Potassiccarpholite Mineral Data

General Potassiccarpholite 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:

Fall Creek drainage, in the vicinity of Glens Peak, Boise County, Idaho (corrected from Sawtooth Batholith location). Link to MinDat.org Location Data.

Name Origin:

Named as the potassium-dominant member of carpholite.

Synonym:

IMA2002-064

Potassic-carpholite - Renamed Potassiccarpholite by Mineralogical Record, v39 (2008), p131

Potassiccarpholite Image

Images:

Potassiccarpholite

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

Potassiccarpholite 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 - Dipyramidal H-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 Potassiccarpholite

Cleavage:

{010} Perfect

Color:

White, Straw yellow.

Density:

3.08

Diaphaneity:

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 Potassiccarpholite

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
Ncalc = 1.64 - 1.65

Optical Data:

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

Calculated Properties of Potassiccarpholite

Electron Density:

Bulk Density (Electron Density)=3.01 gm/cc
note: Specific Gravity of Potassiccarpholite =3.05 gm/cc.

Fermion Index:

Fermion Index = 0.0090654006
Boson Index = 0.9909345994

Photoelectric:

PE_{Potassiccarpholite}= 4.51 barns/electron
U=PE_{Potassiccarpholite} x r_electron= 13.55 barns/cc.

Radioactivity:

GRapi = 47.41 (Gamma Ray American Petroleum Institute Units)
Concentration of Potassiccarpholite per GRapi unit = 2.11 (%)

Estimated Radioactivity from Potassiccarpholite - barely detectable

Potassiccarpholite Classification

Dana Class:

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

(65.01)with chains P=2

(65.01.05)Carpholite group

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

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

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

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

65.01.05.05 Potassiccarpholite! (K,Na,[])(Li,Mn)2Al)4Si4O12(OH)4(F,OH)4 C cca 2/m 2/m 2/m

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

Strunz Class:

09.DB.05 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DB -Inosilicates with 2-periodic single chains, Si2O6; Pyroxene-related minerals

09.DB.05 Carpholite MnAl2Si2O6(OH)4 C cca 2/m 2/m 2/m

09.DB.05 Balipholite BaMg2LiAl3Si4O12(OH,F)8 C cca 2/m 2/m 2/m

09.DB.05 Ferrocarpholite (Fe,Mg)Al2Si2O6(OH)4 C cca 2/m 2/m 2/m

09.DB.05 Magnesiocarpholite MgAl2Si2O6(OH)4 C cca 2/m 2/m 2/m

09.DB.05 Potassiccarpholite! (K,Na,[])(Li,Mn)2Al)4Si4O12(OH)4(F,OH)4 C cca 2/m 2/m 2/m

09.DB.05 Vanadiocarpholite! MnVAl(Si2O6)(OH)4 C cca 2/m 2/m 2/m

Other Potassiccarpholite 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 Potassiccarpholite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Potassiccarpholite

(K,Na,[ ])(Li,Mn++)2Al)4Si4O12(OH)4(F,OH)4
Dana No: 65.01.05.05 Strunz No: 09.DB.05
Locality:

Notes:

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