Carpholite Mineral Data

Carpholite Mineral Data

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General Carpholite Information

Chemical Formula:

MnAl2Si2O6(OH)4

Composition:

Molecular Weight = 329.10 gm

Manganese 16.69 % Mn 21.56 % MnO

Aluminum 16.40 % Al 30.98 % Al₂O₃

Silicon 17.07 % Si 36.51 % SiO₂

Hydrogen 1.23 % H 10.95 % H₂O

Oxygen 48.62 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺Al₂Si₂O₆(OH)₄

IMA Status:

Valid Species (Pre-IMA) 1817

Locality:

Schlaggenwald, Bohemia. Link to MinDat.org Location Data.

Name Origin:

From the Greek karfos - "straw" and lithos - "stone."

Synonym:

ICSD 34520

PDF 19-273

Carpholite Image

Images:

Carpholite

Comments: Golden yellow compact radiating massive carpholite.
Location: Schlaggenwald, Bohemia, Zapadocesky, Czech Republic. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Carpholite Crystallography

Axial Ratios:

a:b:c =0.6885:1:0.2543

Cell Dimensions:

a = 13.86, b = 20.13, c = 5.12, Z = 8; V = 1,428.49 Den(Calc)= 3.06

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): 5.73(1), 5.08(0.7), 2.62(0.5),

Crystal Structure:

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Ghose S , Sen Gupta P K , Boggs R C , Schlemper E O , American Mineralogist , 74 (1989) p.1084-1090, Crystal chemistry of a nonstoichiometric carpholite,, Kx(Mn2-x,Lix)Al4Si4O12(OH)4F4: A chain silicate related to pyroxenes, Locality: Sawtooth batholith, Idaho, USA

View Additional jPOWD Structure files for Carpholite
[1] [2]

Physical Properties of Carpholite

Cleavage:

[100] Imperfect, [010] Imperfect, [110] Imperfect

Color:

Straw yellow, Greenish gray, Yellowish brown.

Density:

2.9

Diaphaniety:

Transparent to translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Massive - Fibrous - Distinctly fibrous fine-grained forms.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

5.5 - Knife Blade

Luster:

Silky

Streak:

white

Optical Properties of Carpholite

Gladstone-Dale:

CI meas= 0.023 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.074 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2035,KPDmeas= 0.2147,KC= 0.2198

Optical Data:

Biaxial (-), a=1.61, b=1.628, g=1.63, bire=0.0200

Calculated Properties of Carpholite

Electron Density:

r_electron=2.87 gm/cc
note: r_Carpholite=2.90 gm/cc.

Fermion Index

Fermion Index = 0.0082
Boson Index = 0.9918

Photoelectric:

PE_Carpholite= 5.33 barns/electron
U=PE_Carpholite x r_electron= 15.32 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Carpholite is Not Radioactive

Carpholite Classification

Dana Class:

65.1.5.1 (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.03-30 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 Carpholite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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Carpholite

MnAl2Si2O6(OH)4
Dana No: 65.1.5.1 Strunz No: VIII/F.03-30
Locality:

Notes: