| |
 |
Cassagnaite Mineral Data
|
|
|
General Cassagnaite Information
|
 Chemical Formula: |
(Ca,Mn++)4(Fe+++,Mn+++,Al)4(OH)4(V+++,Mg,Al)2(O,OH)4(Si3O10)(SiO4)2 |
| 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 |
| Empirical Formula: |
Ca3.3Mn2+0.7Fe3+1.6Mn3+1.4Al1.5V3+0.7Mg0.6Si5.2O26H6.5 |
| Environment: |
Found in fractures in braunite + quartz layered mineralization, together with piemontite. |
| IMA Status: |
Approved IMA 2006 (Dana # Added) |
| Locality: |
Cassagna mine, Val Graveglia, eastern Liguria, northern Apennines, Italy. Link to MinDat.org Location Data. |
| Name Origin: |
Named after the locality. |
| Synonym: |
IMA2006-019a |
| |
Cassagnaite Crystallography
|
| Axial Ratios: |
a:b:c =0.6809:1:2.1323 |
| Cell Dimensions: |
a = 6.066, b = 8.908, c = 18.995, Z = 2; V = 1,026.41 Den(Calc)= 3.22 |
| Crystal System: |
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: C mcm |
| 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
|
| Cleavage: |
{001} Distinct |
| Color: |
Golden brown. |
| Diaphaneity: |
Transparent |
| Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. |
| Habit: |
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). |
| Habit: |
Tabular - Form dimensions are thin in one direction. |
| Luster: |
Vitreous (Glassy) |
| Streak: |
nearly white |
| |
Optical Properties of Cassagnaite
|
| Gladstone-Dale: |
CI calc= -0.028 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.25,KC= 0.2432
Ncalc = 1.78 |
| Optical Data: |
Biaxial (?), a=1.8, g=1.81, bire=0.0100 |
| |
Calculated Properties of Cassagnaite
|
| Electron Density: |
Bulk Density (Electron Density)=3.17 gm/cc
note: Specific Gravity of Cassagnaite =3.22 gm/cc.
|
| Fermion Index: |
Fermion Index = 0.01
Boson Index = 0.99 |
| Photoelectric: |
PECassagnaite = 8.62 barns/electron
U=PECassagnaite x rElectron Density= 27.30 barns/cc.
|
| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Cassagnaite is Not Radioactive |
| |
Cassagnaite Classification
|
| Dana Class: |
57.02.03.03 (57)Sorosilicate Insular Si3O10 and Larger Noncyclic Groups |
| |
(57.02)with [Si4O13] groups |
| |
(57.02.03)Akatoreite Group |
| |
57.02.03.01 Akatoreite (Mn,Fe)9Al2Si8O24(OH)8 P1 1 |
| |
57.02.03.02 Hubeite! Ca2MnFeSi4O12(OH)(H2O)2 P1 1 |
| |
57.02.03.03 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 |
| 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
|
| References: |
NAME( AmMin, v93:1686) PHYS. PROP.(AmMin, v93:1686) OPTIC PROP.(AmMin, v93:1686) |
| 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
Search for Cassagnaite using:
[AOL]
[Bing]
[Dog Pile]
[GeoScienceWorld]
[HotBot]
[Ixquick]
[Lycos]
[MAMMA]
[Scirus]
[Teoma]
[WebCrawler]
[Wikipedia]
[YAHOO]
Visit our Advertisers for Cassagnaite :
Ask about Cassagnaite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in
Espaņol
Print or Cut-and-Paste your Cassagnaite Specimen Label here :
|
Cassagnaite
(Ca,Mn++)4(Fe+++,Mn+++,Al)4(OH)4(V+++,Mg,Al)2(O,OH)4(Si3O10)(SiO4)2
Dana No: 57.02.03.03 Strunz No: 09.BJ.65
Locality:
Notes:
|
|
| |
| |
|
| |
Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.