: Chemical Formula: Ca4Si3O9(OH)2
Help on Composition: Composition: Molecular Weight = 422.58 gm
   Calcium   37.94 %  Ca   53.08 % CaO
   Silicon   19.94 %  Si   42.66 % SiO2
   Hydrogen   0.48 %  H     4.26 % H2O
   Oxygen    41.65 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca4Si3O9(OH)2
Help on Environment: Environment: Metamorphosed limestone.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1925
Help on Locality: Locality: Crestmore quarry, 5 miles NW of Riverside, Riverside Co. California. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for William Fredrick Foshag (1894-1956), mineralogist and former curator at U. S. National Museum.
Help on Name Pronunciation: Name Pronunciation: Foshagite + Pronunciation Say FOSHAGITE
Help on Synonym: Synonym: ICSD 25818
  PDF 29-377
 

Foshagite Image

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  Foshagite

Comments: Tan to gray fibrous to columnar aggregate of foshagite.
Location: Crestmore Quarry, Riverside County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Foshagite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.8423:1:1.9213
Help on Cell Dimensions: Cell Dimensions: a = 10.406, b = 3.661, c = 7.034, Z = 1; beta = 107.07° V = 256.16 Den(Calc)= 2.74
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): 2.953(1), 3.36(0.25), 4.96(0.25),
 

Physical Properties of Foshagite

Help on Cleavage: Cleavage: {001} Distinct
Help on Color: Color: Snow white.
Help on Density: Density: 2.36
Help on Diaphaneity: Diaphaneity: Translucent
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Luminescence: Luminescence: Fluorescent, Short UV=yellowish to blue white, Long UV=butter yellow.
Help on Luster: Luster: Silky
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white
 

Optical Properties of Foshagite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.175 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.012 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2173,KPDmeas= 0.2523,KC= 0.2147
Ncalc = 1.51 - 1.59
Help on Optical Data: Optical Data: Biaxial (+), a=1.594, b=1.594, g=1.598, bire=0.0040
 

Calculated Properties of Foshagite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.75 gm/cc
note: Specific Gravity of Foshagite =2.74 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEFoshagite = 5.40 barns/electron
U=PEFoshagite x rElectron Density= 14.85 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Foshagite is Not Radioactive
 

Foshagite Classification

Help on  Dana Class: Dana Class: 65.02.02.01 (65)Inosilicate Single-Width Unbranched Chains, W=1
  (65.02)with chains P=3
  (65.02.02)Dana Group
 
65.02.02.01 Foshagite Ca4Si3O9(OH)2 P 21/m 2/m
Help on  Strunz Class: Strunz Class: 09.DG.15 09 - SILICATES (Germanates)
  09.D - Inosilicates* Structural terminology according to Liebau (1985)
  09.DG -Inosilicates with 3-periodic single and multiple chains
 
09.DG.15 Foshagite Ca4Si3O9(OH)2 P 21/m 2/m
 

Other Foshagite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Collectors Book of Fluorescent Minerals) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Foshagite :
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 Foshagite Specimen Label here :

Foshagite

Ca4Si3O9(OH)2
Dana No: 65.02.02.01 Strunz No: 09.DG.15
Locality:

 

Notes:

 

 
   
 


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