General Eastonite Information
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Chemical Formula: |
KMg2Al[Al2Si2O10](OH)2 |
Composition: |
Molecular Weight = 418.83 gm |
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Potassium 9.34 % K 11.25 % K2O |
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Magnesium 11.61 % Mg 19.25 % MgO |
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Aluminum 19.33 % Al 36.52 % Al2O3 |
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Silicon 13.41 % Si 28.69 % SiO2 |
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Hydrogen 0.48 % H 4.30 % H2O |
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Oxygen 45.84 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
KMg2Al3Si2O10(OH)2 |
Environment: |
Forms a series with siderophyllite and other biotite group micas. |
IMA Status: |
Approved IMA 1998 (Dana # Added) |
Locality: |
Easton, Pennsylvania, USA Link to MinDat.org Location Data. |
Name Origin: |
Named for the locality. |
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Eastonite Image |
Images:
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Eastonite Crystallography
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Crystal System: |
Monoclinic - PrismaticH-M Symbol (2/m) |
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Calculated Properties of Eastonite
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Fermion Index |
Fermion Index = 0.0181 Boson Index = 0.9819 |
Photoelectric: |
PEEastonite = 2.27 barns/electron U=PEEastonite x relectron= . barns/cc. |
Radioactivity: |
GRapi = 133.80 (Gamma Ray American Petroleum Institute Units)
Estimated Radioactivity from Eastonite - barely detectable
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Eastonite Classification
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Dana Class: |
71.2.2b.5a (71)Phyllosilicate Sheets of Six-Membered Rings |
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(71.2)with 2:1 Layers |
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(71.2.2b)Mica Group (Biotite subgroup) |
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71.2.2b.1 Phlogopite KMg3(Si3Al)O10(F,OH)2 C 2/m 2/m |
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71.2.2b.1a Tetra-ferriphlogopite! KMg3FeSi3O10(OH)2 2/m |
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71.2.2b.1b Shirozulite! KMn3(AlSi3)O10(OH,F)2 C 2/m 2/m |
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71.2.2b.2 Biotite* K(Mg,Fe)3[AlSi3O10(OH,F)2 C 2/m 2/m |
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71.2.2b.3 Annite KFe3AlSi3O10(OH,F)2 C 2/m 2/m |
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71.2.2b.3a Fluorannite! KFe3AlSi3O10F2 C 2/m 2/m |
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71.2.2b.4 Tetra-ferri-annite K(Fe,Mg)3(Fe,Al)Si3O10(OH)2 C 2/m 2/m |
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71.2.2b.5 Siderophyllite KFe2Al(Al2Si2)O10(F,OH)2 C 2/m 2/m |
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71.2.2b.5a Eastonite ! KMg2Al[Al2Si2O10](OH)2 2/m |
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71.2.2b.6 Hendricksite K(Zn,Mg,Mn)3Si3AlO10(OH)2 C 2/m 2/m |
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71.2.2b.7 Lepidolite K(Li,Al)3(Si,Al)4O10(F,OH)2 C 2/m,Cm Mono |
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71.2.2b.8 Polylithionite KLi2AlSi4O10(F,OH)2 C 2/m 2/m |
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71.2.2b.8a Trilithionite! KLi1.5Al1.5AlSi3O10F2 C 2/m 2/m |
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71.2.2b.8b Sokolovaite! CsLi2AlSi4O10F2 C 2/m, C 2 or Cm Mono |
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71.2.2b.9 Tainiolite KLiMg2Si4O10F2 C 2/m 2/m |
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71.2.2b.10 Zinnwaldite KLiFeAl(AlSi3)O10(F,OH)2 C 2/m 2/m |
