Julgoldite-(Fe3+) (original) (raw)

A valid IMA mineral species

About Julgoldite-(Fe3+)Hide

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Formula:

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

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.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:7125:9

8951b803-7e8e-48d3-9632-998a206432f5

IMA Classification of Julgoldite-(Fe3+)Hide

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IMA Formula:

Ca2Fe3+Fe3+2(Si2O7)(SiO4)O(OH) · H2O

Type description reference:

Classification of Julgoldite-(Fe3+)Hide

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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

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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.

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

Physical Properties of Julgoldite-(Fe3+)Hide

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Streak:

Greenish-olive with a bluish tinge

Cleavage:

Distinct/Good
good {100}

Density:

3.56 - 3.60 g/cm3 (Measured) 3.60 g/cm3 (Calculated)

Optical Data of Julgoldite-(Fe3+)Hide

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RI values:

_n_α = 1.776 _n_β = 1.814

2V:

Measured: 50° to 70°, Calculated: 73°

δ = 1.776

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Comments:

X = pale brown, Y = pale brownish-green, Z = deep emerald-green

Chemistry of Julgoldite-(Fe3+)Hide

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Mindat Formula:

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

Crystallography of Julgoldite-(Fe3+)Hide

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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)

Twinning:

twinned on {001}

Crystal StructureHide

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X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Type Occurrence of Julgoldite-(Fe3+)Hide

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Associated Minerals at Type Locality:

Reference:

Moore, P.B. (1971) Julgoldite, the Fe+2 - Fe+3 dominant pumpellyite, a new mineral from Långban, Sweden. Lithos: 4: 93-99.

Synonyms of Julgoldite-(Fe3+)Hide

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Other Language Names for Julgoldite-(Fe3+)Hide

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Relationship of Julgoldite-(Fe3+) to other SpeciesHide

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Other Members of this group:

Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Other InformationHide

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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

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References for Julgoldite-(Fe3+)Hide

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Reference List:

Kasatkin, А. V., Zubkova, N.V., Chukanov, N.V., Ksenofontov, D.A., Škoda, R., Tishchenko, A.I., Voronin, M.V., Britvin, S.N., Pekov, I.V. (2021) Необычно богатый железом джулголдит-(Fe 3+ ) из Карадагского вулканического массива (Крымский полуостров) [Unusually iron-rich julgoldite-(Fe3+) from the Karadag Volcanic Massif (Crimea Peninsula)]. Zapiski RMO (Proceedings of the Russian Mineralogical Society), CL (6) 96-112 doi:10.31857/s0869605521060034

Localities for Julgoldite-(Fe3+)Hide

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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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- 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.