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Pinakiolite

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Formula:
(Mg,Mn2+)2Mn3+(BO3)O2
Colour:
Black; deep reddish brown in transmitted light
Lustre:
Metallic
Hardness:
6
Specific Gravity:
3.88
Crystal System:
Monoclinic
Name:
From the Greek πινάκιον, a small tablet, and λίθος, stone, in allusion to the thin tabular shape of the crystals.
Dimorph of:
The monoclinic dimorph of Orthopinakiolite.


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Classification of PinakioliteHide

Approved, 'Grandfathered' (first described prior to 1959)
6.AB.35

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

24 : ANHYDROUS BORATES
2 : A2BO2[XO3]
9.7.1

9 : Borates
7 : Borates of Mn

Physical Properties of PinakioliteHide

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

Optical Data of PinakioliteHide

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

Formula:
(Mg,Mn2+)2Mn3+(BO3)O2
IMA Formula:
(Mg,Mn2+)2(Mn3+,Sb5+)O2(BO3)

Crystallography of PinakioliteHide

Crystal System:
Monoclinic
Cell Parameters:
a = 5.36 Å, b = 5.98 Å, c = 12.73 Å
β = 120.57°
Ratio:
a:b:c = 0.896 : 1 : 2.129
Unit Cell 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.

Type Occurrence of PinakioliteHide

General Appearance of Type Material:
Bands in matrix.
Geological Setting of Type Material:
Bands in granular dolomite.
Associated Minerals at Type Locality:

Synonyms of PinakioliteHide

Other Language Names for PinakioliteHide

Varieties of PinakioliteHide

Sb-rich pinakioliteDescribed by Hansen et al. (1988) and Norrestam & Hansen (1990) as a Sb-bearing pinakiolite, a new structural variety from Långban, Sweden.

Relationship of Pinakiolite to other SpeciesHide

Other Members of this group:
Aluminomagnesiohulsite(Mg,Fe2+)2(Al,Mg,Sn)(BO3)O2Mon. 2/m
FolvikiteSb5+Mn3+(Mg,Mn2+)10O8(BO3)4Mon. 2 : P2
Hulsite(Fe2+,Mg)2(Fe3+,Sn)(BO3)O2Mon.
Magnesiohulsite(Mg,Fe2+)2(Fe3+,Sn,Mg)(BO3)O2Mon.

Common AssociatesHide

Associated Minerals Based on Photo Data:
Hausmannite1 photo of Pinakiolite associated with Hausmannite on mindat.org.
Molybdophyllite1 photo of Pinakiolite associated with Molybdophyllite on mindat.org.
Berzeliite1 photo of Pinakiolite associated with Berzeliite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

6.AB.05HambergiteBe2(BO3)(OH)Orth. mmm (2/m 2/m 2/m) : Pbca
6.AB.10BerboriteBe2(BO3)(OH,F) · H2OTrig.
6.AB.15JeremejeviteAl6(BO3)5(F,OH)3Hex. 6/m : P63/m
6.AB.20Warwickite(Mg,Ti,Fe,Cr,Al)2O(BO3)Orth.
6.AB.20YuanfuliiteMg(Fe3+,Al)O(BO3)Orth.
6.AB.25KarliteMg7(BO3)3(OH,Cl)5Orth.
6.AB.30Azoproite(Mg,Fe2+)2(Fe3+,Ti,Mg)(BO3)O2Orth.
6.AB.30BonaccorditeNi2Fe3+(BO3)O2Orth.
6.AB.30FredrikssoniteMg2(Mn3+,Fe3+)(BO3)O2Orth.
6.AB.30LudwigiteMg2Fe3+(BO3)O2Orth.
6.AB.30VonseniteFe2+2Fe3+(BO3)O2Orth.
6.AB.40BlatteriteSb5+(Mn3+,Fe3+)9(Mn2+,Mg)35(BO3)16O32Orth. mmm (2/m 2/m 2/m) : Pnnm
6.AB.40ChestermaniteMg2(Fe3+,Mn3+,Al,Sb3+)(BO3)O2Orth.
6.AB.40Orthopinakiolite(Mg,Mn2+)2Mn3+(BO3)O2Orth.
6.AB.40Takéuchiite(Mg,Mn2+)2(Mn3+,Fe3+)(BO3)O2Orth.
6.AB.45Hulsite(Fe2+,Mg)2(Fe3+,Sn)(BO3)O2Mon.
6.AB.45Magnesiohulsite(Mg,Fe2+)2(Fe3+,Sn,Mg)(BO3)O2Mon.
6.AB.45Aluminomagnesiohulsite(Mg,Fe2+)2(Al,Mg,Sn)(BO3)O2Mon. 2/m
6.AB.50FluoboriteMg3(BO3)(F,OH)3Hex.
6.AB.50HydroxylboriteMg3(BO3)(OH)3Hex. 6/m : P63/m
6.AB.55ShabyniteMg5(BO3)(OH)5(Cl,OH)2 · 4H2OMon.
6.AB.55WightmaniteMg5(BO3)O(OH)5 · 2H2OMon.
6.AB.60GaudefroyiteCa4Mn3+2-3(BO3)3(CO3)(O,OH)3Hex.
6.AB.65SakhaiteCa12Mg4(BO3)7(CO3)4(OH)2ClIso. m3m (4/m 3 2/m) : Fd3m
6.AB.70HarkeriteCa12Mg4Al(BO3)3(SiO4)4(CO3)5 · H2OTrig. 3m (3 2/m) : R3m
6.AB.75Pertsevite-(F)Mg2(BO3)(F,OH)Orth. mm2 : Pna21
6.AB.75Pertsevite-(OH)Mg2(BO3)(OH)Orth. mmm (2/m 2/m 2/m) : Pnma
6.AB.80JacquesdietrichiteCu2(H2BO3)(OH)3Orth. mmm (2/m 2/m 2/m) : Pmna
6.AB.85PainiteCaZrAl9(BO3)O15Hex.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

9.7.2Orthopinakiolite(Mg,Mn2+)2Mn3+(BO3)O2Orth.
9.7.3Jimboite(Mn2+,Mg)3[BO3]2Orth.
9.7.4SussexiteMn2+BO2(OH)Orth. 2 2 2 : P21 21 2
9.7.5Wiserite(Mn,Mg)14[Cl|(OH)8|(Si,Mg)(O,OH)4|(B2O5)4]Tet.
9.7.6KurchatoviteCa(Mg,Mn2+)[B2O5]Orth.
9.7.7ClinokurchatoviteCa(Mg,Fe2+,Mn2+)[B2O5]Mon.
9.7.8Takéuchiite(Mg,Mn2+)2(Mn3+,Fe3+)(BO3)O2Orth.
9.7.9BlatteriteSb5+(Mn3+,Fe3+)9(Mn2+,Mg)35(BO3)16O32Orth. mmm (2/m 2/m 2/m) : Pnnm
9.7.10TusioniteMn2+Sn4+[BO3]2Trig. 3 : R3

Other InformationHide

Notes:
Soluble in concentrated HCl with the evolution of elemental chlorine.
Health Risks:
Emits poisonous chlorine gas when contacted by concentrated HCl.

References for PinakioliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Flink (1890) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 18: 361 (as Pinakiolith).
Bäckström (1895) Ett pinakiolit närstående mineral från Långban. Geologiska Föreningens i Stockholm Förhandlinger: 17: 257-259.
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 PinakioliteHide

Localities for PinakioliteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Canada
 
  • Nova Scotia
    • Lunenburg Co.
      • New Ross
D.G. Bishop and J.D. Wright, "Geology and Trace Element Studies of Manganese Occurrences in Nova Scotia", N.S. Dept. of Mines, Economic Geology Series 74-1, 1974.
Romania
 
  • Caraş-Severin Co.
    • Banat Mts
      • Ocna de Fier-Dognecea District
http://minerals-of-the-carpathians.eu
Sweden (TL)
 
  • 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.
Mineral and/or Locality  
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