General Paragonite Information
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Chemical Formula: |
NaAl2(Si3Al)O10(OH)2 |
Composition: |
Molecular Weight = 382.20 gm |
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Sodium 6.02 % Na 8.11 % Na2O |
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Aluminum 21.18 % Al 40.02 % Al2O3 |
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Silicon 22.05 % Si 47.16 % SiO2 |
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Hydrogen 0.53 % H 4.71 % H2O |
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Oxygen 50.23 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
NaAl3Si3O10(OH)2 |
Environment: |
Metamorphic mineral formed in schists and gneisses under a broad range of P-T conditions. Commonly mistaken for "sericite". |
IMA Status: |
Valid Species (Pre-IMA) 1843 |
Locality: |
Mte. Campione, Tessin, Switzerland. Link to MinDat.org Location Data. |
Name Origin: |
Named from the Greek for "to mislead", in allusion to its originally having been mistaken for talc. |
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Paragonite Image |
Images:
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Paragonite Chloritoid
Comments: Grayish crystalline inclusion of chloritoid in white, massive paragonite.
Location: Drandorf Fundgrube Mine, Bockau, Schwarzenberg District, Erzgebirge, Saxony, Germany.
Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag |
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Images:
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Paragonite Crystallography
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Axial Ratios: |
a:b:c =0.577:1:2.1732 |
Cell Dimensions: |
a = 5.13, b = 8.89, c = 19.32, Z = 4; beta = 95° V = 877.75 Den(Calc)= 2.89 |
Crystal System: |
MonoclinicSpace Group: C 2/c,Cc |
X Ray Diffraction: |
By Intensity(I/Io): 2.522(1), 4.39(0.9), 3.203(0.8), |
Crystal Structure:
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Comodi P , Zanazzi P F , Physics and Chemistry of Minerals , 24 (1997) p.274-280, Pressure dependence of structural parameters of paragonite, Sample: P = .0001 kbar, Note: z-coordinate for T1 altered by author, Dec 2003
View Additional jPOWD Structure files for Paragonite
[2]
[3]
[4]
[8]
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Physical Properties of Paragonite
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Cleavage: |
[001] Perfect |
Color: |
White, Yellow. |
Density: |
2.78 |
Diaphaniety: |
Transparent to translucent |
Habit: |
Massive - Fibrous - Distinctly fibrous fine-grained forms. |
Habit: |
Scaly - Morphology like fish scales. |
Hardness: |
2.5 - Finger Nail |
Luster: |
Pearly |
Streak: |
white |
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Optical Properties of Paragonite
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Gladstone-Dale: |
CI meas= -0.004 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.034 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2051,KPDmeas= 0.2132,KC= 0.2124 |
Optical Data: |
Biaxial (-), a=1.564-1.58, b=1.594-1.609, g=1.6-1.609, bire=0.0290-0.0360, 2V(Calc)=0-46, 2V(Meas)=0-40. |
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Calculated Properties of Paragonite
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Electron Density: |
relectron=2.76 gm/cc note: rParagonite =2.78 gm/cc. |
Fermion Index |
Fermion Index = 0.01053 Boson Index = 0.98947 |
Photoelectric: |
PEParagonite = 1.57 barns/electron U=PEParagonite x relectron= 4.34 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Paragonite is Not Radioactive |
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Paragonite Classification
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Dana Class: |
71.2.2a.2 (71)Phyllosilicate Sheets of Six-Membered Rings |
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(71.2)with 2:1 Layers |
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(71.2.2a)Mica Group (Muscovite subgroup) |
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71.2.2a.1 Muscovite KAl2(Si3Al)O10(OH,F)2 C 2/m 2/m |
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71.2.2a.2 Paragonite NaAl2(Si3Al)O10(OH)2 C 2/c,Cc Mono |
