Foshagite Mineral Data

Foshagite Mineral Data +

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General Foshagite Information

Chemical Formula:

Ca4Si3O9(OH)2

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

Empirical Formula:

Ca₄Si₃O₉(OH)₂

Environment:

Metamorphosed limestone.

IMA Status:

Valid Species (Pre-IMA) 1925

Locality:

Crestmore quarry, 5 miles NW of Riverside, Riverside Co. California. Link to MinDat.org Location Data.

Name Origin:

Named for William Fredrick Foshag (1894-1956), mineralogist and former curator at U. S. National Museum.

Synonym:

ICSD 25818

PDF 29-377

Foshagite Image

Images:

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

Axial Ratios:

a:b:c =2.8423:1:1.9213

Cell Dimensions:

a = 10.406, b = 3.661, c = 7.034, Z = 1; beta = 107.07° V = 256.16 Den(Calc)= 2.74

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.953(1), 3.36(0.25), 4.96(0.25),

Physical Properties of Foshagite

Cleavage:

[001] Distinct

Color:

Snow white.

Density:

2.36

Diaphaniety:

Translucent

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Fibrous - Crystals made up of fibers.

Luminescence:

Non-fluorescent.

Luster:

Silky

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Foshagite

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

Optical Data:

Biaxial (+), a=1.594, b=1.594, g=1.598, bire=0.0040

Calculated Properties of Foshagite

Electron Density:

r_electron=2.75 gm/cc
note: r_Foshagite=2.74 gm/cc.

Fermion Index

Fermion Index = 0.01002
Boson Index = 0.98998

Photoelectric:

PE_Foshagite= 5.40 barns/electron
U=PE_Foshagite x r_electron= 14.85 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Foshagite is Not Radioactive

Foshagite Classification

Dana Class:

65.2.2.1 (65)Inosilicate Single-Width Unbranched Chains, W=1

(65.2)with chains P=3

(65.2.2)Dana Group

65.2.2.1 Foshagite Ca4Si3O9(OH)2 P 2₁/m 2/m

Strunz Class:

VIII/F.18-90 VIII - Silicates

VIII/F - Inosilicates (chain and band) Triplet chains [Si3O9]6-

VIII/F.18 - Wollastonite-2M - Foshagite series

VIII/F.18-10 Wollastonite-1A CaSiO3 P1 1

VIII/F.18-10* Wollastonite-2M* CaSiO3 P 2₁ 2

VIII/F.18-10** Wollastonite-3A-4A-5A-7A* CaSiO3 P1 1

VIII/F.18-30 Ferrobustamite Ca(Fe,Ca,Mn)Si2O6 P1 1

VIII/F.18-40 Bustamite (Mn,Ca)3Si3O9 P1 1

VIII/F.18-50 Cascandite Ca(Sc,Fe)Si3O8(OH) C1 1

VIII/F.18-60 Pectolite NaCa2Si3O8(OH) P1 1

VIII/F.18-70 Denisovite (K,Na)Ca2Si3O8(F,OH) Mono

VIII/F.18-80 Serandite Na(Mn,Ca)2Si3O8(OH) P1 1

VIII/F.18-90 Foshagite Ca4Si3O9(OH)2 P 2₁/m 2/m

VIII/F.18-100 Hillebrandite Ca6Si3O9(OH)6 C mc2₁ mm2

Other Foshagite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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Print or Cut-and-Paste your Foshagite Specimen Label here :

Foshagite

Ca4Si3O9(OH)2
Dana No: 65.2.2.1 Strunz No: VIII/F.18-90
Locality:

Notes: