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 % K2 O
Sodium 0.39 % Na 0.52 % Na2 O
Lithium 0.63 % Li 1.36 % Li2 O
Manganese 10.54 % Mn 13.61 % MnO
Aluminum 15.82 % Al 29.88 % Al2 O3
Iron 1.11 % Fe 1.42 % FeO
Silicon 17.45 % Si 37.32 % SiO2
Hydrogen 0.82 % H 7.36 % H2 O
Oxygen 42.31 % O
Fluorine 7.61 % F 7.61 % F
- %
F -3.20 % -O=F2
______ ______
100.00 % 99.90 % = TOTAL OXIDE
Empirical Formula:
K0.56 Na0.11 Mn2+ 1.26 Fe2+ 0.13 Li0.6 Al3.85 Si4.08 O12 (OH)4 F2.63 (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
X Ray Diffraction:
By Intensity(I/Io ): 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:
PEPotassiccarpholite = 4.51 barns/electronU=PEPotassiccarpholite 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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