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71.2.2b.11 Norrishite K(Mn2Li)Si4O10(O)2 C 2/m 2/m |
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71.2.2b.12 Masutomilite K(Li,Al,Mn)3[(Si,Al)4O10](F,OH)2 C 2/m 2/m |
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71.2.2b.13 Aspidolite NaMg3AlSi3O10(OH)2 C 2/m 2/m |
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71.2.2b.14 Wonesite (Na,K).5(Mg,Fe,Al)3(Si,Al)4O10(OH,F)2 C 2/m 2/m |
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71.2.2b.15 Preiswerkite NaMg2Al3Si2O10(OH)2 C 2/m 2/m |
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71.2.2b.16 Ephesite NaLiAl2(Al2Si2)O10(OH)2 C 2/c 2/m |
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71.2.2b.17 IMA2004-049! NaMg3(AlSi3)O10(OH)2 C 2/m 2/m |
Strunz Class: |
VIII/H.11-150 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.11 - Mica group, Biotite series |
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VIII/H.11-00* Zinnwaldite KLiFeAl(AlSi3)O10(F,OH)2 C 2/m 2/m |
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VIII/H.11-10 Polylithionite KLi2AlSi4O10(F,OH)2 C 2/m 2/m |
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VIII/H.11-20 Tainiolite KLiMg2Si4O10F2 C 2/m 2/m |
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VIII/H.11-30 Norrishite K(Mn2Li)Si4O10(O)2 C 2/m 2/m |
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VIII/H.11-35 Shirokshinite! K(NaMg2)Si4O10F2 C 2/m 2/m |
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VIII/H.11-40 Montdorite (K,Na)(Fe,Mn,Mg)2.5[Si4O10](F,OH)2 C 2/c 2/m |
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VIII/H.11-50 Trilithionite! KLi1.5Al1.5AlSi3O10F2 C 2/m 2/m |
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VIII/H.11-60 Masutomilite K(Li,Al,Mn)3[(Si,Al)4O10](F,OH)2 C 2/m 2/m |
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VIII/H.11-70 Aspidolite NaMg3AlSi3O10(OH)2 C 2/m 2/m |
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VIII/H.11-80 Phlogopite KMg3(Si3Al)O10(F,OH)2 C 2/m 2/m |
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VIII/H.11-90 Tetra-ferriphlogopite! KMg3FeSi3O10(OH)2 2/m |
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VIII/H.11-100 Hendricksite K(Zn,Mg,Mn)3Si3AlO10(OH)2 C 2/m 2/m |
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VIII/H.11-102 Shirozulite! KMn3(AlSi3)O10(OH,F)2 C 2/m 2/m |
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VIII/H.11-105 Fluorannite! KFe3AlSi3O10F2 C 2/m 2/m |
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VIII/H.11-110 Annite KFe3AlSi3O10(OH,F)2 C 2/m 2/m |
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VIII/H.11-120 Tetra-ferri-annite K(Fe,Mg)3(Fe,Al)Si3O10(OH)2 C 2/m 2/m |
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VIII/H.11-130 Ephesite NaLiAl2(Al2Si2)O10(OH)2 C 2/c 2/m |
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VIII/H.11-140 Preiswerkite NaMg2Al3Si2O10(OH)2 C 2/m 2/m |
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VIII/H.11-150 Eastonite KMg2Al[Al2Si2O10](OH)2 2/m |
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VIII/H.11-160 Siderophyllite KFe2Al(Al2Si2)O10(F,OH)2 C 2/m 2/m |
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Other Eastonite Information
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See Also: |
Links to other databases for Eastonite :
1 -Am. Min. Crystal Structure Database
2 -Athena
3 -Google Images
4 -Google Scholar
5 -MinDAT
6 -MinMax(Deutsch)
7 -MinMax(English)
8 -Mineralienatlas (Deutsch)
9 -QUT Mineral Atlas
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Print or Cut-and-Paste your Eastonite Specimen Label here :
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Eastonite
KMg2Al[Al2Si2O10](OH)2
Dana No: 71.2.2b.5a Strunz No: VIII/H.11-150
Locality:
Notes:
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