Cerchiaraite Mineral Data

Cerchiaraite Mineral Data

General Cerchiaraite Information

Chemical Formula:

Ba4(Mn,Fe,Al)4Si6(O,OH,Cl)26

Composition:

Molecular Weight = 1,398.66 gm

Barium 39.27 % Ba 43.85 % BaO

Manganese 13.35 % Mn 17.24 % MnO

Aluminum 0.58 % Al 1.09 % Al₂O₃

Iron 1.60 % Fe 2.05 % FeO

Silicon 12.05 % Si 25.77 % SiO₂

Hydrogen 0.52 % H 4.64 % H₂O

Chlorine 3.80 % Cl 3.80 % Cl

- % Cl -0.86 % -O=Cl₂

Oxygen 28.83 % O

______ ______

100.00 % 97.60 % = TOTAL OXIDE

Empirical Formula:

Ba₄Mn²⁺_3.4Fe²⁺_0.4Al_0.3Si₆O₁₈(OH)_7.2Cl_1.5

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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Cerchiaraite Crystallography

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

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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

Physical Properties of Cerchiaraite

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

Optical Properties of Cerchiaraite

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.

Calculated Properties of Cerchiaraite

Electron Density:

r_electron=3.44 gm/cc
note: r_Cerchiaraite=3.75 gm/cc.

Fermion Index

Fermion Index = 0.07609
Boson Index = 0.92391

Photoelectric:

PE_Cerchiaraite= 176.49 barns/electron
U=PE_Cerchiaraite x r_electron= 607.19 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Cerchiaraite is Not Radioactive

Cerchiaraite Classification

Dana Class:

62.1.1.2 (62)Cyclosilicate Eight-Membered Rings

(62.1)with 8-memebered and larger rings

(62.1.1)Dana Group

62.1.1.1 Muirite Ba10Ca2MnTiSi10O30(OH,Cl,F)10 P 4/mmm 4/m 2/m 2/m

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

VIII/E - Cyklosilicates, quadruplet rings [Si4O11]8-

VIII/E.08 - Joaquinite group, Baotite - Orthojoaquinite-(Ce) series

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

VIII/E.08-10 Baotite Ba4(Ti,Nb)8Si4O28Cl I 4₁/a 4/m

VIII/E.08-15 Cerchiaraite Ba4(Mn,Fe,Al)4Si6(O,OH,Cl)26 I 4/mmm 4/m 2/m 2/m

VIII/E.08-20 Titantaramellite Ba4(Ti,Fe,Fe,Mg)4(B2Si8O27)O2ClxX=0TO1,withTi>Fe Pmmn 2/m 2/m 2/m

VIII/E.08-30 Taramellite Ba4(Fe,Ti,Fe,Mg)4(B2Si8O27)O2Clx(x=0to1) Pmmn 2/m 2/m 2/m

VIII/E.08-40 Nagashimalite Ba4(V,Ti)4Si8B2O27Cl(O,OH)2 Pmmn 2/m 2/m 2/m

VIII/E.08-50 Strontiojoaquinite (Na,Fe)2Ba2Sr2Ti2[Si4O12]2(O,OH)2·(H2O) C 2 2

VIII/E.08-60 Strontio-orthojoaquinite (Na,Fe)2Ba2Sr2Ti2[Si4O12]2(O,OH)2·(H2O) Pbcm or Pbc2 Ortho

VIII/E.08-70 Bario-orthojoaquinite Fe2(Ba,Sr)4Ti2[Si4O12]O2·(H2O) Ccmm or Ccm2 Ortho

VIII/E.08-80 Joaquinite-(Ce) NaFeBa2Ce2(Ti,Nb)2[Si4O12]2O2(OH,F)·(H2O) C 2 2

VIII/E.08-89 Orthojoaquinite-(La)! Ba2Na(La,Ce)2FeTi2Si8O26(OH,O,F)·H2O Ccmm 2/m 2/m 2/m

VIII/E.08-90 Orthojoaquinite-(Ce) NaFeBa2Ce2Ti2[Si4O12]2O2(OH)·(H2O) Ccmm or Ccm21 Ortho

Other Cerchiaraite Information

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: