Pinakiolite (original) (raw)
A valid IMA mineral species - grandfathered
About PinakioliteHide
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Formula:
(Mg,Mn2+)2Mn3+(BO3)O2
Colour:
Black; deep reddish brown in transmitted light
Crystal System:
Monoclinic
Name:
From the Greek πινάκιον, a small tablet, and λίθος, stone, in allusion to the thin tabular shape of the crystals.
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:3214:4
IMA Classification of PinakioliteHide
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Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
(Mg,Mn)2(Mn3+,Sb5+)O2(BO3)
Type description reference:
Classification of PinakioliteHide
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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
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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Pki | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of PinakioliteHide
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Transparency:
Translucent, Opaque
Comment:
brilliant on {010}, to pearly
Colour:
Black; deep reddish brown in transmitted light
Cleavage:
Distinct/Good
On {010}.
Density:
3.88 g/cm3 (Measured) 3.94(15) g/cm3 (Calculated)
Optical Data of PinakioliteHide
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RI values:
_n_α = 1.908(5) _n_β = 2.050(1) _n_γ = 2.060(10)
2V:
Measured: 31° to 33°, Calculated: 64°
δ = 0.152
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Optical Extinction:
X = b; Y = c; Z = a.
Comments:
X = Deep reddish brown
Y = Nearly opaque
Z = Reddish yellow
Chemistry of PinakioliteHide
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Mindat Formula:
(Mg,Mn2+)2Mn3+(BO3)O2
Crystallography of PinakioliteHide
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Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
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)
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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| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0000416 | Pinakiolite | Moore 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 59 985-1004 |  |
1974 | Langban, Sweden | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder DiffractionHide
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 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
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Type Occurrence of PinakioliteHide
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General Appearance of Type Material:
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:
Synonyms of PinakioliteHide
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Other Language Names for PinakioliteHide
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Varieties of PinakioliteHide
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| Sb-rich pinakiolite | Described 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
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Other Members of Pinakiolite Group:
Common AssociatesHide
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Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
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| 6.AB. | Chubarovite | KZn2(BO3)Cl2 | Trig. 32 : _R_32 |
|---|---|---|---|
| 6.AB. | Rhabdoborite-(Mo) | Mg12Mo6+1.33O6(BO3)6F2 | Hex. 6 : _P_63 |
| 6.AB.05 | Hambergite | Be2(BO3)(OH) | Orth. m m m _(_2/_m_2/_m_2/m ) : P b c a |
| 6.AB.10 | Berborite | Be2(BO3)(OH,F) · H2O | Trig. |
| 6.AB.15 | Jeremejevite | Al6(BO3)5(F,OH)3 | Hex. 6/m : _P_63/m |
| 6.AB.20 | Yuanfuliite | Mg(Fe3+,Al)O(BO3) | Orth. m m m _(_2/_m_2/_m_2/m ) : P n m a |
| 6.AB.20 | Warwickite | (Mg,Ti,Fe,Al)2O(BO3) | Orth. m m m _(_2/_m_2/_m_2/m ) : P n m a |
| 6.AB.25 | Karlite | (Mg,Al)6.5(BO3)3(OH)4(◻,Cl)0.5 | Orth. 222 : _P_21212 |
| 6.AB.30 | Marinaite | Cu2Fe3+O2(BO3) | Mon. 2/m : _P_21/b |
| 6.AB.30 | Savelievaite | Mg2Cr3+O2(BO3) | Orth. m m m _(_2/_m_2/_m_2/m ) : P b a m |
| 6.AB.30 | Fredrikssonite | Mg2(Mn3+,Fe3+)(BO3)O2 | Orth. m m m _(_2/_m_2/_m_2/m ) : P b a m |
| 6.AB.30 | Vonsenite | Fe2+2Fe3+(BO3)O2 | Orth. m m m _(_2/_m_2/_m_2/m ) : P b a m |
| 6.AB.30 | Ludwigite | Mg2Fe3+(BO3)O2 | Orth. m m m _(_2/_m_2/_m_2/m ) : P b a m |
| 6.AB.30 | Azoproite | (Mg,Fe2+)2(Fe3+,Ti,Mg)(BO3)O2 | Orth. m m m _(_2/_m_2/_m_2/m ) : P b a m |
| 6.AB.30 | Bonaccordite | Ni2Fe3+(BO3)O2 | Orth. m m m _(_2/_m_2/_m_2/m ) : P b a m |
| 6.AB.35 | Folvikite | Sb5+Mn3+(Mg,Mn2+)10O8(BO3)4 | Mon. 2 : _P_2 |
| 6.AB.40 | Takéuchiite | (Mg,Mn2+)2(Mn3+,Fe3+)(BO3)O2 | Orth. m m m _(_2/_m_2/_m_2/m ) : P n n m |
| 6.AB.40 | Blatterite | Sb5+3(Mn3+,Fe3+)9(Mn2+,Mg)35(BO3)16O32 | Orth. m m m _(_2/_m_2/_m_2/m ) : P n n m |
| 6.AB.40 | Orthopinakiolite | (Mg,Mn2+)2Mn3+(BO3)O2 | Orth. m m m _(_2/_m_2/_m_2/m ) : P n n m |
| 6.AB.40 | Chestermanite | Mg2(Fe3+,Mn3+,Al,Sb3+)(BO3)O2 | Orth. m m m _(_2/_m_2/_m_2/m ) |
| 6.AB.45 | Aluminomagnesiohulsite | (Mg,Fe2+)2(Al,Mg,Sn)(BO3)O2 | Mon. 2/m : _P_2/m |
| 6.AB.45 | Hulsite | (Fe2+,Mg)2(Fe3+,Sn)(BO3)O2 | Mon. 2/m : _P_2/m |
| 6.AB.45 | Magnesiohulsite | (Mg,Fe2+)2(Fe3+,Sn,Mg)(BO3)O2 | Mon. 2/m : _P_2/m |
| 6.AB.50 | Fluoborite | Mg3(BO3)(F,OH)3 | Hex. 6/m : _P_63/m |
| 6.AB.50 | Hydroxylborite | Mg3(BO3)(OH)3 | Hex. 6/m : _P_63/m |
| 6.AB.55 | Shabynite | Mg5(BO3)(OH)5(Cl,OH)2 · 4H2O | Mon. |
| 6.AB.55 | Wightmanite | Mg5(BO3)O(OH)5 · 2H2O | Mon. 2/m |
| 6.AB.60 | Gaudefroyite | Ca4Mn3+2-3(BO3)3(CO3)(O,OH)3 | Hex. |
| 6.AB.65 | Sakhaite | Ca48Mg16(BO3)32(CO3)16 · 2(H2O,HCl) | Iso. m_3_m _(_4/_m_32/m ) : F d_3_m |
| 6.AB.70 | Harkerite | Ca48Mg16[AlSi4O15(OH)]4(BO3)16(CO3)16 · 2(H2O,HCl) | Trig. 3_m_ _(_32/m ) : R_3_m |
| 6.AB.75 | Pertsevite-(F) | Mg2(BO3)(F,OH) | Orth. m _m_2 : P n _a_21 |
| 6.AB.75 | Pertsevite-(OH) | Mg2(BO3)(OH) | Orth. m m m _(_2/_m_2/_m_2/m ) : P n m a |
| 6.AB.80 | Jacquesdietrichite | Cu2(H2BO3)(OH)3 | Orth. m m m _(_2/_m_2/_m_2/m ) : P m n a |
| 6.AB.85 | Rhabdoborite-(V) | Mg12(V5+,Mo6+,W6+)1.5O6{[BO3]6-x[(P,As)O4]xF2-x} (x < 1) | Hex. 6 : _P_63 |
| 6.AB.85 | Rhabdoborite-(W) | Mg12(W6+,V5+)1.5O6{[BO3]6-x[(P,As)O4]xF2-x} | Hex. 6 : _P_63 |
| 6.AB.85 | Painite | CaZrAl9(BO3)O15 | Hex. 6/m : _P_63/m |
| 6.AB.90 | Mengxianminite | (Ca,Na)2Sn2(Mg,Fe)3Al8[(BO3)(BeO4)O6]2 | Orth. m _m_2 : F d _d_2 |
Other InformationHide
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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
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References for PinakioliteHide
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Reference List:
Dunn, Pete J., Chao, George Y., Fitzpatrick, Joan J., Langley, Richard H., Fleischer, Michael, Zilczer, Janet A. (1986) New Mineral Names. American Mineralogist, 71 (1-2). 227-232
Localities for PinakioliteHide
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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
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