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Merwinite Mineral Data |
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Merwinite Mineral Data |
General Merwinite Information |
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 Chemical Formula: |
Ca3Mg(SiO4)2 | ||
| Composition: |
Molecular Weight = 328.71 gm | ||
| Calcium 36.58 % Ca 51.18 % CaO | |||
| Magnesium 7.39 % Mg 12.26 % MgO | |||
| Silicon 17.09 % Si 36.56 % SiO2 | |||
| Oxygen 38.94 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Empirical Formula: |
Ca3Mg(SiO4)2 | ||
| Environment: |
In siliceous dolomitic limestone in contact metamorphic zones, formed at relatively elevated temperatures. | ||
| IMA Status: |
Valid Species (Pre-IMA) 1921 | ||
| Locality: |
Crestmore quarry, 5 miles NW of Riverside, Riverside Co., California. Link to MinDat.org Location Data. | ||
| Name Origin: |
Herbert Eugene Merwin (1878-1963), American mineralogist and petrologist, Carnegie Institute, Washington, D.C., USA. | ||
| Name Pronunciation: |
Merwinite + Pronunciation  |
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| Synonym: |
ICSD 26002 | ||
| PDF 35-591 | |||
Merwinite Image | |||
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Images:
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Merwinite Crystallography |
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| Axial Ratios: |
a:b:c =2.504:1:1.7623 | ||
| Cell Dimensions: |
a = 13.254, b = 5.293, c = 9.328, Z = 4; beta = 91.9° V = 654.03 Den(Calc)= 3.34 | ||
| Crystal System: |
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/a | ||
| X Ray Diffraction: |
By Intensity(I/Io): 2.6865(1), 2.6712(0.65), 2.653(0.47), | ||
Physical Properties of Merwinite |
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| Cleavage: |
{010} Perfect | ||
| Color: |
Colorless, Gray, Pale green. | ||
| Density: |
3.15 | ||
| Diaphaneity: |
Transparent to translucent | ||
| Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. | ||
| Habit: |
Granular - Generally occurs as anhedral to subhedral crystals in matrix. | ||
| Hardness: |
6 - Orthoclase | ||
| Luminescence: |
Non-fluorescent. | ||
| Luster: |
Vitreous (Glassy) | ||
| Magnetism: |
Nonmagnetic | ||
| Streak: |
white | ||
Optical Properties of Merwinite |
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| Gladstone-Dale: |
CI meas= -0.088 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= -0.026 (Excellent) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2135,KPDmeas= 0.2264,KC= 0.208 Ncalc = 1.66 - 1.69 |
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| Optical Data: |
Biaxial (+), a=1.706-1.708, b=1.711-1.712, g=1.718-1.724, bire=0.0120-0.0160, 2V(Calc)=62-82, 2V(Meas)=67. Dispersion r > v. | ||
Calculated Properties of Merwinite |
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| Electron Density: |
Bulk Density (Electron Density)=3.33 gm/cc note: Specific Gravity of Merwinite =3.34 gm/cc. |
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| Fermion Index: |
Fermion Index = 0.01 Boson Index = 0.99 |
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| Photoelectric: |
PEMerwinite = 5.30 barns/electron U=PEMerwinite x rElectron Density= 17.66 barns/cc. |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Merwinite is Not Radioactive |
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Merwinite Classification |
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| Dana Class: |
51.04.02.01 (51)Nesosilicate Insular SiO4 Groups Only | ||
| (51.04)with cations in [6] and >[6] coordination | |||
| (51.04.02)Dana Group | |||
| Strunz Class: |
09.AD.15 09 - SILICATES (Germanates) | ||
| 09.A - Nesosilicates | |||
| 09.AD -Nesosilicates without additional anions; | |||
Other Merwinite Information |
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| References: |
NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65) | ||
| See Also: |
Links to other databases for Merwinite : 1 - Am. Min. Crystal Structure Database 2 - Athena 3 - EUROmin Project 4 - Ecole des Mines de Paris 5 - GeoScienceWorld 6 - Google Images 7 - Google Scholar 8 - Handbook of Mineralogy (MinSocAm) 9 - Handbook of Mineralogy (UofA) 10 - MinDAT 11 - Mineralienatlas (Deutsch) 12 - Online Mineral Museum 13 - QUT Mineral Atlas 14 - Ruff.Info 15 - WWW-MINCRYST Search for Merwinite using: Visit our Advertisers for Merwinite : Ask about Merwinite here : Print or Cut-and-Paste your Merwinite Specimen Label here :
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