Potassic-carpholite Mineral Data

Potassic-carpholite Mineral Data

General Potassic-carpholite Information

Chemical Formula:

(K,Na,[ ])(Li,Mn++)2Al)4Si4O12(OH)4(F,OH)4

Composition:

Molecular Weight = 656.83 gm

Potassium 3.33 % K 4.02 % K₂O

Sodium 0.39 % Na 0.52 % Na₂O

Lithium 0.63 % Li 1.36 % Li₂O

Manganese 10.54 % Mn 13.61 % MnO

Aluminum 15.82 % Al 29.88 % Al₂O₃

Iron 1.11 % Fe 1.42 % FeO

Silicon 17.45 % Si 37.32 % SiO₂

Hydrogen 0.82 % H 7.36 % H₂O

Oxygen 42.31 % O

Fluorine 7.61 % F 7.61 % F

- % F -3.20 % -O=F₂

______ ______

100.00 % 99.90 % = TOTAL OXIDE

Empirical Formula:

K_0.56Na_0.11Mn²⁺_1.26Fe²⁺_0.13Li_0.6Al_3.85Si_4.08O₁₂(OH)₄F_2.63(OH)_1.37

Environment:

Miarolitic cavities in an anorogenic Tertiary granite pluton. Carpholite group

IMA Status:

Approved IMA 2004 (Dana # Added)

Locality:

Sawtooth Batholith, near Centerville, Boise County, Idaho, USA. Link to MinDat.org Location Data.

Name Origin:

Named as the potassium-dominant member of carpholite.

Synonym:

IMA2002-064

Potassic-carpholite Image

Images:

Potassic-carpholite

Comments: Tan prismatic crystal sprays of potassic-carpholite to about 2mm in matrix.
Location: Sawtooth Batholith, near Centerville, Boise Co., Idaho, USA. Scale: Picture size 5 mm.
© Tom Loomis / Dakota Matrix

Potassic-carpholite Crystallography

Axial Ratios:

a:b:c =0.6755:1:0.253

Cell Dimensions:

a = 13.715, b = 20.302, c = 5.138, Z = 4; V = 1,430.63 Den(Calc)= 3.05

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): 2.613(1)(351), 5.705(1)(220), 3.048(0.9)(331),1.467(0.8), 2.05(0.8)(621), 2.744(0.8)(421), 3.433(0.8)(400), 3.819(0.8)(221),

Physical Properties of Potassic-carpholite

Cleavage:

[010] Perfect

Color:

White, Straw yellow.

Density:

3.08

Diaphaniety:

Transparent

Fracture:

Brittle - Irregular - Very brittle fracture producing irregular fragments

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

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

Habit:

Tuft - Cottony aggragate of very fine, acicular crystals

Hardness:

5 - Apatite

Luster:

Silky

Streak:

white

Optical Properties of Potassic-carpholite

Gladstone-Dale:

CI meas= 0.092 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.083 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1932,KPDmeas= 0.1913,KC= 0.2106

Optical Data:

Biaxial (-), a=1.578, b=1.592, g=1.598, bire=0.0200

Calculated Properties of Potassic-carpholite

Electron Density:

r_electron=3.01 gm/cc
note: r_{Potassic-carpholite}=3.05 gm/cc.

Fermion Index

Fermion Index = 0.00906
Boson Index = 0.99094

Photoelectric:

PE_{Potassic-carpholite}= 4.51 barns/electron
U=PE_{Potassic-carpholite} x r_electron= 13.55 barns/cc.

Radioactivity:

GRapi = 47.40 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Potassic-carpholite - barely detectable

Potassic-carpholite Classification

Dana Class:

65.1.5.5 (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/FX.00-00 VIII - Silicates

VIII/FX - Unclassified Strunz Inosilicates

VIII/FX.00 - Carpholite group

Other Potassic-carpholite Information

References:

NAME( CanMin, v 42, p 121) PHYS. PROP.(CanMin, v 42, p 121) OPTIC PROP.(CanMin, v 42, p 121)

See Also:

Links to other databases for Potassic-carpholite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Print or Cut-and-Paste your Potassic-carpholite Specimen Label here :

Potassic-carpholite

(K,Na,[ ])(Li,Mn++)2Al)4Si4O12(OH)4(F,OH)4
Dana No: 65.1.5.5 Strunz No: VIII/FX.00-00
Locality:

Notes: