Bredigite (original) (raw)

A valid IMA mineral species - grandfathered

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About BredigiteHide

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Crystal System:

Orthorhombic

Name:

Named in honor of Dr. Max Albrecht Bredig (20 June 1902 - 21 November 1977), physical chemist, who studied the polymorphism of Ca2SiO4. Dr. Bredig was former Associate Director of the Chemistry Division Oak Ridge National Laboratory, and expert in the chemistry of molten salts and chemistry of the solid state, especially high temperature and crystal chemistry.

Anthropogenic "Ca7MgSi4O16" is described by Žáček et al. (2005).

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:762:9

eae67ac7-9ef6-454f-aa1b-b86358da0271

IMA Classification of BredigiteHide

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Approved, 'Grandfathered' (first described prior to 1959)

Type description reference:

Classification of BredigiteHide

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9.AD.20

9 : SILICATES (Germanates)
A : Nesosilicates
D : Nesosilicates without additional anions; cations in [6] and/or greater coordination

51.4.1.1

51 : NESOSILICATES Insular SiO4 Groups Only
4 : Insular SiO4 Groups Only with cations in [6] and >[6] coordination

14.5.7

14 : Silicates not Containing Aluminum
5 : Silicates of Ca

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
Bdi 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 BredigiteHide

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Cleavage:

Distinct/Good
Distinct on {130}

Density:

3.42 g/cm3 (Measured) 3.32 g/cm3 (Calculated)

Optical Data of BredigiteHide

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RI values:

_n_α = 1.712 _n_β = 1.716 _n_γ = 1.725

2V:

Measured: 30° , Calculated: 68°

δ = 0.013

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

Dispersion:

relatively strong

Comments:

In thick sections, X = pale violet; Y = Z = colorless to pale green. X=b, Y=a, Z=c.

Chemistry of BredigiteHide

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Mindat Formula:

Ca7Mg(SiO4)4

Common Impurities:

Ti,Fe,Mn,Ba,F

Crystallography of BredigiteHide

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Crystal System:

Orthorhombic

Class (H-M):

m _m_2 - Pyramidal

Cell Parameters:

a = 10.909(9) Å, b = 18.34(1) Å, c = 6.739(9) Å

Ratio:

a:b:c = 0.595 : 1 : 0.367

Unit Cell V:

1,348.28 ų (Calculated from Unit Cell)

Twinning:

Simple contact and cyclical on {110}.

Crystal StructureHide

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ID Species Reference Link Year Locality Pressure (GPa) Temp (K)
0000494 Bredigite Moore P B, Araki T (1976) The crystal structure of bredigite and the genealogy of some alkaline earth orthosilicates American Mineralogist 61 74-87 1976 0 293

CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

d-spacing Intensity
2.730 Å (100)
2.663 Å (100)
2.259 Å (80)
1.923 Å (80)
2.067 Å (60)
1.574 Å (60)
1.554 Å (60)

Geological EnvironmentHide

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Type Occurrence of BredigiteHide

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General Appearance of Type Material:

Crystals are squat, barrel- or boat-shaped, with pseudohexagonal cross sections, or as slender prismatic crystals, to 2mm

Place of Conservation of Type Material:

The Natural History Museum, London, England, 1956, 385.

Geological Setting of Type Material:

Type specimen was from slag (Middlesbrough type specimen of Tilley and Vincent)

Associated Minerals at Type Locality:

Reference:

Tilley, C.E., Vincent, C.G. (1948) The occurrence of an orthorhombic high temperature form of Ca2SiO4 (bredigite) in the Scawt Hill contact-zone and as a constituent of slags. Mineralogical Magazine: 28: 255-271.

