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General Pargasite Information |
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 Chemical Formula: |
NaCa2(Mg,Fe++)4Al(Si6Al2)O22(OH)2 | ||
| Composition: |
Molecular Weight = 867.37 gm | ||
| Sodium 2.65 % Na 3.57 % Na2O | |||
| Calcium 9.24 % Ca 12.93 % CaO | |||
| Magnesium 8.41 % Mg 13.94 % MgO | |||
| Aluminum 9.33 % Al 17.63 % Al2O3 | |||
| Iron 6.44 % Fe 8.28 % FeO | |||
| Silicon 19.43 % Si 41.56 % SiO2 | |||
| Hydrogen 0.23 % H 2.08 % H2O | |||
| Oxygen 44.27 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Empirical Formula: |
NaCa2Mg3Fe2+Si6Al3O22(OH)2 | ||
| IMA Status: |
Valid Species (Pre-IMA) 1814 | ||
| Locality: |
Pargas, Finland. Link to MinDat.org Location Data. | ||
| Name Origin: |
Named after its locality. | ||
| Name Pronunciation: |
Pargasite + Pronunciation  |
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| Synonym: |
ICSD 79836 | ||
| PDF 41-1430 | |||
Pargasite Image | |||
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Images:
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Images:
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Pargasite Crystallography |
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| Axial Ratios: |
a:b:c =0.5481:1:0.2943 | ||
| Cell Dimensions: |
a = 9.87, b = 18.006, c = 5.3, Z = 2; beta = 105.26° V = 908.70 Den(Calc)= 3.17 | ||
| Crystal System: |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m | ||
| X Ray Diffraction: |
By Intensity(I/Io): 3.124(1), 8.43(0.4), 3.269(0.35), | ||
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Crystal Structure:
Mouse |
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Physical Properties of Pargasite |
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| Cleavage: |
{110} Perfect, {010} Perfect | ||
| Color: |
Bluish green, Brown, Grayish black, Light brown, Dark green. | ||
| Density: |
3.069 - 3.181, Average = 3.12 | ||
| Diaphaneity: |
Transparent to translucent | ||
| Fracture: |
Brittle - Uneven - Very brittle fracture producing uneven fragments. | ||
| Habit: |
Tabular - Form dimensions are thin in one direction. | ||
| Hardness: |
6 - Orthoclase | ||
| Luster: |
Vitreous (Glassy) | ||
| Streak: |
white | ||
Optical Properties of Pargasite |
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| Gladstone-Dale: |
CI meas= 0.013 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.027 (Excellent) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2019,KPDmeas= 0.2048,KC= 0.2074 Ncalc = 1.64 - 1.66 |
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| Optical Data: |
Biaxial (-), a=1.63, b=1.64, g=1.65, bire=0.0200, 2V(Calc)=88, 2V(Meas)=63. Dispersion r > v. | ||
| Pleochroism (x): |
greenish yellow. | ||
| Pleochroism (y): |
emerald green. | ||
| Pleochroism (z): |
greenish blue. | ||
Calculated Properties of Pargasite |
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| Electron Density: |
Bulk Density (Electron Density)=3.10 gm/cc note: Specific Gravity of Pargasite =3.13 gm/cc. |
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| Fermion Index: |
Fermion Index = 0.01 Boson Index = 0.99 |
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| Photoelectric: |
PEPargasite = 4.28 barns/electron U=PEPargasite x rElectron Density= 13.26 barns/cc. |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Pargasite is Not Radioactive |
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Pargasite Classification |
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| Dana Class: |
66.01.03a.12 (66)Inosilicate Double-Width Unbranched Chains, W=2 | ||
| (66.01)with P=2 amphibole configuration | |||
| (66.01.03a)Group 2, the calcic amphiboles | |||
| Strunz Class: |
09.DE.10 09 - SILICATES (Germanates) | ||
| 09.D - Inosilicates* Structural terminology according to Liebau (1985) | |||
| 09.DE -Inosilicates with 2-periodic double chains, Si4O11; amphibole family | |||
Other Pargasite Information |
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| References: |
NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32) | ||
| See Also: |
Links to other databases for Pargasite : 1 - Am. Min. Crystal Structure Database 2 - Athena 3 - CalTech Mineral Spectroscopy 4 - EUROmin Project 5 - Ecole des Mines de Paris 6 - Franklin Minerals(Dunn) 7 - Franklin Minerals(Palache) 8 - GeoScienceWorld 9 - Google Images 10 - Google Scholar 11 - Handbook of Mineralogy (MinSocAm) 12 - Handbook of Mineralogy (UofA) 13 - MinDAT 14 - Mineralienatlas (Deutsch) 15 - Online Mineral Museum 16 - QUT Mineral Atlas 17 - Ruff.Info 18 - WWW-MINCRYST Search for Pargasite using: Visit our Advertisers for Pargasite : A Bijoux Google Search for PargasiteAdam's Minerals Google Search for Pargasite Cape Minerals Google Search for Pargasite Dakota Matrix Minerals Google Search for Pargasite Excalibur Mineral Corp. Google Search for Pargasite Exceptional Minerals Google Search for Pargasite John Betts Fine Minerals Search for Pargasite McDougall Minerals Google Search for Pargasite Mineral News Website Link Rock and Mineral Shows Google Search for Pargasite Weinrich Minerals, Inc. Google Search for Pargasite Ask about Pargasite here : Print or Cut-and-Paste your Pargasite Specimen Label here :
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