Mineralogy Database

Cassagnaite Mineral Data

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General Cassagnaite Information

Help on Chemical  Formula: Chemical Formula: (Ca,Mn++)4(Fe+++,Mn+++,Al)4(OH)4(V+++,Mg,Al)2(O,OH)4(Si3O10)(SiO4)2
Help on Composition: Composition: Molecular Weight = 996.28 gm
   Calcium    13.28 %  Ca   18.57 % CaO
   Magnesium   1.46 %  Mg    2.43 % MgO
   Manganese  11.58 %  Mn    4.98 % MnO / 11.09 % Mn2O3
   Aluminum    4.06 %  Al    7.68 % Al2O3
   Vanadium    3.58 %  V     5.27 % V2O3
   Iron        8.97 %  Fe   12.82 % Fe2O3
   Silicon    14.66 %  Si   31.36 % SiO2
   Hydrogen    0.66 %  H     5.88 % H2O
   Oxygen     41.75 %  O
             ______        ______ 
             100.00 %      100.08 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca3.3Mn2+0.7Fe3+1.6Mn3+1.4Al1.5V3+0.7Mg0.6Si5.2O26H6.5
Help on Environment: Environment: Found in fractures in braunite + quartz layered mineralization, together with piemontite.
Help on IMA Status: IMA Status: Approved IMA 2006 (Dana # Added)
Help on Locality: Locality: Cassagna mine, Val Graveglia, eastern Liguria, northern Apennines, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the locality.
Help on Synonym: Synonym: IMA2006-019a

Cassagnaite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.6809:1:2.1323
Help on Cell Dimensions: Cell Dimensions: a = 6.066, b = 8.908, c = 18.995, Z = 2; V = 1,026.41 Den(Calc)= 3.22
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: C mcm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 9.52(1), 2.66(0.7), 2.54(0.6),3.02(0.6), 4.85(0.5), 4.98(0.45), 2.32(0.4), 4.03(0.4),

Physical Properties of Cassagnaite

Help on Cleavage: Cleavage: {001} Distinct
Help on Color: Color: Golden brown.
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: nearly white

Optical Properties of Cassagnaite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.028 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.25,KC= 0.2432
Ncalc = 1.78
Help on Optical Data: Optical Data: Biaxial (?), a=1.8, g=1.81, bire=0.0100

Calculated Properties of Cassagnaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.17 gm/cc
note: Specific Gravity of Cassagnaite =3.22 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PECassagnaite = 8.62 barns/electron
U=PECassagnaite x rElectron Density= 27.30 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Cassagnaite is Not Radioactive

Cassagnaite Classification

Help on  Dana Class: Dana Class: (57)Sorosilicate Insular Si3O10 and Larger Noncyclic Groups
  (57.02)with [Si4O13] groups
  (57.02.03)Akatoreite Group Akatoreite (Mn,Fe)9Al2Si8O24(OH)8 P1 1 Hubeite! Ca2MnFeSi4O12(OH)(H2O)2 P1 1 Cassagnaite! (Ca,Mn)4(Fe,Mn,Al)4(OH)4(V,Mg,Al)2(O,OH)4(Si3O10)(SiO4)2 C mcm 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.BJ.65 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BJ -Sorosilicates with Si3O10, Si4O11, etc
09.BJ.65 Cassagnaite! (Ca,Mn)4(Fe,Mn,Al)4(OH)4(V,Mg,Al)2(O,OH)4(Si3O10)(SiO4)2 C mcm 2/m 2/m 2/m

Other Cassagnaite Information

Help on References: References: NAME( AmMin, v93:1686) PHYS. PROP.(AmMin, v93:1686) OPTIC PROP.(AmMin, v93:1686)
Help on See Also: See Also: Links to other databases for Cassagnaite :
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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Dana No: Strunz No: 09.BJ.65





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