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Pinakiolite

A valid IMA mineral species - grandfathered
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About PinakioliteHide

Formula:
(Mg,Mn2+)2Mn3+(BO3)O2
Colour:
Black; deep reddish brown in transmitted light
Lustre:
Pearly, 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.


Unique IdentifiersHide

Mindat ID:
3214
Long-form identifier:
mindat:1:1:3214:4
GUID
(UUID V4):
32668e80-0cdb-4d6a-b677-d976a6c7d194

IMA Classification of PinakioliteHide

Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
(Mg,Mn)2(Mn3+,Sb5+)O2(BO3)
First published:
1891

Classification of PinakioliteHide

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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
PkiIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of PinakioliteHide

Pearly, Metallic
Transparency:
Translucent, Opaque
Comment:
brilliant on {010}, to pearly
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)    3.94(15) g/cm3 (Calculated)

Optical Data of PinakioliteHide

Type:
Biaxial (-)
RI values:
nα = 1.908(5) nβ = 2.050(1) nγ = 2.060(10)
2V:
Measured: 31° to 33°, Calculated: 64°
Max Birefringence:
δ = 0.152
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
r < v
Optical Extinction:
X = b; Y = c; Z = a.
Pleochroism:
Visible
Comments:
X = Deep reddish brown
Y = Nearly opaque
Z = Reddish yellow

Chemistry of PinakioliteHide

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

Crystallography of PinakioliteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 5.36 Å, b = 5.98 Å, c = 21.79 Å
β = 120.57°
Ratio:
a:b:c = 0.896 : 1 : 3.644
Unit Cell V:
601.35 ų (Calculated from Unit Cell)
Z:
8
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.

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0000416PinakioliteMoore P B, Araki T (1974) Pinakiolite, Mg2MnO2[BO3]; warwickite, Mg(Mg0.5Ti0.5)O[BO3]; wightmanite, Mg5(O)(OH)5[BO3].nH2O: Crystal chemistry of complex 3 Angstrom wallpaper structures American Mineralogist 59 985-10041974Langban, Sweden0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.51 Å(10)
2.70 Å(9)
5.42 Å(8)
1.986 Å(6)
2.165 Å(4)
1.623 Å(4)
1.496 Å(4)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Near-surface Processes
23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47)
High-𝑇 alteration and/or metamorphism
32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits

Type Occurrence of PinakioliteHide

General Appearance of Type Material:
Bands in matrix.
Place of Conservation of Type Material:
Swedish Museum of Natural History, Stockholm, Sweden, 531826.
Geological Setting of Type Material:
Bands in granular dolomite.
Associated Minerals at Type Locality:
Reference:
Flink, G. (1891) Ueber Pinakiolith und Trimerit, zwei neue Mineralien aus den Mangangruben Schwedens. Zeitschrift für Kristallographie: 18: 361-376.

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 : P2/m
FolvikiteSb5+Mn3+(Mg,Mn2+)10O8(BO3)4Mon. 2 : P2
Hulsite(Fe2+,Mg)2(Fe3+,Sn)(BO3)O2Mon. 2/m : P2/m
Magnesiohulsite(Mg,Fe2+)2(Fe3+,Sn,Mg)(BO3)O2Mon. 2/m : P2/m

Common AssociatesHide

Associated Minerals Based on Photo Data:
7 photos of Pinakiolite associated with CalciteCaCO3
6 photos of Pinakiolite associated with DolomiteCaMg(CO3)2
1 photo of Pinakiolite associated with MolybdophyllitePb8Mg9[Si10O28(OH)8O2(CO3)3] · H2O
1 photo of Pinakiolite associated with Berzeliite(NaCa2)Mg2(AsO4)3

Related Minerals - Strunz-mindat GroupingHide

6.AB.Rhabdoborite-(Mo)Mg12Mo6+1.33O6(BO3)6F2Hex. 6 : P63
6.AB.ChubaroviteKZn2(BO3)Cl2Trig. 3 2 : R3 2
6.AB.SavelievaiteMg2Cr3+O2(BO3)Orth. mmm (2/m 2/m 2/m) : Pbam
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,Al)2O(BO3)Orth. mmm (2/m 2/m 2/m) : Pnma
6.AB.20YuanfuliiteMg(Fe3+,Al)O(BO3)Orth. mmm (2/m 2/m 2/m) : Pnma
6.AB.25Karlite(Mg,Al)6.5(BO3)3(OH)4(◻,Cl)0.5Orth. 2 2 2 : P21 21 2
6.AB.30Azoproite(Mg,Fe2+)2(Fe3+,Ti,Mg)(BO3)O2Orth. mmm (2/m 2/m 2/m) : Pbam
6.AB.30BonaccorditeNi2Fe3+(BO3)O2Orth. mmm (2/m 2/m 2/m) : Pbam
6.AB.30FredrikssoniteMg2(Mn3+,Fe3+)(BO3)O2Orth. mmm (2/m 2/m 2/m) : Pbam
6.AB.30LudwigiteMg2Fe3+(BO3)O2Orth. mmm (2/m 2/m 2/m) : Pbam
6.AB.30VonseniteFe2+2Fe3+(BO3)O2Orth. mmm (2/m 2/m 2/m) : Pbam
6.AB.30MarinaiteCu2Fe3+O2(BO3)Mon. 2/m : P21/b
6.AB.35FolvikiteSb5+Mn3+(Mg,Mn2+)10O8(BO3)4Mon. 2 : P2
6.AB.40BlatteriteSb5+3(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. mmm (2/m 2/m 2/m)
6.AB.40Orthopinakiolite(Mg,Mn2+)2Mn3+(BO3)O2Orth. mmm (2/m 2/m 2/m) : Pnnm
6.AB.40Takéuchiite(Mg,Mn2+)2(Mn3+,Fe3+)(BO3)O2Orth. mmm (2/m 2/m 2/m) : Pnnm
6.AB.45Hulsite(Fe2+,Mg)2(Fe3+,Sn)(BO3)O2Mon. 2/m : P2/m
6.AB.45Magnesiohulsite(Mg,Fe2+)2(Fe3+,Sn,Mg)(BO3)O2Mon. 2/m : P2/m
6.AB.45Aluminomagnesiohulsite(Mg,Fe2+)2(Al,Mg,Sn)(BO3)O2Mon. 2/m : P2/m
6.AB.50FluoboriteMg3(BO3)(F,OH)3Hex. 6/m : P63/m
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. 2/m
6.AB.60GaudefroyiteCa4Mn3+2-3(BO3)3(CO3)(O,OH)3Hex.
6.AB.65SakhaiteCa48Mg16(BO3)32(CO3)16 · 2(H2O,HCl)Iso. m3m (4/m 3 2/m) : Fd3m
6.AB.70HarkeriteCa48Mg16[AlSi4O15(OH)]4(BO3)16(CO3)16 · 2(H2O,HCl)Trig. 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. 6/m : P63/m
6.AB.85Rhabdoborite-(V)Mg12(V5+,Mo6+,W6+)1.5O6{[BO3]6-x[(P,As)O4]xF2-x} (x < 1)Hex. 6 : P63
6.AB.85Rhabdoborite-(W)Mg12(W6+,V5+)1.5O6{[BO3]6-x[(P,As)O4]xF2-x} Hex. 6 : P63
6.AB.90Mengxianminite(Ca,Na)2Sn2(Mg,Fe)3Al8[(BO3)(BeO4)O6]2Orth. mm2 : Fdd2

Other InformationHide

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

Internet Links for PinakioliteHide

References for PinakioliteHide

Reference List:

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 references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Canada
 
  • Nova Scotia
    • Lunenburg Co.
      • New Ross
Bishop et al. (1974)
Romania
 
  • Caraş-Severin County
minerals-of-the-carpathians.eu (2008)
Sweden (TL)
 
  • Värmland County
    • Filipstad
      • Långban Ore District
Zeits.Krist.Min. (1890) +2 other references
Grensman (2003)
www.johnbetts-fineminerals.com (2022) +1 other reference
 
矿物 and/or 产地  
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