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General Beryl Information |
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 Chemical Formula: |
Be3Al2Si6O18 | ||
| Composition: |
Molecular Weight = 537.50 gm | ||
| Beryllium 5.03 % Be 13.96 % BeO | |||
| Aluminum 10.04 % Al 18.97 % Al2O3 | |||
| Silicon 31.35 % Si 67.07 % SiO2 | |||
| Oxygen 53.58 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Empirical Formula: |
Be3Al2Si6O18 | ||
| Environment: |
Mainly granitic pegmatites. | ||
| IMA Status: |
Valid Species (Pre-IMA) Prehistoric | ||
| Locality: |
Pala pegmatite District, San Diego Co., California for morganite. Columbia for emeralds. Russia for heliodor. Link to MinDat.org Location Data. | ||
| Name Origin: |
From the ancient Greek, beryllos, signifying a "precious blue-green color of sea water" stone, but through later usage, applied only to beryl. | ||
| Name Pronunciation: |
Beryl  |
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| Synonym: |
Aquamarine - Blue varitey | ||
| Emerald - green | |||
| Goshenite - colorless | |||
| Heliodor - yellow | |||
| ICSD 2791 | |||
| Morganite - pink | |||
| PDF 9-430 | |||
Beryl Image | |||
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Beryl Crystallography |
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| Axial Ratios: |
a:c = 1:0.9975 | ||
| Cell Dimensions: |
a = 9.215, c = 9.192, Z = 2; V = 675.98 Den(Calc)= 2.64 | ||
| Crystal System: |
Hexagonal - Dihexagonal DipyramidalH-M Symbol (6/m 2/m 2/m) Space Group: P 6/mmc | ||
| X Ray Diffraction: |
By Intensity(I/Io): 2.867(1), 3.254(0.95), 7.98(0.9), | ||
| Forms:
Mouse |
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Crystal Structure:
Mouse |
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Physical Properties of Beryl |
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| Cleavage: |
{0001} Imperfect | ||
| Color: |
Green, Blue, Yellow, Colorless, Pink. | ||
| Density: |
2.63 - 2.9, Average = 2.76 | ||
| Diaphaneity: |
Transparent to subtranslucent | ||
| Fracture: |
Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments. | ||
| Habit: |
Columnar - Forms columns | ||
| Habit: |
Crystalline - Coarse - Occurs as well-formed coarse sized crystals. | ||
| Habit: |
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). | ||
| Hardness: |
7.5-8 | ||
| Luminescence: |
Non-fluorescent. | ||
| Luster: |
Vitreous - Resinous | ||
| Streak: |
white | ||
Optical Properties of Beryl |
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| Dichroism (e): |
yellowish green, colorless, or colorless. | ||
| Dichroism (w): |
bluish green, blue, or pink. | ||
| Gladstone-Dale: |
CI meas= 0.008 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= -0.039 (Excellent) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2205,KPDmeas= 0.2106,KC= 0.2123 Ncalc = 1.56 - 1.62 |
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| Optical Data: |
Uniaxial (-), e=1.564-1.595, w=1.568-1.602, bire=0.0040-0.0070. | ||
Calculated Properties of Beryl |
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| Electron Density: |
Bulk Density (Electron Density)=2.74 gm/cc note: Specific Gravity of Beryl =2.77 gm/cc. |
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| Fermion Index: |
Fermion Index = 0.06 Boson Index = 0.94 |
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| Photoelectric: |
PEBeryl = 1.55 barns/electron U=PEBeryl x rElectron Density= 4.24 barns/cc. |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Beryl is Not Radioactive |
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Beryl Classification |
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| Dana Class: |
61.01.01.01 (61)Cyclosilicate Six-Membered Rings | ||
| (61.01)with [Si6O18] rings; possible (OH) and Al substitution | |||
| (61.01.01)Beryl group | |||
| Strunz Class: |
09.CJ.05 09 - SILICATES (Germanates) | ||
| 09.C - Cyclosilicates | |||
| 09.CJ -[Si6O18]12- 6-membered single rings (sechser-Einfachringe), | |||
Other Beryl Information |
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| References: |
NAME( Sinkankas66) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65) | ||
| See Also: |
Links to other databases for Beryl : 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 - GeoScienceWorld 10 - Glendale Community College 11 - Google Images 12 - Google Scholar 13 - Handbook of Mineralogy (MinSocAm) 14 - Handbook of Mineralogy (UofA) 15 - HyperPhysics 16 - MinDAT 17 - Mineral and Gemstone Kingdom 18 - Mineralienatlas (Deutsch) 19 - NSDL Reciprocal Net (JAVA) 20 - NSDL Reciprocal Net (JAVA) 21 - Online Mineral Museum 22 - Philatelic Mineralogy 23 - QUT Mineral Atlas 24 - Ruff.Info 25 - Scandinavian mineral gallery 26 - Tradeshop.com - The Rainbow of Gems 27 - University of Texas at Austin 28 - WWW-MINCRYST 29 - YupRocks Search for Beryl using: Visit our Advertisers for Beryl : A Bijoux Google Search for BerylAdam's Minerals Google Search for Beryl Cape Minerals Google Search for Beryl Dakota Matrix Minerals Google Search for Beryl Excalibur Mineral Corp. Google Search for Beryl Exceptional Minerals Google Search for Beryl John Betts Fine Minerals Search for Beryl McDougall Minerals Google Search for Beryl Mineral News Website Link Rock and Mineral Shows Google Search for Beryl Weinrich Minerals, Inc. Google Search for Beryl Ask about Beryl here : Print or Cut-and-Paste your Beryl Specimen Label here :
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