Ferrocarpholite Mineral Data

Ferrocarpholite Mineral Data +

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General Ferrocarpholite Information

Chemical Formula:

(Fe++,Mg)Al2Si2O6(OH)4

Composition:

Molecular Weight = 322.12 gm

Magnesium 1.89 % Mg 3.13 % MgO

Aluminum 16.75 % Al 31.65 % Al₂O₃

Iron 13.00 % Fe 16.73 % FeO

Silicon 17.44 % Si 37.31 % SiO₂

Hydrogen 1.25 % H 11.19 % H₂O

Oxygen 49.67 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺_0.75Mg_0.25Al₂Si₂O₆(OH)₄

IMA Status:

Valid Species (Pre-IMA) 1951

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 34519

PDF 33-655

Ferrocarpholite Image

Images:

Ferrocarpholite

Comments: Pale yellow radiating ferrocarpholite crystals.
Location: Krasno, Zapadocesky, Czech Republic. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Ferrocarpholite Crystallography

Axial Ratios:

a:b:c =0.683:1:0.2532

Cell Dimensions:

a = 13.797, b = 20.2, c = 5.116, Z = 8; V = 1,425.83 Den(Calc)= 3.00

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: C cca

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

By Intensity(I/I_o): 5.04(1), 5.69(0.7), 3.355(0.3),

Crystal Structure:

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Ferraris G , Ivaldi G , Goffe B , Neues Jahrbuch fur Mineralogie, Monatshefte , 1992 (1992) p.337-347, Structural study of a magnesian ferrocarpholite: Are carpholites monoclinic?, Locality: Mascate nappes, Ruwi, Oman

Physical Properties of Ferrocarpholite

Cleavage:

[010] Perfect, [110] Indistinct

Color:

Gray green, Dark green.

Density:

3.04

Diaphaniety:

Translucent

Hardness:

5.5 - Knife Blade

Luster:

Silky

Streak:

greenish white

Optical Properties of Ferrocarpholite

Gladstone-Dale:

CI meas= 0.059 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.046 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2088,KPDmeas= 0.206,KC= 0.2189

Optical Data:

Biaxial (-), a=1.614, b=1.63, g=1.635, bire=0.0210, 2V(Calc)=56, 2V(Meas)=58.

Calculated Properties of Ferrocarpholite

Electron Density:

r_electron=2.99 gm/cc
note: r_{Ferrocarpholite}=3.00 gm/cc.

Fermion Index

Fermion Index = 0.01302
Boson Index = 0.98698

Photoelectric:

PE_{Ferrocarpholite}= 5.03 barns/electron
U=PE_{Ferrocarpholite} x r_electron= 15.03 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ferrocarpholite is Not Radioactive

Ferrocarpholite Classification

Dana Class:

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

(65.1)with chains P=2

(65.1.5)Carpholite group

65.1.5.1 Carpholite MnAl2Si2O6(OH)4 C cca 2/m 2/m 2/m

65.1.5.2 Ferrocarpholite (Fe,Mg)Al2Si2O6(OH)4 C cca 2/m 2/m 2/m

65.1.5.3 Magnesiocarpholite MgAl2Si2O6(OH)4 C cca 2/m 2/m 2/m

65.1.5.4 Balipholite BaMg2LiAl3Si4O12(OH,F)8 C cca 2/m 2/m 2/m

65.1.5.5 Potassic-carpholite! (K,Na,[])(Li,Mn)2Al)4Si4O12(OH)4(F,OH)4 C cca 2/m 2/m 2/m

65.1.5.6 Vanadiocarpholite! MnVAl(Si2O6)(OH)4 C cca 2/m 2/m 2/m

Strunz Class:

VIII/F.03-20 VIII - Silicates

VIII/F - Inosilicates (chain and band) double chains [Si2O6]4-

VIII/F.03 - Magnesiocarpholite - Vinogradovite series

VIII/F.03-10 Magnesiocarpholite MgAl2Si2O6(OH)4 C cca 2/m 2/m 2/m

VIII/F.03-20 Ferrocarpholite (Fe,Mg)Al2Si2O6(OH)4 C cca 2/m 2/m 2/m

VIII/F.03-30 Carpholite MnAl2Si2O6(OH)4 C cca 2/m 2/m 2/m

VIII/F.03-40 Balipholite BaMg2LiAl3Si4O12(OH,F)8 C cca 2/m 2/m 2/m

VIII/F.03-50 Lorenzenite Na2Ti2Si2O9 P bcn 2/m 2/m 2/m

VIII/F.03-60 Lintisite Na3LiTi2Si4O14·2(H2O) C 2/c 2/m

VIII/F.03-70 Vinogradovite (Na,K)4Ti4(Si,Al)8O26·3(H2O,Na) A2/a 2/m

VIII/F.03-80 Paravinogradovite! (Na,[])2(Ti,Fe)4(Si2O6)2(Si3AlO10)(OH)4·H2O P1 1

Other Ferrocarpholite Information

References:

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

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Ferrocarpholite

(Fe++,Mg)Al2Si2O6(OH)4
Dana No: 65.1.5.2 Strunz No: VIII/F.03-20
Locality:

Notes: