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Potassiccarpholite

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

Formula:
(K,[])(Li,Mn
2+
 
)
 
2
Al
 
4
[(OH)
 
4
 ׀ (F,OH)
 
4
 ׀ (Si
 
2
O
 
6
)
 
2
]
System:OrthorhombicColour:White, straw-yellow
Hardness:5
Name:Denotes the relation to carpholite, and the substitution of potassium for the vacancy at the A(2)site


Carpholite Group

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
HellanditeFluoriteBerylBertranditeApatite-(CaF)
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)

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
[(OH)
 
4
 ׀ (F,OH)
 
4
 ׀ (Si
 
2
O
 
6
)
 
2
]
All elements listed in formula:Al, F, H, K, Li, Mn, O, Si

Relationship of Potassiccarpholite to other Species

Member of Group:
Carpholite Group:
Related Minerals - Nickel-Strunz Grouping):

- +
9.DB.05Balipholite
BaLiMg
 
2
Al
 
3
[(OH)
 
4
|Si
 
2
O
 
6
]
 
2
9.DB.05Carpholite
Mn
2+
 
Al
 
2
[(OH)
 
4
|Si
 
2
O
 
6
]
9.DB.05Ferrocarpholite
(Fe
2+
 
,Mg)Al
 
2
[(OH)
 
4
|Si
 
2
O
 
6
]
9.DB.05Magnesiocarpholite
(Mg,Fe
2+
 
)Al
 
2
[(OH)
 
4
|Si
 
2
O
 
6
]
9.DB.05Vanadiocarpholite
Mn
2+
 
V
3+
 
Al[(OH)
 
4
|Si
 
2
O
 
6
]
9.DB.10Lorenzenite
Na
 
2
Ti
 
2
[O
 
3
|Si
 
2
O
 
6
]
9.DB.15Lintisite
LiNa
 
3
Ti
 
2
[O|Si
 
2
O
 
6
]
 
2
 · 2H
 
2
O
9.DB.20Kukisvumite
Na
 
6
ZnTi
 
4
Si
 
8
O
 
28
·4H
 
2
O
9.DB.20Manganokukisvumite
Na
 
6
MnTi
 
4
Si
 
8
O
 
28
·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
[(OH)
 
4
|AlSi
 
3
O
 
10
|(Si
 
2
O
 
6
)
 
2
] · H
 
2
O
9.DB.30Nchwaningite
Mn
2+
2
[(OH)
 
2
|SiO
 
3
] · H
 
2
O
9.DB.35Plancheite
Cu
 
8
[(OH)
 
4
|Si
 
8
O
 
22
] · H
 
2
O
9.DB.40Shattuckite
Cu
 
5
[(OH)
 
2
|(SiO
 
3
)
 
4
]
9.DB.40UM2005-31-SiO:CuH
Cu
 
11
(SiO
 
4
)(OH)
 
18
·9H
 
2
O ?
9.DB.45Aerinite
Ca
 
5
(Fe
3+
 
,Al,Fe
2+
 
,Mg)(Al,Mg)
 
6
[HSi
 
12
O
 
36
(OH)
 
12
][(CO
 
3
)
 
1.2
(H
 
2
O)
 
12
]

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

    Hide Locality List
    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.
    (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
    Mineral and/or Locality
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 13th Nov 2009 09:47:27