Bredigite Mineral Data + 
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- 51.4.1.1 Bredigite Ca7Mg(SiO4)4 P 2nn mm2
- VIII/A.07-10 Merwinite Ca3Mg(SiO4)2 P 21/a 2/m
- VIII/A.07-20 Bredigite Ca7Mg(SiO4)4 P 2nn mm2
- VIII/A.07-30 Larnite Ca2SiO4 P 21/n 2/m
General Bredigite Information |
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 Chemical Formula: |
Ca7Mg(SiO4)4 | ||
| Composition: |
Molecular Weight = 673.18 gm | ||
| Calcium 41.67 % Ca 58.31 % CaO | |||
| Magnesium 3.61 % Mg 5.99 % MgO | |||
| Silicon 16.69 % Si 35.70 % SiO2 | |||
| Oxygen 38.03 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Empirical Formula: |
Ca7Mg(SiO4)4 | ||
| Environment: |
In contact metamophosed limestones and dolostones intruded by diabase. | ||
| IMA Status: |
Valid Species (Pre-IMA) 1948 | ||
| Locality: |
In the USA, at Marble Canyon, Culberson Co., Texas. In Ireland, at Scawt Hill and Ballycraigy, near Larne, Co. Antrim. Link to MinDat.org Location Data. | ||
| Name Origin: |
For Max Albrecht Bredig (1902- ), physical chemist, who studied the polymorphism of Ca2SiO4. | ||
| Synonym: |
ICSD 9828 | ||
| PDF 36-399 | |||
Bredigite Image | |||
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Images:
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Bredigite Crystallography |
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| Axial Ratios: |
a:b:c =0.5948:1:0.3674 | ||
| Cell Dimensions: |
a = 10.909, b = 18.34, c = 6.739, Z = 4; V = 1,348.28 Den(Calc)= 3.32 | ||
| Crystal System: |
Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: P 2nn | ||
| X Ray Diffraction: |
By Intensity(I/Io): 2.663(1), 2.73(1), 2.259(0.8), | ||
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Crystal Structure:
Mouse |
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Physical Properties of Bredigite |
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| Cleavage: |
[130] Distinct | ||
| Color: |
Colorless, Gray. | ||
| Density: |
3.4 | ||
| Diaphaniety: |
Transparent | ||
| Luster: |
Vitreous (Glassy) | ||
| Streak: |
white | ||
Optical Properties of Bredigite |
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| Gladstone-Dale: |
CI meas= -0.011 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= -0.036 (Excellent) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2162,KPDmeas= 0.2111,KC= 0.2087 |
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| Optical Data: |
Biaxial (+), a=1.712, b=1.716, g=1.725, bire=0.0130, 2V(Calc)=68, 2V(Meas)=30. | ||
Calculated Properties of Bredigite |
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| Electron Density: |
relectron=3.39 gm/cc |
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| Fermion Index |
Fermion Index = 0.01214 Boson Index = 0.98786 |
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| Photoelectric: |
PEBredigite = 5.82 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Bredigite is Not Radioactive |
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Bredigite Classification |
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| Dana Class: |
51.4.1.1 (51)Nesosilicate Insular SiO4 Groups Only | ||
| (51.4)with cations in [6] and >[6] coordination | |||
| (51.4.1)Dana Group | |||
| Strunz Class: |
VIII/A.07-20 VIII - Silicates | ||
| VIII/A - Nesosilicates with [SiO4]4-groups, cations of octahedral orientation [6] | |||
| VIII/A.07 - Larnite series | |||
Other Bredigite Information |
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| References: |
NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) | ||
| See Also: |
Links to other databases for Bredigite : 1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris Search for Bredigite using: Visit our Advertisers for Bredigite : Translate Bredigite Mineral Data : Ask about Bredigite here : Print or Cut-and-Paste your Bredigite Specimen Label here :
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