[Newest Minerals] [Equipment] [Analytical Services] [About Us] [Mineral Gallery] [eBay Store] See Also: [Diamond Crystals] [Mineral News] [Hudson Institute] [Minerals on CDROM] Rare Minerals, Meteorites, Equipment and Analytical Services Excalibur Mineral Company, World leaders in the supply of rare species Serving the scientific and collector communities since 1974 General Cordierite InformationMg2Al4Si5O18 |
Molecular Weight = 584.95 gm |
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Magnesium 8.31 % Mg 13.78 % MgO |
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Aluminum 18.45 % Al 34.86 % Al2O3 |
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Silicon 24.01 % Si 51.36 % SiO2 |
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Oxygen 49.23 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Mg2Al4Si5O18 |
Magmatic, metamorphic, and pegmatitic rocks. |
Valid Species (Pre-IMA) 1813 |
Bodenmais, Germany. Link to MinDat.org Location Data. |
From the French mining engineer and geologist P. L. A. Cordier (1777-1861). |
Cordierite + Pronunciation |
Dichroite |
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ICSD 100250 |
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Iolite |
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PDF 12-303 |
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Cordierite Crystallographya:b:c =1.7479:1:0.954 |
a = 17.13, b = 9.8, c = 9.35, Z = 4; V = 1,569.62 Den(Calc)= 2.48 |
Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: C ccm |
By Intensity(I/Io): 3.13(1), 8.45(0.8), 8.54(0.8), |
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Mouse
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| Physical Properties of Cordierite{010} Poor |
Colorless, Pale blue, Violet, Yellow, Gray. |
2.55 - 2.75, Average = 2.65 |
Transparent to translucent |
Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz). |
Massive - Granular - Common texture observed in granite and other igneous rock. |
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). |
7 - Quartz |
Non-fluorescent. |
Vitreous (Glassy) |
white |
| Optical Properties of CordieriteCI meas= -0.008 (Superior) - where the CI = (1-KPDmeas/KC) |
CI calc= -0.077 (Fair) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2224,KPDmeas= 0.2081,KC= 0.2065 Ncalc = 1.51 - 1.57 Biaxial (-), a=1.527-1.56, b=1.532-1.574, g=1.538-1.578, bire=0.0110-0.0180, 2V(Calc)=54-86, 2V(Meas)=75-89. Dispersion weak, r < v. |
colorless, pale yellow, or pale yellow. |
colorless, violet, or blue. |
| Calculated Properties of CordieriteBulk Density (Electron Density)=2.63 gm/cc |
note: Specific Gravity of Cordierite =2.65 gm/cc. Fermion Index = 0.01 |
Boson Index = 0.99 PECordierite = 1.65 barns/electron |
U=PECordierite x rElectron Density= 4.32 barns/cc. GRapi = 0 (Gamma Ray American Petroleum Institute Units) |
Cordierite is Not Radioactive | Cordierite Classification61.02.01.01 (61)Cyclosilicate Six-Membered Rings |
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(61.02)with Al substituted rings |
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(61.02.01)Cordierite group |
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09.CJ.10 09 - SILICATES (Germanates) |
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09.C - Cyclosilicates |
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09.CJ -[Si6O18]12- 6-membered single rings (sechser-Einfachringe), |
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| Other Cordierite Information Links to other databases for Cordierite : |
1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 - Am. Min. Crystal Structure Database 4 - Amethyst Galleries' Mineral Gallery 5 - Athena 6 - CalTech Mineral Spectroscopy 7 - EUROmin Project 8 - Ecole des Mines de Paris 9 - Google Images 10 - Google Scholar 11 - Handbook of Mineralogy (MinSocAm) 12 - Handbook of Mineralogy (UofA) 13 - MinDAT 14 - MinMax(Deutsch) 15 - MinMax(English) 16 - Mineralienatlas (Deutsch) 17 - Philatelic Mineralogy 18 - QUT Mineral Atlas 19 - Ruff.Info 20 - Scandinavian mineral gallery 21 - Thin Sections - Brock University 22 - Tradeshop.com - The Rainbow of Gems 23 - UCLA - Petrography Thin-Sections 24 - WWW-MINCRYST Search for Cordierite using: Visit our Advertisers for Cordierite : AA Mineral SpecimensB & L Fine Minerals Crystalarium.com Dan Weinrich Fine Minerals Dan Weinrich Auctions Dakota Matrix Desert Winds Gems and Minerals Excalibur Minerals Exceptional Minerals Fabre Minerals Heliodor John Betts Fine Minerals Mason's Minerals Mineral News Mineral of the Month Club Wrights Rock Shop Translate Cordierite Mineral Data : Ask about Cordierite here : Print or Cut-and-Paste your Cordierite Specimen Label here :
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