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71.2.2a.3 Chernykhite (Ba,Na)V,Al)2(Si,Al)4O10(OH)2 C 2/c 2/m |
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71.2.2a.4 Roscoelite K(V,Al,Mg)2AlSi3O10(OH)2 C 2/m 2/m |
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71.2.2a.5 Glauconite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2 C 2/m 2/m |
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71.2.2a.6 Celadonite K(Mg,Fe)(Fe,Al)[Si4O10](OH)2 C 2/m 2/m |
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71.2.2a.6b Ferroceladonite! K2FeFeSi8O20(OH)4 C 2/m 2/m |
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71.2.2a.6c Ferro-aluminoceladonite! K2Fe2Al2Si8O20(OH)4 C 2/m 2/m |
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71.2.2a.6d Aluminoceladonite! KAl(Mg,Fe)[]Si4O10(OH)2 2/m |
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71.2.2a.6e Chromceladonite! KCrMg(Si4O10)(OH)2 C 2 2 |
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71.2.2a.7 Tobelite (NH4,K)Al2(Si3Al)O10(OH)2 C 2/m 2/m |
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71.2.2a.8 Nanpingite Cs(Al,Mg,Fe,Li)2(Si3Al)O10(OH,F)2 C 2/c 2/m |
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71.2.2a.9 Boromuscovite KAl2(Si3B)O10(OH,F)2 C 2/m 2/m |
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71.2.2a.10 Montdorite (K,Na)(Fe,Mn,Mg)2.5[Si4O10](F,OH)2 C 2/c 2/m |
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71.2.2a.11 Chromphyllite! (K,Ba)(Cr,Al)2[AlSi3O10](OH,F)2 C 2c 2/m |
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71.2.2a.12 Shirokshinite! K(NaMg2)Si4O10F2 C 2/m 2/m |
Strunz Class: |
VIII/H.10-50 VIII - Silicates |
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VIII/H - Phyllosilicates (layered) Mica like layered silicates with [Si4O10]4- and related groups |
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VIII/H.10 - Mica group, Muscovite series |
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VIII/H.10-10 Aluminoceladonite! KAl(Mg,Fe)[]Si4O10(OH)2 2/m |
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VIII/H.10-20 Ferro-aluminoceladonite! K2Fe2Al2Si8O20(OH)4 C 2/m 2/m |
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VIII/H.10-30 Celadonite K(Mg,Fe)(Fe,Al)[Si4O10](OH)2 C 2/m 2/m |
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VIII/H.10-35 Chromceladonite! KCrMg(Si4O10)(OH)2 C 2 2 |
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VIII/H.10-40 Ferroceladonite! K2FeFeSi8O20(OH)4 C 2/m 2/m |
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VIII/H.10-50 Paragonite NaAl2(Si3Al)O10(OH)2 C 2/c,Cc Mono |
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VIII/H.10-60 Boromuscovite KAl2(Si3B)O10(OH,F)2 C 2/m 2/m |
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VIII/H.10-70 Muscovite KAl2(Si3Al)O10(OH,F)2 C 2/m 2/m |
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VIII/H.10-80 Chromphyllite! (K,Ba)(Cr,Al)2[AlSi3O10](OH,F)2 C 2c 2/m |
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VIII/H.10-90 Roscoelite K(V,Al,Mg)2AlSi3O10(OH)2 C 2/m 2/m |
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VIII/H.10-95 Ganterite! [Ba0.5(Na,K)0.5]Al2(Si2.5Al1.5O10)(OH)2 C 2/c 2/m |
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VIII/H.10-100 Tobelite (NH4,K)Al2(Si3Al)O10(OH)2 C 2/m 2/m |
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VIII/H.10-110 Nanpingite Cs(Al,Mg,Fe,Li)2(Si3Al)O10(OH,F)2 C 2/c 2/m |
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Other Paragonite Information
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References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
See Also: |
Links to other databases for Paragonite :
1 -Am. Min. Crystal Structure Database
2 -Athena
3 - Crocoite.com Mineral Locations
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 - UCLA - Petrography Thin-Sections
14 - WWW-MINCRYST
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Paragonite
NaAl2(Si3Al)O10(OH)2
Dana No: 71.2.2a.2 Strunz No: VIII/H.10-50
Locality:
Notes:
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