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Magnesiofoitite Mineral Data
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General Magnesiofoitite Information
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 Chemical Formula: |
[ ](Mg2Al)Al6(Si6O18)(BO3)3(OH)4 |
| Composition: |
Molecular Weight = 937.08 gm |
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Magnesium 3.89 % Mg 6.45 % MgO |
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Aluminum 21.31 % Al 40.26 % Al2O3 |
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Silicon 17.98 % Si 38.47 % SiO2 |
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Boron 3.46 % B 11.14 % B2O3 |
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Hydrogen 0.43 % H 3.84 % H2O |
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Oxygen 52.93 % O |
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______ ______ |
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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 |
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Magnesiofoitite Image |
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Images:
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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 |
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Magnesiofoitite Crystallography
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| 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), |
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Physical Properties of Magnesiofoitite
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| 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 |
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Optical Properties of Magnesiofoitite
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| 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. |
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Calculated Properties of Magnesiofoitite
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| Electron Density: |
Bulk Density (Electron Density)=2.96 gm/cc
note: Specific Gravity of Magnesiofoitite =2.98 gm/cc.
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| 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.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Magnesiofoitite is Not Radioactive |
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Magnesiofoitite Classification
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| Dana Class: |
61.03a.01.02 (61)Cyclosilicate Six-Membered Rings |
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(61.03a)with borate groups (Alkali-Deficient Tourmaline Subgroup) |
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(61.03a.01)Foitite Subgroup |
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61.03a.01.01 Foitite! []Na<0.5(Fe,Al)3Al6Si6O18(BO3)3(OH)4 R 3m 3m |
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61.03a.01.02 Magnesiofoitite! [](Mg2Al)Al6(Si6O18)(BO3)3(OH)4 R 3m 3m |
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61.03a.01.03 Rossmanite! []LiAl2Al6(Si6O18)(BO3)3(OH)4 R 3m 3m |
| Strunz Class: |
09.CK.05 09 - SILICATES (Germanates) |
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09.C - Cyclosilicates |
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09.CK -[Si6O18]12- 6-membered single rings, with insular complex anions |
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09.CK.05 Chromdravite! NaMg3(Cr,Fe)6(BO3)3Si6O18(OH)4 R 3m 3m |
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09.CK.05 Feruvite! (Ca,Na)(Fe,Mg,Ti)3(Al,Mg,Fe)6(BO3)3Si6O18(OH)4 R 3m 3m |
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09.CK.05 Dravite NaMg3Al6(BO3)3Si6O18(OH)4 R 3m 3m |
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09.CK.05 Buergerite! NaFe3Al6(BO3)3Si6O21F R 3m 3m |
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09.CK.05 Foitite! []Na<0.5(Fe,Al)3Al6Si6O18(BO3)3(OH)4 R 3m 3m |
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09.CK.05 Liddicoatite! Ca(Li,Al)3Al6(BO3)3Si6O18(O,OH,F)4 R 3m 3m |
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09.CK.05 Elbaite Na(Li,Al)3Al6(BO3)3Si6O18(OH)4 R 3m 3m |
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09.CK.05 Rossmanite! []LiAl2Al6(Si6O18)(BO3)3(OH)4 R 3m 3m |
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09.CK.05 Olenite! NaAl3Al6(BO3)3(Si6O18)(O,OH)4 R 3m 3m |
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09.CK.05 Povondraite! (Na,K)(Fe,Fe)3(Fe,Mg,Al)6(BO3)3Si6O18(OH)4 R 3m 3m |
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09.CK.05 Schorl NaFe3Al6(BO3)3Si6O18(OH)4 R 3m 3m |
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09.CK.05 Uvite (Ca,Na)(Mg,Fe)3Al5Mg(BO3)3Si6O18(OH,F)4 R 3m 3m |
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09.CK.05 Vanadiumdravite! NaMg3V6(Si6O18)(BO3)3(OH)4 R 3m 3m |
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09.CK.05 Magnesiofoitite! [](Mg2Al)Al6(Si6O18)(BO3)3(OH)4 R 3m 3m |
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09.CK.05 Hydroxyuvite! CaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3(OH) R 3m 3m |
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09.CK.05 Schorl-(F)! NaFe3Al6Si6O18)(BO3)3(OH)3(F,OH) R 3m 3m |
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Other Magnesiofoitite Information
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| 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
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Magnesiofoitite
[ ](Mg2Al)Al6(Si6O18)(BO3)3(OH)4
Dana No: 61.03a.01.02 Strunz No: 09.CK.05
Locality:
Notes:
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