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Potassiccarpholite

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Big Photo

Glens Peak, Sawtooth Batholith/Sawtooth Mts, Boise Co., Idaho, USA
© Wm. C. van Laer




Formula:
(K,☐)(Li,Mn
2+
 
)
 
2
Al
 
4
(Si
 
2
O
 
6
)
 
2
(OH,F)
 
8
System:OrthorhombicColour:White, straw-yellow
Hardness:5
Member of:Carpholite Group
Name:Denotes the relation to carpholite, and the substitution of potassium for the vacancy at the A(2)site
This page provides mineralogical data about Potassiccarpholite.

Classification of Potassiccarpholite

IMA status:Approved 2002
Nickel-Strunz 10th (pending) edition ID:9.DB.05

9 : SILICATES (Germanates)
D : Inosilicates
B : Inosilicates with 2-periodic single chains, Si2O6; Pyroxene-related minerals
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Type Occurrence of Potassiccarpholite

Type Locality:Sawtooth batholith, Idaho, USA
General Appearance of Type Material:Irregular tufts (up to 2mm across) of radiating acicular to fibrous crystals in miarolitc cavities
Place of Conservation of Type Material:Canadian Museum of Nature, Ottawa, Ontario, Canada
Geological Setting of type material:Anorogenic Tertiary granite pluton
Associated Minerals at type locality:
ZinnwalditeTopazQuartzMicroclineHematite
HellanditeFluoriteFluorapatiteBerylBertrandite
Albite

Physical Properties of Potassiccarpholite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:White, straw-yellow
Streak:white
Hardness (Mohs):5
Hardness Data:Measured
Cleavage:Perfect
parallel to [100]
Fracture:Irregular/Uneven
Density (measured):3.08 g/cm3
Density (calculated):3.06 g/cm3

Crystallography of Potassiccarpholite

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:Ccca {C2/c 2/c 2/a}
Cell Parameters:a = 13.715Å, b = 20.302Å, c = 5.138Å
Ratio:a:b:c = 0.676 : 1 : 0.253
Unit Cell Volume:V 1430.6 ų
Z:4
Morphology:acicular, elongate along [100]
Twinning:not observed
X-Ray Powder Diffraction:
d-spacingIntensity
5.705 (100)
3.819 (80)
3.433 (80)
3.048 (90)
2.744 (80)
2.613 (100)
2.050 (80)

Optical Data of Potassiccarpholite

Type:Biaxial (-)
RI values: nα = 1.578 nβ = 1.592 nγ = 1.598
2V:Measured: 57° , Calculated: 66°
Maximum Birefringence:δ = 0.020

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Pleochroism:Weak
Comments:X pale yellow, Y=Z colorless, with X>Y,Z and X=b, Y=a, and Z=c
Comments:measured with a Bloss spindle stage for the wavelength 590nm using a gel filter

Chemical Properties of Potassiccarpholite

Formula:
(K,☐)(Li,Mn
2+
 
)
 
2
Al
 
4
(Si
 
2
O
 
6
)
 
2
(OH,F)
 
8
Essential elements:Al, H, K, Li, O, Si
All elements listed in formula:Al, F, H, K, Li, Mn, O, Si

Relationship of Potassiccarpholite to other Species

Member of:Carpholite Group
Other Members of Group:

- +
Carpholite
Mn
2+
 
Al
 
2
(Si
 
2
O
 
6
)(OH)
 
4
Ferrocarpholite
(Fe
2+
 
,Mg)Al
 
2
(Si
 
2
O
 
6
)(OH)
 
4
Magnesiocarpholite
(Mg,Fe
2+
 
)Al
 
2
(Si
 
2
O
 
6
)(OH)
 
4
Vanadiocarpholite
Mn
2+
 
V
3+
 
Al(Si
 
2
O
 
6
)(OH)
 
4
Related Minerals - Nickel-Strunz Grouping):

- +
9.DB.05Balipholite
BaLiMg
 
2
Al
 
3
(Si
 
2
O
 
6
)
 
2
(OH)
 
4
9.DB.05Carpholite
Mn
2+
 
Al
 
2
(Si
 
2
O
 
6
)(OH)
 
4
9.DB.05Ferrocarpholite
(Fe
2+
 
,Mg)Al
 
2
(Si
 
2
O
 
6
)(OH)
 
4
9.DB.05Magnesiocarpholite
(Mg,Fe
2+
 
)Al
 
2
(Si
 
2
O
 
6
)(OH)
 
4
9.DB.05Vanadiocarpholite
Mn
2+
 
V
3+
 
Al(Si
 
2
O
 
6
)(OH)
 
4
9.DB.10Lorenzenite
Na
 
2
Ti
 
2
(Si
 
2
O
 
6
)O
 
3
9.DB.15Lintisite
LiNa
 
3
Ti
 
2
(Si
 
2
O
 
6
)
 
2
O
 
2
 · 2H
 
2
O
9.DB.15Punkaruaivite
LiTi
 
2
(HSi
 
4
O
 
12
)(OH)
 
2
 · H
 
2
O
9.DB.17Eliseevite
LiNa
 
1.5
Ti
 
2
(H
 
1.5
Si
 
4
O
 
12
)O
 
2
 · 2H
 
2
O
9.DB.20Kukisvumite
Na
 
6
ZnTi
 
4
(Si
 
8
O
 
24
)O
 
4
 · 4H
 
2
O
9.DB.20Manganokukisvumite
Na
 
6
MnTi
 
4
(Si
 
8
O
 
24
)O
 
4
 · 4H
 
2
O
9.DB.25Vinogradovite
(Na,Ca,K)
 
4
Ti
 
4
AlSi
 
6
O
 
23
(OH) · 2H
 
2
O
9.DB.25Paravinogradovite
Na
 
1-2
(Ti,Fe
3+
 
)
 
4
(Si
 
2
O
 
6
)
 
2
(AlSi
 
3
O
 
10
)(OH)
 
4
 · H
 
2
O
9.DB.30Nchwaningite
Mn
2+
2
(SiO
 
3
)(OH)
 
2
 · H
 
2
O
9.DB.35Plancheite
Cu
 
8
(Si
 
8
O
 
22
)(OH)
 
4
 · H
 
2
O
9.DB.40Shattuckite
Cu
 
5
(Si
 
2
O
 
6
)
 
2
(OH)
 
2
9.DB.40UM2005-31-SiO:CuH
Cu
 
11
(SiO
 
4
)(OH)
 
18
 · 9H
 
2
O ?
9.DB.45Aerinite
(Ca
 
5.1
Na
 
0.5
)(Fe
3+
 
,Al,Fe
2+
 
,Mg)
 
4
(Al,Mg)
 
6
[HSi
 
12
O
 
36
(OH)
 
12
][(CO
 
3
)
 
1.2
(H
 
2
O)
 
12
]
9.DB.50Capranicaite
KCaNaAl
 
4
B
 
4
Si
 
2
O
 
18

Other Names for Potassiccarpholite

Synonyms:
IMA2002-064
Other Languages:
German:Kaliumkarpholith

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Potassiccarpholite

Reference List:

- +
Tait, K.T., Hawthorne, F.C., Grice, J.D., Jambor, J.L., and Pinch, W.W. (2004) Potassic-carpholite, a new mineral species from the Sawtooth batholith, Boise County, Idaho, U.S.A. Canadian Mineralogist (2004) 42, 121-124.

Internet Links for Potassiccarpholite

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    • Localities for Potassiccarpholite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    USA
     
    • Idaho
      • Boise Co.
    		The Canadian Mineralogist, V 42, 2004, pp. 121-124.
      • Elmore Co.
        • Glens Peak Area
          • Sawtooth Primitive Area
    		WC van Laer, 2009
    W.C. van Laer, 2009
    Idaho Minerals (2004) L. Ream 2nd ed
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