General Cerchiaraite Information
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Chemical Formula: |
Ba4(Mn,Fe,Al)4Si6(O,OH,Cl)26 |
Composition: |
Molecular Weight = 1,398.66 gm |
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Barium 39.27 % Ba 43.85 % BaO |
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Manganese 13.35 % Mn 17.24 % MnO |
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Aluminum 0.58 % Al 1.09 % Al2O3 |
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Iron 1.60 % Fe 2.05 % FeO |
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Silicon 12.05 % Si 25.77 % SiO2 |
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Hydrogen 0.52 % H 4.64 % H2O |
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Chlorine 3.80 % Cl 3.80 % Cl |
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- % Cl -0.86 % -O=Cl2 |
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Oxygen 28.83 % O |
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______ ______ |
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100.00 % 97.60 % = TOTAL OXIDE |
Empirical Formula: |
Ba4Mn2+3.4Fe2+0.4Al0.3Si6O18(OH)7.2Cl1.5 |
Environment: |
Individual grains in fractures. |
IMA Status: |
Approved IMA 1999 (Dana # Added) |
Locality: |
Cerchiara manganese (braunite) mine, Val di Vara, eastern Liguria, Italy. Link to MinDat.org Location Data. |
Name Origin: |
Named for the locality. |
Synonym: |
IMA1999-012 |
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Search for Cerchiaraite Images |
Images:
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Cerchiaraite Crystallography
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Axial Ratios: |
a:c = 1:0.43095 |
Cell Dimensions: |
a = 14.215, c = 6.126, Z = 2; V = 1,237.86 Den(Calc)= 3.75 |
Crystal System: |
Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: I 4/mmm |
X Ray Diffraction: |
By Intensity(I/Io): 3.011(1)(411), 10.15(0.88)(110), 3.319(0.75)(321),2.619(0.74)(222), 2.577(0.62)(501), 5.63(0.5)(101), 4.417(0.49)(211), |
Crystal Structure:
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Basso R , Lucchetti G , Zefiro L , Palenzona A , Neues Jahrbuch fur Mineralogie, Monatshefte , 2000 (2000) p.373-384, Cerchiaraite, a new natural Ba-Mn-mixed-anion silicate chloride from, the Cerchiara mine, northern Apennines, Italy, Locality: Cerchiara mine, Va di Vara, northern Apennines, Italy
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Physical Properties of Cerchiaraite
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Cleavage: |
None |
Color: |
Deep green. |
Diaphaniety: |
Transparent |
Fracture: |
Brittle - Uneven - Very brittle fracture producing uneven fragments. |
Habit: |
Granular - Generally occurs as anhedral to subhedral crystals in matrix. |
Habit: |
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). |
Habit: |
Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite) |
Hardness: |
4-5 - Fluorite-Apatite |
Luster: |
Vitreous (Glassy) |
Streak: |
pale green |
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Optical Properties of Cerchiaraite
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Gladstone-Dale: |
CI calc= -0.134 (Poor) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2013,KC= 0.1776 |
Optical Data: |
Uniaxial (+), w=1.745, e=1.765, bire=0.0200. |
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Calculated Properties of Cerchiaraite
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Electron Density: |
relectron=3.44 gm/cc note: rCerchiaraite =3.75 gm/cc. |
Fermion Index |
Fermion Index = 0.07609 Boson Index = 0.92391 |
Photoelectric: |
PECerchiaraite = 176.49 barns/electron U=PECerchiaraite x relectron= 607.19 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Cerchiaraite is Not Radioactive |
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Cerchiaraite Classification
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Dana Class: |
62.1.1.2 (62)Cyclosilicate Eight-Membered Rings |
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(62.1)with 8-memebered and larger rings |
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(62.1.1)Dana Group |
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62.1.1.1 Muirite Ba10Ca2MnTiSi10O30(OH,Cl,F)10 P 4/mmm 4/m 2/m 2/m |
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62.1.1.2 Cerchiaraite ! Ba4(Mn,Fe,Al)4Si6(O,OH,Cl)26 I 4/mmm 4/m 2/m 2/m |
Strunz Class: |
VIII/E.08-15 VIII - Silicates |
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VIII/E - Cyklosilicates, quadruplet rings [Si4O11]8- |
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VIII/E.08 - Joaquinite group, Baotite - Orthojoaquinite-(Ce) series |
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VIII/E.08-05 Verplanckite Ba2(Mn,Ti,Fe)2Si2O6(O,OH,Cl,F)2·3(H2O) P 6/mmm 6/m 2/m 2/m |
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VIII/E.08-10 Baotite Ba4(Ti,Nb)8Si4O28Cl I 41/a 4/m |
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VIII/E.08-15 Cerchiaraite Ba4(Mn,Fe,Al)4Si6(O,OH,Cl)26 I 4/mmm 4/m 2/m 2/m |
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VIII/E.08-20 Titantaramellite Ba4(Ti,Fe,Fe,Mg)4(B2Si8O27)O2ClxX=0TO1,withTi>Fe Pmmn 2/m 2/m 2/m |
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VIII/E.08-30 Taramellite Ba4(Fe,Ti,Fe,Mg)4(B2Si8O27)O2Clx(x=0to1) Pmmn 2/m 2/m 2/m |
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VIII/E.08-40 Nagashimalite Ba4(V,Ti)4Si8B2O27Cl(O,OH)2 Pmmn 2/m 2/m 2/m |
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VIII/E.08-50 Strontiojoaquinite (Na,Fe)2Ba2Sr2Ti2[Si4O12]2(O,OH)2·(H2O) C 2 2 |
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VIII/E.08-60 Strontio-orthojoaquinite (Na,Fe)2Ba2Sr2Ti2[Si4O12]2(O,OH)2·(H2O) Pbcm or Pbc2 Ortho |
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VIII/E.08-70 Bario-orthojoaquinite Fe2(Ba,Sr)4Ti2[Si4O12]O2·(H2O) Ccmm or Ccm2 Ortho |
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VIII/E.08-80 Joaquinite-(Ce) NaFeBa2Ce2(Ti,Nb)2[Si4O12]2O2(OH,F)·(H2O) C 2 2 |
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VIII/E.08-89 Orthojoaquinite-(La)! Ba2Na(La,Ce)2FeTi2Si8O26(OH,O,F)·H2O Ccmm 2/m 2/m 2/m |
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VIII/E.08-90 Orthojoaquinite-(Ce) NaFeBa2Ce2Ti2[Si4O12]2O2(OH)·(H2O) Ccmm or Ccm21 Ortho |
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Other Cerchiaraite Information
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References: |
NAME( AmMin, Vol 86) PHYS. PROP.(AmMin, Vol 86) OPTIC PROP.(AmMin, Vol 86) |
See Also: |
Links to other databases for Cerchiaraite :
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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Cerchiaraite
Ba4(Mn,Fe,Al)4Si6(O,OH,Cl)26
Dana No: 62.1.1.2 Strunz No: VIII/E.08-15
Locality:
Notes:
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