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Julgoldite-(Fe3+)

A valid IMA mineral species
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About Julgoldite-(Fe3+)Hide

07102560015066351065138.jpg
Julian R. Goldsmith
Formula:
Ca2Fe3+Fe3+2[Si2O6OH][SiO4](OH)2O
Colour:
Black
Lustre:
Sub-Metallic
Hardness:
Specific Gravity:
3.56 - 3.60
Crystal System:
Monoclinic
Name:
Named in 1971 by Moore in honor of Julian Royce Goldsmith (26 February 1918, Chicago, Illinois, USA - 23 January 1999, USA), geochemist at the University of Chicago. He was an expert on feldspars and carbonates. He also served as president of the Geochemical Society, the Mineralogical Society of America, and the Geological Society of America.
Pumpellyite Group

The Fe-rich Karadag julgoldite-(Fe3+) bears some molecular water.


Unique IdentifiersHide

Mindat ID:
7125
Long-form identifier:
mindat:1:1:7125:9
GUID
(UUID V4):
8951b803-7e8e-48d3-9632-998a206432f5

IMA Classification of Julgoldite-(Fe3+)Hide

Approved
IMA Formula:
Ca2Fe3+Fe3+2(Si2O7)(SiO4)O(OH) · H2O
Approval year:
1966
First published:
1971

Classification of Julgoldite-(Fe3+)Hide

9.BG.20

9 : SILICATES (Germanates)
B : Sorosilicates
G : Sorosilicates with mixed SiO4 and Si2O7 groups; cations in octahedral [6] and greater coordination
58.2.2.2

58 : SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
2 : Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)

Mineral SymbolsHide

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

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

SymbolSourceReference
Jul-Fe3+IMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
JulThe Canadian Mineralogist (2019)The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download

Physical Properties of Julgoldite-(Fe3+)Hide

Sub-Metallic
Colour:
Black
Streak:
Greenish-olive with a bluish tinge
Hardness:
4½ on Mohs scale
Cleavage:
Distinct/Good
good {100}
Density:
3.56 - 3.60 g/cm3 (Measured)    3.60 g/cm3 (Calculated)

Optical Data of Julgoldite-(Fe3+)Hide

Type:
Biaxial (-)
RI values:
nα = 1.776 nβ = 1.814
2V:
Measured: 50° to 70°, Calculated: 73°
Max Birefringence:
δ = 1.776
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Pleochroism:
Strong
Comments:
X = pale brown, Y = pale brownish-green, Z = deep emerald-green

Chemistry of Julgoldite-(Fe3+)Hide

Mindat Formula:
Ca2Fe3+Fe3+2[Si2O6OH][SiO4](OH)2O

Crystallography of Julgoldite-(Fe3+)Hide

Crystal System:
Monoclinic
Cell Parameters:
a = 8.935(15) Å, b = 6.065(20) Å, c = 19.39(2) Å
β = 97.4°
Ratio:
a:b:c = 1.473 : 1 : 3.197
Unit Cell V:
1,042.01 ų (Calculated from Unit Cell)
Z:
4
Twinning:
twinned on {001}
Comment:
Space group A2/m

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0003146Julgoldite-(Fe3+)Artioli G, Geiger C A, Dapiaggi M (2003) The crystal chemistry of julgoldite-Fe3+ from Bombay, India, studied using synchrotron X-ray powder diffraction and 57Fe Mossbauer spectroscopy American Mineralogist 88 1084-109020030293
0014461Julgoldite-(Fe3+)Allmann R, Donnay G (1973) The crystal structure of julgoldite Mineralogical Magazine 39 271-2811973Langban, Sweden0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.80 Å(7)
3.84 Å(8)
2.95 Å(10)
2.78 Å(6)
2.57 Å(7)
2.385 Å(5)
1.62 Å(5)
1.52 Å(5)

Type Occurrence of Julgoldite-(Fe3+)Hide

Associated Minerals at Type Locality:
Reference:
Moore, P.B. (1971) Julgoldite, the Fe+2 - Fe+3 dominant pumpellyite, a new mineral from LĂ„ngban, Sweden. Lithos: 4: 93-99.

