Magnesiofoitite Mineral Data (original) (raw)

General Magnesiofoitite Information

Help on Chemical Formula: Chemical Formula:

[ ](Mg2Al)Al6(Si6O18)(BO3)3(OH)4

Help on Composition: 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

Help on Empirical Formula: Empirical Formula:

Mg1.5Al7.4Si6O18(BO3)3(OH)4

Help on Environment: Environment:

Found in a hydrothermally altered quartz-phenocryst-bearing porphyry. The Mg analogue of foitite.

Help on IMA Status: IMA Status:

Approved IMA 2001 (Dana # Added)

Help on Locality: Locality:

Kyonosawa, Mitomi-mura, Higashi-Yamanashi-gun, Yamanashi-ken Prefecture, Honshu, Japan. Link to MinDat.org Location Data.

Help on Name Origin: Name Origin:

The name recalls its composition and relationship to foitite.

Help on Synonym: Synonym:

IMA1998-037

Magnesiofoitite Image

Click Here for Larger Magnesiofoitite Image in a New Browser Window Images:

Click Here for Larger Magnesiofoitite Image 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

Help on Axial Ratios: Axial Ratios:

a:c = 1:0.4519

Help on Cell Dimensions: Cell Dimensions:

a = 15.884, c = 7.178, Z = 3; V = 1,568.39 Den(Calc)= 2.98

Help on Crystal System: Crystal System:

Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: R 3m

Help on X Ray Diffraction: 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

Help on Cleavage: Cleavage:

None

Help on Color: Color:

Pale bluish gray.

Help on Diaphaneity: Diaphaneity:

Transparent

Help on Fracture: Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Help on Habit: Habit:

Felted - Occurs as minute crystalling aggregates with the form of felt material.

Help on Habit: Habit:

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

Help on Hardness: Hardness:

7 - Quartz

Help on Luster: Luster:

Earthy (Dull)

Help on Streak: Streak:

white

Optical Properties of Magnesiofoitite

Help on Gladstone-Dale: Gladstone-Dale:

CI calc= -0.002 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2138,KC= 0.2133
Ncalc = 1.64

Help on Optical Data: Optical Data:

Uniaxial (-), e=1.624, w=1.65, bire=0.0260.

Calculated Properties of Magnesiofoitite

Help on Electron Density: Electron Density:

Bulk Density (Electron Density)=2.96 gm/cc
note: Specific Gravity of Magnesiofoitite =2.98 gm/cc.

Help on Fermion Index: Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Help on Photoelectric: Photoelectric:

PEMagnesiofoitite = 1.45 barns/electron
U=PEMagnesiofoitite x rElectron Density= 4.28 barns/cc.

Help on Radioactivity: Radioactivity:

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

Magnesiofoitite Classification

Help on Dana Class: 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

Help on Strunz Class: 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

Help on References: References:

NAME( CanMin) PHYS. PROP.(AmMin, Vol 85, p 1562) OPTIC PROP.(AmMin, Vol 85, p 1562)

Help on See Also: 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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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: