|
|
Magnesiofoitite Mineral Data
|
|
|
General Magnesiofoitite Information
|
Chemical Formula: |
[ ](Mg2Al)Al6(Si6O18)(BO3)3(OH)4 |
Composition: |
Molecular Weight = 937.08 gm |
|
Magnesium 3.89 % Mg 6.45 % MgO |
|
Aluminum 21.31 % Al 40.26 % Al2O3 |
|
Silicon 17.98 % Si 38.47 % SiO2 |
|
Boron 3.46 % B 11.14 % B2O3 |
|
Hydrogen 0.43 % H 3.84 % H2O |
|
Oxygen 52.93 % O |
|
______ ______ |
|
100.00 % 100.17 % = TOTAL OXIDE |
Empirical Formula: |
Mg1.5Al7.4Si6O18(BO3)3(OH)4 |
Environment: |
Found in a hydrothermally altered quartz-phenocryst-bearing porphyry. The Mg analogue of foitite. |
IMA Status: |
Approved IMA 2001 (Dana # Added) |
Locality: |
Kyonosawa, Mitomi-mura, Higashi-Yamanashi-gun, Yamanashi-ken Prefecture, Honshu, Japan. Link to MinDat.org Location Data. |
Name Origin: |
The name recalls its composition and relationship to foitite. |
Synonym: |
IMA1998-037 |
|
Magnesiofoitite Image |
Images:
|
|
Magnesiofoitite
Comments: Aggregate of greenish-brown acicular crystals of magnesiofoitite.
Location: Kyonosawa, Mitomi-mura, Yamanashi prefecture, Chubu region, Honshu island, Japan.
Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag |
|
Magnesiofoitite Crystallography
|
Axial Ratios: |
a:c = 1:0.4519 |
Cell Dimensions: |
a = 15.884, c = 7.178, Z = 3; V = 1,568.39 Den(Calc)= 2.98 |
Crystal System: |
Trigonal - Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m |
X Ray Diffraction: |
By Intensity(I/Io): 2.567(1)(051), 3.969(1)(220), 4.211(0.9)(211),2.949(0.7)(122), 3.47(0.6)(012), 6.366(0.6)(101), 2.037(0.5)(152), |
|
Physical Properties of Magnesiofoitite
|
Cleavage: |
None |
Color: |
Pale bluish gray. |
Diaphaneity: |
Transparent |
Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. |
Habit: |
Felted - Occurs as minute crystalling aggregates with the form of felt material. |
Habit: |
Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite) |
Hardness: |
7 - Quartz |
Luster: |
Earthy (Dull) |
Streak: |
white |
|
Optical Properties of Magnesiofoitite
|
Gladstone-Dale: |
CI calc= -0.002 (Superior) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2138,KC= 0.2133 Ncalc = 1.64 |
Optical Data: |
Uniaxial (-), e=1.624, w=1.65, bire=0.0260. |
|
Calculated Properties of Magnesiofoitite
|
Electron Density: |
Bulk Density (Electron Density)=2.96 gm/cc note: Specific Gravity of Magnesiofoitite =2.98 gm/cc. |
Fermion Index: |
Fermion Index = 0.01 Boson Index = 0.99 |
Photoelectric: |
PEMagnesiofoitite = 1.45 barns/electron U=PEMagnesiofoitite x rElectron Density= 4.28 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Magnesiofoitite is Not Radioactive |
|
Magnesiofoitite Classification
|
Dana Class: |
61.03a.01.02 (61)Cyclosilicate Six-Membered Rings |
|
(61.03a)with borate groups (Alkali-Deficient Tourmaline Subgroup) |
|
(61.03a.01)Foitite Subgroup |
|
61.03a.01.01 Foitite! []Na<0.5(Fe,Al)3Al6Si6O18(BO3)3(OH)4 R 3m 3m |
|
61.03a.01.02 Magnesiofoitite! [](Mg2Al)Al6(Si6O18)(BO3)3(OH)4 R 3m 3m |
|
61.03a.01.03 Rossmanite! []LiAl2Al6(Si6O18)(BO3)3(OH)4 R 3m 3m |
Strunz Class: |
09.CK.05 09 - SILICATES (Germanates) |
|
09.C - Cyclosilicates |
|
09.CK -[Si6O18]12- 6-membered single rings, with insular complex anions |
|
09.CK.05 Chromdravite! NaMg3(Cr,Fe)6(BO3)3Si6O18(OH)4 R 3m 3m |
|
09.CK.05 Feruvite! (Ca,Na)(Fe,Mg,Ti)3(Al,Mg,Fe)6(BO3)3Si6O18(OH)4 R 3m 3m |
|
09.CK.05 Dravite NaMg3Al6(BO3)3Si6O18(OH)4 R 3m 3m |
|
09.CK.05 Buergerite! NaFe3Al6(BO3)3Si6O21F R 3m 3m |
|
09.CK.05 Foitite! []Na<0.5(Fe,Al)3Al6Si6O18(BO3)3(OH)4 R 3m 3m |
|
09.CK.05 Liddicoatite! Ca(Li,Al)3Al6(BO3)3Si6O18(O,OH,F)4 R 3m 3m |
|
09.CK.05 Elbaite Na(Li,Al)3Al6(BO3)3Si6O18(OH)4 R 3m 3m |
|
09.CK.05 Rossmanite! []LiAl2Al6(Si6O18)(BO3)3(OH)4 R 3m 3m |
|
09.CK.05 Olenite! NaAl3Al6(BO3)3(Si6O18)(O,OH)4 R 3m 3m |
|
09.CK.05 Povondraite! (Na,K)(Fe,Fe)3(Fe,Mg,Al)6(BO3)3Si6O18(OH)4 R 3m 3m |
|
09.CK.05 Schorl NaFe3Al6(BO3)3Si6O18(OH)4 R 3m 3m |
|
09.CK.05 Uvite (Ca,Na)(Mg,Fe)3Al5Mg(BO3)3Si6O18(OH,F)4 R 3m 3m |
|
09.CK.05 Vanadiumdravite! NaMg3V6(Si6O18)(BO3)3(OH)4 R 3m 3m |
|
09.CK.05 Magnesiofoitite! [](Mg2Al)Al6(Si6O18)(BO3)3(OH)4 R 3m 3m |
|
09.CK.05 Hydroxyuvite! CaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3(OH) R 3m 3m |
|
09.CK.05 Schorl-(F)! NaFe3Al6Si6O18)(BO3)3(OH)3(F,OH) R 3m 3m |
|
Other Magnesiofoitite Information
|
References: |
NAME( CanMin) PHYS. PROP.(AmMin, Vol 85, p 1562) OPTIC PROP.(AmMin, Vol 85, p 1562) |
See Also: |
Links to other databases for Magnesiofoitite :
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 Magnesiofoitite using:
[AOL]
[Bing]
[Dog Pile]
[GeoScienceWorld]
[HotBot]
[Ixquick]
[Lycos]
[MAMMA]
[Scirus]
[Teoma]
[WebCrawler]
[Wikipedia]
[YAHOO]
Visit our Advertisers for Magnesiofoitite :
Ask about Magnesiofoitite 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
Espa�ol
Print or Cut-and-Paste your Magnesiofoitite Specimen Label here :
Magnesiofoitite
[ ](Mg2Al)Al6(Si6O18)(BO3)3(OH)4
Dana No: 61.03a.01.02 Strunz No: 09.CK.05
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.