Synonyms of Julgoldite-(Fe3+)Hide

Other Language Names for Julgoldite-(Fe3+)Hide

Relationship of Julgoldite-(Fe3+) to other SpeciesHide

Other Members of this group:
Julgoldite-(Fe2+)Ca2Fe2+Fe3+2[Si2O6OH][SiO4](OH)2(OH)Mon. 2/m
Julgoldite-(Mg)Ca2MgFe3+2[Si2O6OH][SiO4](OH)2(OH)Mon.

Common AssociatesHide

Associated Minerals Based on Photo Data:
4 photos of Julgoldite-(Fe3+) associated with ChalcedonySiO2
2 photos of Julgoldite-(Fe3+) associated with Stilbite-CaNaCa4(Si27Al9)O72 · 28H2O
2 photos of Julgoldite-(Fe3+) associated with FluoriteCaF2
2 photos of Julgoldite-(Fe3+) associated with QuartzSiO2
1 photo of Julgoldite-(Fe3+) associated with IlvaiteCaFe3+Fe2+2(Si2O7)O(OH)
1 photo of Julgoldite-(Fe3+) associated with StelleriteCa4(Si28Al8)O72 · 28H2O
1 photo of Julgoldite-(Fe3+) associated with Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
1 photo of Julgoldite-(Fe3+) associated with Stilbite SubgroupM6-7[Al8-9Si27-28O72] · nH2O

Related Minerals - Strunz-mindat GroupingHide

9.BG.Shuiskite-(Cr)Ca2Cr3+Cr3+2[Si2O6OH][SiO4](OH)2OMon. 2/m : B2/m
9.BG.AlnaperbĂžeite-(Ce)Ca(Ce2.5Na0.5)(AlAl2Al)[Si2O7][SiO4]3O(OH)2Mon. 2/m : P21/m
9.BG.MagnesiovesuvianiteCa19MgAl4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10](OH)(OH)9Tet. 4/m : P4/n
9.BG.AlumovesuvianiteCa19AlAl4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9Tet. 4/m : P4/n
9.BG.Zoisite-(Pb)(CaPb)(AlAlAl)O[Si2O7][SiO4](OH)Orth. mmm (2/m 2/m 2/m) : Pnma
9.BG.Vielleaureite-(Ce)(Mn2+Ce)(MgAlMn2+)F[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.Heflikite(CaCa)(AlAlSc)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.Zilbermintsite-(La)(CaLa5)(Fe3+Al3Fe2+)[Si2O7][SiO4]5O(OH)3Mon. 2/m : P21/m
9.BG.05bAllanite-(Ce)(CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05bAllanite-(La)(CaLa)(AlAlFe2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05bAllanite-(Y)(CaY)(AlAlFe2+)O[Si2O7][SiO4](OH)Mon.
9.BG.05aClinozoisite(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05bDissakisite-(Ce)(CaCe)(AlAlMg)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05Dollaseite-(Ce)(CaCe)(MgAlMg)F[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05aEpidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05aHancockite(CaPb)(AlAlFe3+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05Khristovite-(Ce)(CaCe)(MgAlMn2+)F[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05aMukhinite(CaCa)(AlAlV3+)O[Si2O7][SiO4](OH)Mon.
9.BG.05aPiemontite(CaCa)(AlAlMn3+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05Piemontite-(Sr)(CaSr)(AlAlMn3+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05bManganiandrosite-(La)(Mn2+La)(Mn3+AlMn2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05Tweddillite(CaSr)(Mn3+AlMn3+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05bFerriallanite-(Ce)(CaCe)(Fe3+AlFe2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05Niigataite(CaSr)(AlAlAl)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05Manganiandrosite-(Ce)(Mn2+Ce)(Mn3+AlMn2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05Dissakisite-(La)(CaLa)(AlAlMg)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05Vanadoandrosite-(Ce)(Mn2+Ce)(V3+AlMn2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05Uedaite-(Ce)(Mn2+Ce)(AlAlFe2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05aEpidote-(Sr)(CaSr)(AlAlFe3+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05bAllanite-(Nd)(CaNd)(AlAlFe2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05bUnnamed (Mg-analogue of Ferriallanite-(Ce))(CaCe)(Fe3+AlMg)O[Si2O7][SiO4](OH)
9.BG.05bUnnamed (Mn3+-analogue of Ferriakasakaite-(Ce))(CaCe)(Mn3+AlMn2+)O[Si2O7][SiO4](OH)
9.BG.05bFerriallanite-(La)(CaLa)(Fe3+AlFe2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05bÅskagenite-(Nd)(Mn2+Nd)(AlAlFe3+)O[Si2O7][SiO4]OMon. 2/m : P21/m
9.BG.05Piemontite-(Pb)(CaPb)(AlAlMn3+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05bVanadoallanite-(La)(CaLa)(V3+AlFe2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05Ferriandrosite-(La)(Mn2+La)(Fe3+AlMn2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05Androsite-(Ce)(Mn2+Ce)(AlAlMn2+)O[Si2O7][SiO4](OH)
9.BG.05a vUnnamed (Ga-analogue of Epidote)(CaCa)(AlAlGa3+)O[Si2O7][SiO4](OH)
9.BG.05bUM1989-32-SiO:AlCaFeHREE(Ca0.5◻0.5REE)(AlAlFe3+)O[Si2O7][SiO4](OH)
9.BG.05bManganiakasakaite-(La)(CaLa)(Mn3+AlMn2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.05bFerriakasakaite-(Ce)(CaCe)(Fe3+AlMn2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.9.BG.Ferriakasakaite-(La)(CaLa)(Fe3+AlMn2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.9.BG.Ferriandrosite-(Ce)(Mn2+Ce)(Fe3+AlMn2+)O[Si2O7][SiO4](OH)Mon. 2/m : P21/m
