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|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).
Classification of Bredigite
|IMA status:||Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"|
|Strunz 8th edition ID:||8/A.07-20|
|Nickel-Strunz 10th (pending) edition ID:||9.AD.20|
9 : SILICATES (Germanates)
A : Nesosilicates
D : Nesosilicates without additional anions; cations in  and/or greater coordination
|Dana 8th edition ID:||184.108.40.206|
51 : NESOSILICATES Insular SiO4 Groups Only
4 : Insular SiO4 Groups Only with cations in  and > coordination
|Hey's CIM Ref.:||14.5.7|
14 : Silicates not Containing Aluminum
5 : Silicates of Ca
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Type Occurrence of Bredigite
|Type Locality:||Scawt Hill, Larne, Co. Antrim, Northern Ireland, UK|
|Year of Discovery:||1948|
|Geological Setting of type material:||Type specimen was from slag (Middlesbrough type specimen of Tilley and Vincent)|
Physical Properties of Bredigite
|Density (measured):||3.42 g/cm3|
Crystallography of Bredigite
|Cell Parameters:||a = 10.9Å, b = 18.34Å, c = 6.73Å|
|Ratio:||a:b:c = 0.594 : 1 : 0.367|
|Unit Cell Volume:||V 1,345.37 Å³ (Calculated from Unit Cell)|
Optical Data of Bredigite
|RI values:||nα = 1.712 nβ = 1.716 nγ = 1.725|
|2V:||Measured: 30° , Calculated: 68°|
|Maximum Birefringence:||δ = 0.013|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Chemical Properties of Bredigite
|Essential elements:||Ca, Mg, O, Si|
|All elements listed in formula:||Ca, Mg, O, Si|
Relationship of Bredigite to other Species
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Bredigite
|Health Warning:||No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.|
References for Bredigite
American Mineralogist: 33: 786.
American Mineralogist: 61: 74-87.
Tilley C. E. & C. G. Vincent (1948) The occurrence of an orthorhombic high temperature form of Ca2SiO4 (bredigite) in the Scawt Hill contact-zone and as a constituent of slags. Mineral. Mag. 28, 255-271.
Žáček V., Skála R., Chlupáčová M., Dvořák Z. (2005): Ca-Fe3+-rich, Si-undersaturated buchite from Želénky, northern Bohemian Brown Coal Basin, Czech Republic. European Journal of Mineralogy 17, 623-633.
Internet Links for Bredigite
Localities for Bredigite
The 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.
(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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Locality Updated: Huachocolpa District, Huancavelica Province, Huancavelica Department, PeruFrom Uwe Kolitsch, 19th Jun 2013 07:49:58