Cerchiaraite Mineral Data (original) (raw)

General Cerchiaraite Information

Help on Chemical Formula: Chemical Formula:

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

Help on Composition: 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

Help on Empirical Formula: Empirical Formula:

Ba4Mn2+3.4Fe2+0.4Al0.3Si6O18(OH)7.2Cl1.5

Help on Environment: Environment:

Individual grains in fractures.

Help on IMA Status: IMA Status:

Approved IMA 1999 (Dana # Added)

Help on Locality: Locality:

Cerchiara manganese (braunite) mine, Val di Vara, eastern Liguria, Italy. Link to MinDat.org Location Data.

Help on Name Origin: Name Origin:

Named for the locality.

Help on Synonym: Synonym:

IMA1999-012

Cerchiaraite Image

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Cerchiaraite Crystallography

Help on Axial Ratios: Axial Ratios:

a:c = 1:0.43095

Help on Cell Dimensions: Cell Dimensions:

a = 14.215, c = 6.126, Z = 2; V = 1,237.86 Den(Calc)= 3.75

Help on Crystal System: 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/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),

Click Here for Large Cerchiaraite Structure Window Crystal Structure:

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Help on Above

| | 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

Help on Cleavage: Cleavage:

None

Help on Color: Color:

Deep green.

Help on Diaphaneity: Diaphaneity:

Transparent

Help on Fracture: Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Help on Habit: Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Help on Habit: Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Help on Habit: Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Help on Hardness: Hardness:

4-5 - Fluorite-Apatite

Help on Luster: Luster:

Vitreous (Glassy)

Help on Streak: Streak:

pale green

Optical Properties of Cerchiaraite

Help on Gladstone-Dale: Gladstone-Dale:

CI calc= -0.134 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2013,KC= 0.1776
Ncalc = 1.67

Help on Optical Data: Optical Data:

Uniaxial (+), w=1.745, e=1.765, bire=0.0200.

Calculated Properties of Cerchiaraite

Help on Electron Density: Electron Density:

Bulk Density (Electron Density)=3.44 gm/cc
note: Specific Gravity of Cerchiaraite =3.75 gm/cc.

Help on Fermion Index: Fermion Index:

Fermion Index = 0.07
Boson Index = 0.93

Help on Photoelectric: Photoelectric:

PECerchiaraite = 176.49 barns/electron
U=PECerchiaraite x rElectron Density= 607.19 barns/cc.

Help on Radioactivity: Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Cerchiaraite is Not Radioactive

Cerchiaraite Classification

Help on Dana Class: Dana Class:

62.01.01.02 (62)Cyclosilicate Eight-Membered Rings

(62.01)with 8-memebered and larger rings

(62.01.01)Muirite Group

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

62.01.01.02 Cerchiaraite! Ba4(Mn,Fe,Al)4Si6(O,OH,Cl)26 I 4/mmm 4/m 2/m 2/m

Help on Strunz Class: Strunz Class:

09.CF.25 09 - SILICATES (Germanates)

09.C - Cyclosilicates

09.CF -[Si4O12]8- 4-membered single rings, with insular complex anions

09.CF.25 Cerchiaraite! Ba4(Mn,Fe,Al)4Si6(O,OH,Cl)26 I 4/mmm 4/m 2/m 2/m

Other Cerchiaraite Information

Help on References: References:

NAME( AmMin, Vol 86) PHYS. PROP.(AmMin, Vol 86) OPTIC PROP.(AmMin, Vol 86)

Help on See Also: See Also:

Links to other databases for Cerchiaraite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Ask about Cerchiaraite here :
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Print or Cut-and-Paste your Cerchiaraite Specimen Label here :

Cerchiaraite

Ba4(Mn,Fe,Al)4Si6(O,OH,Cl)26
Dana No: 62.01.01.02 Strunz No: 09.CF.25
Locality:

Notes: