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Pinakiolite

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Långban, Filipstad, Värmland, Sweden
© O. Dziallas

Show Pinakiolite Photos (8)
Formula:
(Mg,Mn
2+
 
)
 
2
Mn
3+
 
[O
 
2
|BO
 
3
]
System:MonoclinicColour:Black; deep reddish ...
Hardness:6
Name:From the Greek πίυάκου, a small tablet, and λίθος, stone, in allusion to the thin tabular shape of the crystals.
Dimorph of:Orthopinakiolite


The monoclinic dimorph of Orthopinakiolite.

Classification of Pinakiolite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:5/G.03-20
Nickel-Strunz 10th (pending) edition ID:6.AB.35

6 : BORATES
A : Monoborates
B : BO3, with additional anions; 1(D) + OH, etc.
Dana 8th edition ID:24.2.4.1

24 : ANHYDROUS BORATES
2 : A2BO2[XO3]
Hey's CIM Ref.:9.7.1

9 : Borates
7 : Borates of Mn
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Type Occurrence of Pinakiolite

Type Locality:Långban, Filipstad, Värmland, Sweden
General Appearance of Type Material:Bands in matrix.
Year of Discovery:1890
Geological Setting of type material:Bands in granular dolomite.
Associated Minerals at type locality:
TephroiteHendricksiteHausmanniteDolomiteBerzeliite

Physical Properties of Pinakiolite

Lustre:Metallic
Diaphaneity (Transparency):Opaque
Colour:Black; deep reddish brown in transmitted light
Streak:Brown-gray
Hardness (Mohs):6
Tenacity:Very brittle
Cleavage:Distinct/Good
On {010}.
Density (measured):3.88 g/cm3

Crystallography of Pinakiolite

Crystal System:Monoclinic
Cell Parameters:a = 5.36Å, b = 5.98Å, c = 12.73Å
β = 120.57°
Ratio:a:b:c = 0.896 : 1 : 2.129
Unit Cell Volume:V 351.32 ų (Calculated from Unit Cell)
Morphology:Thin rectangular tablets {010}. Short prismatic [001], rare. Crystals often bent or broken.
Twinning:On {011} common as contact and/or cruciform interpenetrant twins.

Optical Data of Pinakiolite

Type:Biaxial (-)
RI values: nα = 1.908 nβ = 2.050 nγ = 2.650
2V:Measured: 31° to 33°, Calculated: 64°
Maximum Birefringence:δ = 0.742

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Dispersion:r < v
Pleochroism:Visible
Comments:X = Deep reddish brown
Y = Nearly opaque
Z = Reddish yellow

Chemical Properties of Pinakiolite

Formula:
(Mg,Mn
2+
 
)
 
2
Mn
3+
 
[O
 
2
|BO
 
3
]
Essential elements:B, Mg, Mn, O
All elements listed in formula:B, Mg, Mn, O

Relationship of Pinakiolite to other Species

Related Minerals - Nickel-Strunz Grouping):
6.AB.05Hambergite
Be
 
2
[O|OH|BO
 
2
]
6.AB.10Berborite
Be
 
2
[(OH,F)|BO
 
3
] · H
 
2
O
6.AB.15Jeremejevite
Al
 
6
[(F,OH)
 
3
|(BO
 
3
)
 
5
]
6.AB.20Warwickite
(Mg,Fe
2+
 
)
 
3
Ti[O|BO
 
3
]
 
2
6.AB.20Yuanfuliite
Mg(Fe
3+
 
,Fe
2+
 
,Al,Ti,Mg)[O|BO
 
3
]
6.AB.25Karlite
Mg
 
7
[(OH,Cl)
 
5
|(BO
 
3
)
 
3
]
6.AB.30Azoproite
(Mg,Fe
2+
 
)
 
2
(Fe
3+
 
,Ti,Mg)[O
 
2
|BO
 
3
]
6.AB.30Bonaccordite
Ni
 
2
Fe
3+
 
[O
 
2
|BO
 
3
]
6.AB.30Fredrikssonite
Mg
 
2
(Mn
3+
 
,Fe
3+
 
)[O
 
2
|BO
 
3
]
6.AB.30Ludwigite
Mg
 
2
Fe
3+
 
[O
 
2
|BO
 
3
]
6.AB.30Vonsenite
Fe
2+
2
Fe
3+
 
[O
 
2
|BO
 
3
]
6.AB.40Blatterite
(Mn
2+
 
,Mg)
 
2
(Mn
3+
 
,Sb
3+
 
,Fe
3+
 
)[O
 
2
|BO
 
3
]
6.AB.40Chestermanite
Mg
 
2
(Fe
3+
 
,Mn
3+
 
,Al,Sb
3+
 
)[O
 
2
|BO
 
3
]
6.AB.40Orthopinakiolite
(Mg,Mn
2+
 
)
 
2
Mn
3+
 
[O
 
2
|BO
 
3
]
6.AB.40Takéuchiite
(Mg,Mn
2+
 
)
 
2
(Mn
3+
 
,Fe
3+
 
)[O
 
2
|BO
 
3
]
6.AB.45Hulsite
(Fe
2+
 
,Mg)
 
2
(Fe
3+
 
,Sn)[O
 
2
|BO
 
3
]
6.AB.45Magnesiohulsite
(Mg,Fe
2+
 
)
 
2
(Fe
3+
 
,Sn,Mg)[O
 
2
|BO
 
3
]
6.AB.45Aluminomagnesiohulsite
(Mg,Fe
2+
 
)
 
2
(Al,Mg,Sn)[O
 
2
|BO
 
3
]
6.AB.50Fluoborite
Mg
 
3
[(F,OH)
 
3
|BO
 
3
]
6.AB.50Hydroxylborite
Mg
 
3
(BO
 
3
)(OH)
 
3
6.AB.55Shabynite
Mg
 
5
[(Cl,OH)
 
2
|(OH)
 
5
|BO
 
3
] · 4H
 
2
O
6.AB.55Wightmanite
Mg
 
5
[O|(OH)
 
5
|BO
 
3
] · 2H
 
2
O
6.AB.60Gaudefroyite
Ca
 
4
Mn
3+
2-3
[(O,OH)
 
3
|CO
 
3
|(BO
 
3
)
 
3
]
6.AB.65Sakhaite
Ca
 
12
Mg
 
4
[Cl|(OH)
 
2
|(CO
 
3
)
 
4
|(BO
 
3
)
 
7
]
6.AB.70Harkerite
Ca
 
24
Mg
 
8
Al
 
2
Si
 
8
(O,OH)
 
32
(BO
 
3
)
 
8
(CO
 
3
)
 
8
(H
 
2
O,Cl)
6.AB.75Pertsevite
Mg
 
2
BO
 
3
F
6.AB.80Jacquesdietrichite
Cu
 
2
BO(OH)
 
2
(OH)
 
3
6.AB.85Painite
ZrCaAl
 
9
[O
 
15
|BO
 
3
]
Related Minerals - Hey's Index Grouping:
9.7.2Orthopinakiolite
(Mg,Mn
2+
 
)
 
2
Mn
3+
 
[O
 
2
|BO
 
3
]
9.7.3Jimboite
(Mn
2+
 
,Mg)
 
3
[BO
 
3
]
 
2
9.7.4Sussexite
(Mn
2+
 
,Mg)
 
2
[B
 
2
O
 
5
] · H
 
2
O
9.7.5Wiserite
(Mn,Mg)
 
14
[Cl|(OH)
 
8
|(Si,Mg)(O,OH)
 
4
|(B
 
2
O
 
5
)
 
4
]
9.7.6Kurchatovite
Ca(Mg,Mn
2+
 
)[B
 
2
O
 
5
]
9.7.7Clinokurchatovite
Ca(Mg,Fe
2+
 
,Mn
2+
 
)[B
 
2
O
 
5
]
9.7.8Takéuchiite
(Mg,Mn
2+
 
)
 
2
(Mn
3+
 
,Fe
3+
 
)[O
 
2
|BO
 
3
]
9.7.9Blatterite
(Mn
2+
 
,Mg)
 
2
(Mn
3+
 
,Sb
3+
 
,Fe
3+
 
)[O
 
2
|BO
 
3
]
9.7.10Tusionite
Mn
2+
 
Sn
4+
 
[BO
 
3
]
 
2

Other Names for Pinakiolite

Synonyms:
Pinakiolith
German names:
Pinakiolit
Russian names:
Пинакиолит
Spanish names:
Pinakiolita

Other Information

Other Information:Soluble in concentrated HCl with the evolution of elemental chlorine.
Health Warning:Emits poisonous chlorine gas when contacted by concentrated HCl.

References for Pinakiolite

Reference List:Flink (1890) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 18: 361 (as Pinakiolith).

Bäckström (1895) Geologiska Föeningens I Stockholm. Förhandlinger, Stockholm: 17: 257.

Larsen, E.S. (1921) The Microscopic Determination of the Nonopaque Minerals, First edition, USGS Bulletin 679: 120.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 324-325.

American Mineralogist (1974): 59: 985-1004.

American Mineralogist (1986): 71: 227.

Zeitschrift für Kristallographie: 191: 105-116.

Acta Crystallographica: 3: 98-107.

Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

Nysten, P., Holtstam, D. and Jonsson, E. (1999) The Långban minerals. In Långban - The mines,their minerals, geology and explorers (D. Holtstam and J. Langhof, eds.), Swedish Museum of Natural History and Raster Förlag, Stockholm & Chr. Weise Verlag, Munich, pp. 89-183.

Internet Links for Pinakiolite

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    Localities for Pinakiolite

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    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.
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    (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.
    Sweden
     
    • Värmland
      • Filipstad
    		Zeits.Krist.Min.(1890) 18, 361-365; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 325; Nysten, P., Holtstam, D. and Jonsson, E. (1999) The Långban minerals. In Långban - The mines,their minerals, geology and explorers (D. Holtstam and J. Langhof, eds.), Swedish Museum of Natural History and Raster Förlag, Stockholm & Chr. Weise Verlag, Munich, pp. 89-183.
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