Other Language Names for BredigiteHide

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Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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9.AD. Adrianite Ca12(Al4Mg3Si7)O32Cl6 Iso. 43_m_ : I_43_d
9.AD.05 Larnite Ca2SiO4 Mon. 2/m
9.AD.10 Calcio-olivine Ca2SiO4 Orth. m m m _(_2/_m_2/_m_2/m )
9.AD.15 Merwinite Ca3Mg(SiO4)2 Mon. 2/m : _P_21/b
9.AD.25 Midbarite Ca3Mg2(V2Si)O12 Iso. m_3_m _(_4/_m_32/m )
9.AD.25 Menzerite-(Y) (Y2Ca)Mg2(SiO4)3 Iso. m_3_m _(_4/_m_32/m ) : I a_3_d
9.AD.25 Uvarovite Ca3Cr2(SiO4)3 Iso. m_3_m _(_4/_m_32/m ) : I a_3_d
9.AD.25 Eltyubyuite Ca12Fe3+10Si4O32Cl6 Iso. 43_m_ : I_43_d
9.AD.25 Eringaite Ca3Sc2(SiO4)3 Iso. m_3_m _(_4/_m_32/m ) : I a_3_d
9.AD.25 Henritermierite Ca3Mn3+2(SiO4)2[◻(OH)4] Tet. 4/m m m _(_4/_m_2/_m_2/m ) : _I_41/a c d
9.AD.25 va Hydrougrandite (Ca,Mg,Fe2+)3(Fe3+,Al)2[(OH)4(SiO4)2] Iso.
9.AD.25 Calderite Mn2+3Fe3+2(SiO4)3 Iso. m_3_m _(_4/_m_32/m ) : I a_3_d
9.AD.25 Nikmelnikovite Ca12(Fe2+Fe3+3Al3◻)[SiO4]6[◻(OH)4]5◻4 Trig. 3 : _R_3
9.AD.25 Hutcheonite Ca3Ti2(SiO4)(AlO4)2 Iso. m_3_m _(_4/_m_32/m ) : I a_3_d
9.AD.25 Wadalite (Ca,Mg)6(Al,Fe3+)4((Si,Al)O4)3O4Cl3 Iso. 43_m_ : I_43_d
9.AD.25 Rubinite Ca3Ti3+2Si3O12 Iso. m_3_m _(_4/_m_32/m ) : I a_3_d
9.AD.25 Kerimasite Ca3Zr2(SiO4)(Fe3+O4)2 Iso. m_3_m _(_4/_m_32/m ) : I a_3_d
9.AD.25 Holtstamite Ca3Al2(SiO4)2[◻(OH)4] Tet. 4/m m m _(_4/_m_2/_m_2/m ) : _I_41/a c d
9.AD.25 Spessartine Mn2+3Al2(SiO4)3 Iso. m_3_m _(_4/_m_32/m ) : I a_3_d
9.AD.25 Toturite Ca3Sn2(SiO4)(Fe3+O4)2 Iso. m_3_m _(_4/_m_32/m ) : I a_3_d
9.AD.25 Kimzeyite Ca3Zr2(SiO4)(AlO4)2 Iso. m_3_m _(_4/_m_32/m ) : I a_3_d
9.AD.25 Khoharite Mg3Fe3+2(SiO4)3
9.AD.25 Irinarassite Ca3Sn2(SiO4)(AlO4)2 Iso. m_3_m _(_4/_m_32/m ) : I a_3_d
9.AD.25 Knorringite Mg3Cr2(SiO4)3 Iso. m_3_m _(_4/_m_32/m ) : I a_3_d
9.AD.25 Goldmanite Ca3V3+2(SiO4)3 Iso. m_3_m _(_4/_m_32/m ) : I a_3_d
9.AD.25 Blythite Mn2+3Mn3+2[SiO4]3
9.AD.25 Skiagite Fe2+3Fe3+2[SiO4]3
9.AD.25 UM1984-37-SiO:CrMn Mn2+3Cr3+2(SiO4)3
9.AD.25 Almandine Fe2+3Al2(SiO4)3 Iso. m_3_m _(_4/_m_32/m ) : I a_3_d
9.AD.25 va Yamatoite (Mn2+,Ca)3(V3+,Al)2(SiO4)3 Iso.
9.AD.25 Momoiite Mn2+3V3+2(SiO4)3 Iso. m_3_m _(_4/_m_32/m ) : I a_3_d
9.AD.25 Grossular Ca3Al2(SiO4)3 Iso. m_3_m _(_4/_m_32/m ) : I a_3_d
9.AD.25 Andradite Ca3Fe3+2(SiO4)3 Iso. m_3_m _(_4/_m_32/m ) : I a_3_d
9.AD.25 Morimotoite Ca3(TiFe2+)(SiO4)3 Iso. m_3_m _(_4/_m_32/m ) : I a_3_d
9.AD.25 Majorite Mg3(MgSi)(SiO4)3 Iso. m_3_m _(_4/_m_32/m ) : I a_3_d
9.AD.25 Pyrope Mg3Al2(SiO4)3 Iso. m_3_m _(_4/_m_32/m ) : I a_3_d
9.AD.25 Schorlomite Ca3Ti2(SiO4)(Fe3+O4)2 Iso. m_3_m _(_4/_m_32/m ) : I a_3_d
9.AD.30 Hafnon HfSiO4 Tet. 4/m m m _(_4/_m_2/_m_2/m ) : _I_41/a m d
9.AD.30 Zircon Zr(SiO4) Tet. 4/m m m _(_4/_m_2/_m_2/m ) : _I_41/a m d
9.AD.30 Coffinite U(SiO4) · nH2O Tet. 4/m m m _(_4/_m_2/_m_2/m ) : _I_41/a m d
9.AD.30 Thorite Th(SiO4) Tet. 4/m m m _(_4/_m_2/_m_2/m ) : _I_41/a m d
9.AD.30 va Auerlite near Th(Si,P)O4
9.AD.30 Stetindite-(Ce) Ce(SiO4) Tet. 4/m m m _(_4/_m_2/_m_2/m ) : _I_41/a m d
9.AD.35 Tombarthite-(Y) Y4(Si,H4)4O12-x(OH)4+2x Mon.
9.AD.35 Huttonite ThSiO4 Mon. 2/m
9.AD.40 Eulytine Bi4(SiO4)3 Iso. 43_m_ : I_43_d
9.AD.45 Reidite ZrSiO4 Tet. 4/m : _I_41/a
9.AD.55 Jeffbenite Mg3Al2Si3O12 Tet. 42_m_ : I_42_d