9.BG.9.BGFerriperbĂžeite-(Ce)CaCe3(Fe3+Al2Fe2+)[Si2O7][SiO4]3O(OH)2Mon. 2/m : P21/m
9.BG.10Zoisite(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)Orth. mmm (2/m 2/m 2/m) : Pnma
9.BG.15MacfalliteCa2Mn3+3(SiO4)(Si2O7)(OH)3Mon. 2/m : P21/m
9.BG.15SursassiteMn2+2Al3(SiO4)(Si2O7)(OH)3Mon. 2/m : P21/m
9.BG.20Julgoldite-(Fe2+)Ca2Fe2+Fe3+2[Si2O6OH][SiO4](OH)2(OH)Mon. 2/m
9.BG.20OkhotskiteCa2Mn2+Mn3+2[Si2O6OH][SiO4](OH)2(OH)Mon. 2/m
9.BG.20Pumpellyite-(Fe2+)Ca2Fe2+Al2(Si2O7)(SiO4)(OH,O)2 · H2OMon. 2/m
9.BG.20Pumpellyite-(Fe3+)Ca2Fe3+Al2(Si2O7)(SiO4)(OH,O)2 · H2OMon. 2/m
9.BG.20Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2OMon. 2/m
9.BG.20Pumpellyite-(Mn2+)Ca2Mn2+Al2(Si2O7)(SiO4)(OH)2 · H2OMon. 2/m
9.BG.20Shuiskite-(Mg)Ca2MgCr3+2[Si2O6OH][SiO4](OH)2(OH)Mon. 2/m
9.BG.20Pumpellyite-(Al)Ca2Al3(Si2O7)(SiO4)(OH,O)2 · H2OMon. 2/m
9.BG.20PoppiiteCa2V3+V3+2[Si2O6OH][SiO4](OH)2OMon. 2/m : B2/m
9.BG.20Julgoldite-(Mg)Ca2MgFe3+2[Si2O6OH][SiO4](OH)2(OH)Mon.
9.BG.25GanomalitePb9Ca5Mn(Si2O7)4(SiO4)OHex. 6 : P6
9.BG.25WayneburnhamitePb9Ca6(Si2O7)3(SiO4)3Hex. 6 : P6
9.BG.30RustumiteCa10(Si2O7)2(SiO4)(OH)2Cl2Mon. 2/m : B2/b
9.BG.35VesuvianiteCa19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9Tet. 4/mmm (4/m 2/m 2/m) : P4/nnc
9.BG.35WiluiteCa19MgAl4(Al,Mg)8(B,◻)4◻[Si2O7]4[(SiO4)10]O(O,OH)9Tet. 4/mmm (4/m 2/m 2/m) : P4/nnc
9.BG.35ManganvesuvianiteCa19Mn3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9Tet. 4/m : P4/n
9.BG.35FluorvesuvianiteCa19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(F,OH)9Tet. 4/mmm (4/m 2/m 2/m) : P4/nnc
9.BG.35CyprineCa19Cu2+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10](OH)(OH)9Tet. 4/m : P4/n
9.BG.35HongheiteCa19Fe2+Al4(Fe3+,Mg)8(◻4)B[Si2O7]4[(SiO4)10]O(OH,O)9Tet. 4/mmm (4/m 2/m 2/m) : P4/nnc
9.BG.35Milanriederite(Ca18[REE])Fe3+Al4(Mg4Al4)(◻4)◻[Si2O7]4[(SiO4)10](OH)(OH)9Tet. 4/mmm (4/m 2/m 2/m) : P4/nnc
9.BG.35Manaevite-(Ce)(Ca13Ce4[H2O]2)Mg(Al3Mg)(Mg3Ti3Fe3+2)(◻4)◻[Si2O7]4[(SiO4)8(H4O4)2]O(OH)9Tet. 4/mmm (4/m 2/m 2/m) : P4/nnc
9.BG.40Vyuntspakhkite-(Y)(Y,Yb)4Al2.5-1.5(Si,Al)1.5-2.5(SiO4)4O(OH)7Mon.
9.BG.45DellaiteCa6Si3O11(OH)2Tric.
9.BG.50Gatelite-(Ce)CaCe3(AlAl2Mg)[Si2O7][SiO4]3O(OH)2Mon. 2/m : P21/b
9.BG.50PerbĂžeite-(Ce)CaCe3(AlAl2Fe2+)[Si2O7][SiO4]3O(OH)2 Mon. 2/m : P21/m
9.BG.50FerriperbĂžeite-(La) CaLa3(Fe3+Al2Fe2+)[Si2O7][SiO4]3O(OH)2Mon. 2/m : P21/m
9.BG.50PerbĂžeite-(La)CaLa3(AlAl2Fe2+)[Si2O7][SiO4]3O(OH)2 Mon. 2/m : P21/m
9.BG.55VĂ€stmanlandite-(Ce)CaCe3(MgAl2Mg)[Si2O7][SiO4]3F(OH)2Mon. 2/m : P21/m
9.BG.60RadekĆĄkodaite-(La) (CaLa5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3Mon. 2/m : P21/m
9.BG.60RadekĆĄkodaite-(Ce)(CaCe5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3Mon. 2/m : P21/m

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for Julgoldite-(Fe3+)Hide

References for Julgoldite-(Fe3+)Hide

Localities for Julgoldite-(Fe3+)Hide

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
 
  • QuĂ©bec
    • Outaouais
      • Pontiac RCM
        • Otter Lake
Schumann et al. (2019)
India
 
  • Maharashtra
    • Konkan Division
AmMin 88:1084 (2003)
    • Nashik Division
www.cs.cmu.edu/~adg/adg-psssimages.html
South Africa
 
  • Mpumalanga
    • Nkangala District Municipality
      • Emakhazeni Local Municipality
        • Belfast
Cairncross et al. (1998)
Sweden (TL)
 
  • VĂ€rmland County
    • Filipstad
      • LĂ„ngban Ore District
Moore (1971) +1 other reference
      • Persberg ore district
        • Pajsberg
Kjell Gatedal collection and ... +1 other reference
Ukraine
 
  • Crimea
    • Bakhchysarai
      • Trudolyubovka
Kasatkin (2019)
Kasatkin et al. (2021)
 
Mineral and/or Locality  
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