Foggite Mineral Data

Foggite Mineral Data +

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General Foggite Information

Chemical Formula:

CaAl(PO4)(OH)2·(H2O)

Composition:

Molecular Weight = 214.06 gm

Calcium 18.72 % Ca 26.20 % CaO

Aluminum 12.60 % Al 23.82 % Al₂O₃

Phosphorus 14.47 % P 33.16 % P₂O₅

Hydrogen 1.88 % H 16.83 % H₂O

Oxygen 52.32 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaAl(PO₄)(OH)₂·(H₂O)

Environment:

Secondary mineral, probably formed at < 300 deg. C in complex granite pegmatites.

IMA Status:

Approved IMA 1975

Locality:

Palermo #1 mine, near North Groton, Grafton County, New Hamshire, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Forrest. F. Fogg (1920-), mineral collector, New Hampshire, USA.

Synonym:

ICSD 4261

PDF 29-282

Foggite Image

Images:

Foggite

Comments: Bright yellow, rounded crystalline aggregates of foggite on matrix.
Location: Palermo #1 mine, North Groton, Crafton County, New Hampshire, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Foggite Crystallography

Axial Ratios:

a:b:c =0.4347:1:0.2433

Cell Dimensions:

a = 9.27, b = 21.324, c = 5.19, Z = 8; V = 1,025.93 Den(Calc)= 2.77

Crystal System:

Orthorhombic - DisphenoidalH-M Symbol (2 2 2) Space Group: A2122

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

By Intensity(I/I_o): 4.24(1), 2.693(0.8), 3.109(0.7),

Crystal Structure:

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Moore P B , Kampf A R , Araki T , American Mineralogist , 60 (1975) p.965-971, Foggite, Ca(H2O)2[CaAl2(OH)4(PO4)2]: Its atomic arrangement and, relationship to calcium Tschermak s pyroxene

Physical Properties of Foggite

Cleavage:

[010] Perfect, [100] Good

Color:

Colorless, White.

Density:

2.78

Diaphaniety:

Transparent

Hardness:

4 - Fluorite

Streak:

white

Optical Properties of Foggite

Gladstone-Dale:

CI meas= 0.012 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.008 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2203,KPDmeas= 0.2195,KC= 0.2222

Optical Data:

Biaxial (+), a=1.61, b=1.61, g=1.611, bire=0.0010, 2V(Calc)=0, 2V(Meas)=40-45.

Calculated Properties of Foggite

Electron Density:

r_electron=2.80 gm/cc
note: r_Foggite=2.77 gm/cc.

Fermion Index

Fermion Index = 0.0005
Boson Index = 0.9995

Photoelectric:

PE_Foggite= 3.37 barns/electron
U=PE_Foggite x r_electron= 9.42 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Foggite is Not Radioactive

Foggite Classification

Dana Class:

42.7.2.1 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.7)where (AB)5 (XO4)3 Zq · x(H2O)

(42.7.2)Dana Group

42.7.2.1 Foggite CaAl(PO4)(OH)2·(H2O) A2122 2 2 2

42.7.2.2 Krasnovite! Ba(Al,Mg)(PO4,CO3)(OH)2·(H2O) Pnna,Pnnn 2/m 2/m 2/m

Strunz Class:

VII/D.50-20 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of very big and medium size: Al, Mg and Ca, Na, K

VII/D.50 - Matulaite - Morinite series

VII/D.50-10 Matulaite CaAl18(PO4)12(OH)20·28(H2O) P 2₁/c 2/m

VII/D.50-20 Foggite CaAl(PO4)(OH)2·(H2O) A2122 2 2 2

VII/D.50-25 Krasnovite! Ba(Al,Mg)(PO4,CO3)(OH)2·(H2O) Pnna,Pnnn 2/m 2/m 2/m

VII/D.50-30 Morinite NaCa2Al2(PO4)2(F,OH)5·2(H2O) P 2₁/m 2/m

Other Foggite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Foggite

CaAl(PO4)(OH)2·(H2O)
Dana No: 42.7.2.1 Strunz No: VII/D.50-20
Locality:

Notes: