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Harkerite

A valid IMA mineral species
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Ca48Mg16[AlSi4O15(OH)]4(BO3)16(CO3)16 · 2(H2O,HCl)
Formerly given asCa12Mg4Al(BO3)3(SiO4)4(CO3)5 · H2O

Evans et al. (2018) report the formula as ~Ca48Mg16[AlSi4(O,OH)16]4(BO3)16(CO3)16(HCl,H2O)2

Finally redefined to the formula given above.
Colour:
White; also tannish brown
Lustre:
Sub-Vitreous, Waxy, Dull
Specific Gravity:
2.96
Crystal System:
Trigonal
Name:
Named in 1948 by Cecil Edgar Tilley for systematic petrologist Alfred Harker (19 February 1859, Hull, Yorkshire, UK - 28 July 1939) of the Scottish Geological Survey.
Type Locality:
ⓘCamas Malag, Torrin, Broadford, Isle of Skye, Eilean á Chèo, Highland, Scotland, UK
White to tannish brown pseudo-octahedral crystals.

Structurally related tosakhaite with which it forms a solid solution (Sakhaite-Harkerite solid solution).

CompareUM1990-59-SiO:AlBCHMg.

Seems to be (in particular) a hydrochloride (chlorhydrate).



Unique Identifiers
IMA status notes:
Redefined by the IMA
First published:
1951
Approval history:
Final redefinitions due to data from the Newsletter #60 (Miyawaki et al. 2021).
Type description reference:
Tilley, C. E. (1951) The zoned contact-skarns of the Broadford area, Skye: a study of boron-fluorine metasomatism in dolomites.Mineralogical Magazine and Journal of the Mineralogical Society, 29 (214) 621-666doi:10.1180/minmag.1951.029.214.01

Classification of Harkerite

6 : BORATES
A : Monoborates
B : BO3, with additional anions; 1(D) + OH, etc.
Dana 8th ed.:
17.1.9.1

17 : COMPOUND CARBONATES
1 : Miscellaneous
Hey's CIM Ref.:
17.5.16

17 : Silicates Containing other Anions
5 : Borosilicates

Mineral Symbols
Transparency:
Translucent
Colour:
White; also tannish brown
Streak:
White
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
2.96 g/cm3 (Measured)    3.00 g/cm3 (Calculated)

Optical Data of Harkerite
Surface Relief:
Moderate
Optical Extinction:
May be anomalously biaxial
Pleochroism:
Non-pleochroic

Chemistry of Harkerite
Common Impurities:
TR,Ce,Fe,Mn,Sr,F,Cl

Crystallography of Harkerite
General Appearance of Type Material:
Simple pseudo-octahedrons. Sometimes altered to calcite.
Place of Conservation of Type Material:
n.d.
Geological Setting of Type Material:
Skarn.
Associated Minerals at Type Locality:
BorniteCalciteDiopsideDolomiteMagnetite
Monticellite
Reference:
Tilley, C. E. (1951) The zoned contact-skarns of the Broadford area, Skye: a study of boron-fluorine metasomatism in dolomites.Mineralogical Magazine and Journal of the Mineralogical Society, 29 (214) 621-666doi:10.1180/minmag.1951.029.214.01