Other InformationHide

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Notes:

Dissolves readily in the weakest acids, leaving a silica pseudomorph, gives no effervescence, and yields abundant evidence of calcium.

Health Risks:

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

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References for BredigiteHide

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Reference List:

Žáček, Vladimír, Skála, Roman, Chlupáčová, Marta, Dvořák, (2005) Ca-Fe3+-rich, Si-undersaturated buchite from Zelenky, North-Bohemian Brown Coal Basin, Czech Republic. European Journal of Mineralogy, 17 (4). 623-634 doi:10.1127/0935-1221/2005/0017-0623

Kahlenberg, Volker, Galuskina, Irina, Krüger, Biljana, Pauluhn, Anuschka, Galuskin, Evgeny (2019) Structural investigations on bredigite from the Hatrurim Complex. Mineralogy and Petrology, 113 (2) 261-272 doi:10.1007/s00710-018-0646-z

Localities for BredigiteHide

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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.

Czech Republic
Ústí nad Labem Region Teplice District Zabrušany ⓘ Želénky Žáček et al. (2011)
Georgia
South Ossetia Greater Caucasus Mountain Range Kel’ volcanic area Shadil-Khokh volcano ⓘ NW slope Galuskina et al. (2015) +1 other reference
Germany
Rhineland-Palatinate Mayen-Koblenz Mayen Seekante ⓘ Xenolith CS-020 Skrzyńska et al. (2023)
Vordereifel Ettringen ⓘ Caspar quarry Blass et al. (1998)
ⓘ E-2011 xenolith Sharygin (2012)
ⓘ Xenolith CS-036 (Vondechenite-bearing xenolith) in the collection of Christof Schäfer
Vulkaneifel Daun Üdersdorf ⓘ Emmelberg Blaß et al. (2014)
Israel
Southern District (HaDarom District) ⓘ Arad Kahlenberg et al. (2019)
Tamar Regional Council ⓘ Hatrurim Basin Sharygin et al. (2008)
Jordan
Amman Governorate Transjordan Plateau Daba-Siwaqa complex Hashem region Lisdan-Siwaga Fault Siwaga Tulul al Hammam ⓘ Unnamed marble quarries ? Sokol +9 other references
Middle East
ⓘ Hatrurim Formation Gross (1977)
Russia
Irkutsk Oblast Narin-Kunta ⓘ Birkhin gabbro massif (Ozernovskii) Armbruster et al. (2011) +1 other reference
Krasnoyarsk Krai Evenkiysky District ⓘ Kuzmovka complex Sokol et al. (2019) +2 other references
UK
Northern Ireland Co. Antrim ⓘ Ballycraigy Mineralogical Society of America - ...
Larne Glenoe ⓘ Carneal Sabine et al. (1985)
ⓘ Scawt Hill (TL) Tilley et al. (1948) +2 other references
ⓘ Scotland Tindle (2008)
Highland Caol and Mallaig Isle of Muck ⓘ Camas Mor Intrusion American Mineralogist: 33: 786
Fort William and Ardnamurchan Ardnamurchan ⓘ Camphouse Tony Nikischer +1 other reference
USA
Texas Brewster County Christmas Mountains ⓘ Unnamed skarn deposit Rocks & Minerals (1991)
Culberson County Apache Peak area ⓘ Marble Canyon Mine (Texas Agricultural Aggregates Quarry) Rocks & Minerals: 66 (3) +1 other reference