Other Language Names for Harkerite

Relationship of Harkerite to other Species

Common AssociatesTrig. 32 :R326.AB.Rhabdoborite-(Mo)Mg12Mo6+1.33O6(BO3)6F2Hex. 6 :P636.AB.05HambergiteBe2(BO3)(OH)Orth.mmm(2/m2/m2/m) :Pbca6.AB.10BerboriteBe2(BO3)(OH,F) · H2OTrig.6.AB.15JeremejeviteAl6(BO3)5(F,OH)3Hex. 6/m :P63/m6.AB.20YuanfuliiteMg(Fe3+,Al)O(BO3)Orth.mmm(2/m2/m2/m) :Pnma6.AB.20Warwickite(Mg,Ti,Fe,Al)2O(BO3)Orth.mmm(2/m2/m2/m) :Pnma6.AB.25Karlite(Mg,Al)6.5(BO3)3(OH)4(◻,Cl)0.5Orth. 222 :P212126.AB.30MarinaiteCu2Fe3+O2(BO3)Mon. 2/m :P21/b6.AB.30SavelievaiteMg2Cr3+O2(BO3)Orth.mmm(2/m2/m2/m) :Pbam6.AB.30FredrikssoniteMg2(Mn3+,Fe3+)(BO3)O2Orth.mmm(2/m2/m2/m) :Pbam6.AB.30VonseniteFe2+2Fe3+(BO3)O2Orth.mmm(2/m2/m2/m) :Pbam6.AB.30LudwigiteMg2Fe3+(BO3)O2Orth.mmm(2/m2/m2/m) :Pbam6.AB.30Azoproite(Mg,Fe2+)2(Fe3+,Ti,Mg)(BO3)O2Orth.mmm(2/m2/m2/m) :Pbam6.AB.30BonaccorditeNi2Fe3+(BO3)O2Orth.mmm(2/m2/m2/m) :Pbam6.AB.35FolvikiteSb5+Mn3+(Mg,Mn2+)10O8(BO3)4Mon. 2 :P26.AB.35Pinakiolite(Mg,Mn2+)2Mn3+(BO3)O2Mon. 2/m :B2/m6.AB.40Takéuchiite(Mg,Mn2+)2(Mn3+,Fe3+)(BO3)O2Orth.mmm(2/m2/m2/m) :Pnnm6.AB.40BlatteriteSb5+3(Mn3+,Fe3+)9(Mn2+,Mg)35(BO3)16O32Orth.mmm(2/m2/m2/m) :Pnnm6.AB.40Orthopinakiolite(Mg,Mn2+)2Mn3+(BO3)O2Orth.mmm(2/m2/m2/m) :Pnnm6.AB.40ChestermaniteMg2(Fe3+,Mn3+,Al,Sb3+)(BO3)O2Orth.mmm(2/m2/m2/m)6.AB.45Aluminomagnesiohulsite(Mg,Fe2+)2(Al,Mg,Sn)(BO3)O2Mon. 2/m :P2/m6.AB.45HulsiteFe2+2Fe3+O2(BO3)Mon. 2/m :P2/m6.AB.45MagnesiohulsiteMg2Fe3+O2(BO3)Mon. 2/m :P2/m6.AB.50FluoboriteMg3(BO3)(F,OH)3Hex. 6/m :P63/m6.AB.50HydroxylboriteMg3(BO3)(OH)3Hex. 6/m :P63/m6.AB.55ShabyniteMg5(BO3)(OH)5(Cl,OH)2 · 4H2OMon.6.AB.55WightmaniteMg5(BO3)O(OH)5 · 2H2OMon. 2/m6.AB.60GaudefroyiteCa4Mn3+2-3(BO3)3(CO3)(O,OH)3Hex.6.AB.65SakhaiteCa48Mg16(BO3)32(CO3)16 · 2(H2O,HCl)Iso.m3m(4/m32/m) :Fd3m6.AB.75Pertsevite-(F)Mg2(BO3)(F,OH)Orth.mm2 :Pna216.AB.75Pertsevite-(OH)Mg2(BO3)(OH)Orth.mmm(2/m2/m2/m) :Pnma6.AB.80JacquesdietrichiteCu2(H2BO3)(OH)3Orth.mmm(2/m2/m2/m) :Pmna6.AB.85Rhabdoborite-(V)Mg12(V5+,Mo6+,W6+)1.5O6{[BO3]6-x[(P,As)O4]xF2-x} (x < 1)Hex. 6 :P636.AB.85Rhabdoborite-(W)Mg12(W6+,V5+)1.5O6{[BO3]6-x[(P,As)O4]xF2-x}Hex. 6 :P636.AB.85PainiteCaZrAl9(BO3)O15Hex. 6/m :P63/m6.AB.90Mengxianminite(Ca,Na)2Sn2(Mg,Fe)3Al8[(BO3)(BeO4)O6]2Orth.mm2 :Fdd2

Fluorescence of Harkerite

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    • References for HarkeriteⓘDading Fe-Sn depositWang (1983)+1 other reference
    Italy
     
    Barbieri et al. (1973)+1 other referenceJuroszek et al. (Ti 5 Fe)Cavarretta et al. (1987)+2 other references
    Kazakhstan
     
    Pekov (1998)
    Namibia
     
    Dunn (1991)
    Russia
     
    Aleksandrov (1998)Koneva et al. (1991)
    Sweden
     
    Holtstam et al. (1995)
    UK
     
    Tilley (1951)
    USA
     
    ...+1 other referenceValley et al. (1980)+1 other reference
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