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Magnesioriebeckite Mineral Data

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General Magnesioriebeckite Information

Help on Chemical  Formula: Chemical Formula: [ ]Na2[(Mg,Fe++)3Fe+++2]Si8O22(OH)2
Help on Composition: Composition: Molecular Weight = 876.08 gm
   Potassium   0.13 %  K     0.16 % K2O
   Sodium      4.09 %  Na    5.52 % Na2O
   Calcium     1.97 %  Ca    2.75 % CaO
   Magnesium   5.35 %  Mg    8.88 % MgO
   Titanium    0.16 %  Ti    0.27 % TiO2
   Manganese   0.31 %  Mn    0.45 % Mn2O3
   Aluminum    0.80 %  Al    1.51 % Al2O3
   Iron       17.47 %  Fe   12.06 % FeO / 11.57 % Fe2O3
   Silicon    25.65 %  Si   54.87 % SiO2
   Hydrogen    0.23 %  H     2.06 % H2O
   Oxygen     43.83 %  O
             ______        ______ 
             100.00 %      100.10 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na1.56Ca0.43K0.03Mg1.93Fe2+1.47Fe3+1.27Al0.26Mn3+0.05Ti0.03(Si8O22)(OH)2
Help on Environment: Environment: Sodium-rich igneous and metamorphic rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1957
Help on Locality: Locality: Socotra island, Indian Ocean, Yemen. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the composition and relatinship to riebeckite.
 

Magnesioriebeckite Image

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  Magnesioriebeckite

Comments: Crystal of magnesioriebeckite showing massive and asbestosform habits.
Location: Cochabamba Dept, Bolivia. Scale: 2.5 cm.
© John Attard

Magnesioriebeckite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5448:1:0.291
Help on Cell Dimensions: Cell Dimensions: a = 9.801, b = 17.988, c = 5.235, Z = 2; beta = 104.984° V = 891.55 Den(Calc)= 3.26
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 8.45(1), 3.12(0.9), 2.89(0.6),
 

Physical Properties of Magnesioriebeckite

Help on Cleavage: Cleavage: {110} Perfect
Help on Color: Color: Light blue, Dark blue, Black, Black blue.
Help on Density: Density: 3.19
Help on Diaphaneity: Diaphaneity: Translucent to Subopaque
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Vitreous - Silky
Help on Streak: Streak: blue gray
 

Optical Properties of Magnesioriebeckite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.041 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.062 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2065,KPDmeas= 0.2111,KC= 0.2201
Ncalc = 1.7 - 1.72
Help on Optical Data: Optical Data: Biaxial (-), a=1.668, b=1.672, g=1.68, bire=0.0120, 2V(Calc)=72, 2V(Meas)=75-85.
 

Calculated Properties of Magnesioriebeckite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.15 gm/cc
note: Specific Gravity of Magnesioriebeckite =3.19 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEMagnesioriebeckite = 6.72 barns/electron
U=PEMagnesioriebeckite x relectron= 21.14 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 1.93 (Gamma Ray American Petroleum Institute Units)
Concentration of Magnesioriebeckite per GRapi unit = 51.93 (%)

Estimated Radioactivity from Magnesioriebeckite - barely detectable

 

Magnesioriebeckite Classification

Help on  Dana Class: Dana Class: 66.01.03c.04 (66)Inosilicate Double-Width Unbranched Chains, W=2
  (66.01)with P=2 amphibole configuration
  (66.01.03c)Group 4, the sodic amphiboles
 
66.01.03c.01 Glaucophane []Na2(Mg3Al2)Si8O22(OH)2 C 2/m 2/m
 
66.01.03c.02 Ferroglaucophane []Na2(Fe3Al2)Si8O22(OH)2 C 2/m 2/m
 
66.01.03c.03 Crossite? Na2(Mg,Fe)3(Al,Fe)2Si8O22(OH)2 C 2/m 2/m
 
66.01.03c.04 Magnesioriebeckite []Na2[(Mg,Fe)3Fe2]Si8O22(OH)2 C 2/m 2/m
 
66.01.03c.05 Riebeckite []Na2(Fe3Fe2)Si8O22(OH)2 C 2/m 2/m
 
66.01.03c.06 Eckermannite NaNa2(Mg4Al)Si8O22(OH)2 C 2/m 2/m
 
66.01.03c.07 Ferro-eckermannite NaNa2(Fe4Al)Si8O22(OH)2 C 2/m 2/m
 
66.01.03c.08 Magnesio-arfvedsonite NaNa2(Mg4Fe)Si8O22(OH)2 C 2/m 2/m
 
66.01.03c.09 Arfvedsonite NaNa2(Fe4Fe)Si8O22(OH)2 C 2/m 2/m
 
66.01.03c.09a Fluoro-magnesio-arfvedsonite! NaNa2(Mg,Fe)4Fe[Si8O22](F,OH)2 C 2/m 2/m
 
66.01.03c.09b Potassicarfvedsonite! KNa2Fe4FeSi8O22(OH)2 C 2/m 2/m
 
66.01.03c.10 Kozulite NaNa2Mn4(Fe,Al)Si8O22(OH)2 C 2/m 2/m
 
66.01.03c.11 Nyboite NaNa2(Mg3Al2)Si7AlO22(OH)2 C 2/m 2/m
 
66.01.03c.11a Ferronyboite! NaNa2(Fe)3Al2(Si7Al)O22(OH)2 C 2/m 2/m
 
66.01.03c.11b Ferric-ferronyboite! NaNa2(Fe)3(Fe)2(Si7Al)O22(OH)2 C 2/m 2/m
 
66.01.03c.11c Fluoronyboite! NaNa2(Al2Mg3)(Si7Al)O22(F,OH)2 C 2/m 2/m
 
66.01.03c.12 Leakeite NaNa2(Mg2Fe2Li)Si8O22(OH)2 C 2/m 2/m
 
66.01.03c.12a Ferroleakeite! NaNa2(Fe)3(Fe)2Li(Si8O22)(OH)2 C 2/m 2/m
 
66.01.03c.12b Potassicleakeite! KNa2Mg2Fe2LiSi8O22(OH)2 C 2/m 2/m
 
66.01.03c.13 Kornite Na(CaNa)Fe4(Al,Fe)Si7AlO22(OH)2 C 2/m 2/m
 
66.01.03c.14 Ungarettiite NaNa2(Mn2Mn3)Si8O22O2 C 2/m 2/m
 
66.01.03c.15 Fluoro-ferroleakeite NaNa2(Fe2Fe2Li)Si8O22F2 C 2/m 2/m
 
66.01.03c.16 Obertiite! NaNa2(Mg3FeTi)Si8O22(O,F,OH)2 C 2/m 2/m
 
66.01.03c.17 Dellaventuraite! NaNa2(Mg2,Mn,Li,Ti)Si8O22O2 C 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.DE.25 09 - SILICATES (Germanates)
  09.D - Inosilicates* Structural terminology according to Liebau (1985)
  09.DE -Inosilicates with 2-periodic double chains, Si4O11; amphibole family
 
09.DE.25 Arfvedsonite NaNa2(Fe4Fe)Si8O22(OH)2 C 2/m 2/m
 
09.DE.25 Ferroglaucophane []Na2(Fe3Al2)Si8O22(OH)2 C 2/m 2/m
 
09.DE.25 Crossite? Na2(Mg,Fe)3(Al,Fe)2Si8O22(OH)2 C 2/m 2/m
 
09.DE.25 Eckermannite NaNa2(Mg4Al)Si8O22(OH)2 C 2/m 2/m
 
09.DE.25 Glaucophane []Na2(Mg3Al2)Si8O22(OH)2 C 2/m 2/m
 
09.DE.25 Fluoro-ferroleakeite NaNa2(Fe2Fe2Li)Si8O22F2 C 2/m 2/m
 
09.DE.25 Ferro-eckermannite NaNa2(Fe4Al)Si8O22(OH)2 C 2/m 2/m
 
09.DE.25 Ferroleakeite! NaNa2(Fe)3(Fe)2Li(Si8O22)(OH)2 C 2/m 2/m
 
09.DE.25 Ferronyboite! NaNa2(Fe)3Al2(Si7Al)O22(OH)2 C 2/m 2/m
 
09.DE.25 Ferric-ferronyboite! NaNa2(Fe)3(Fe)2(Si7Al)O22(OH)2 C 2/m 2/m
 
09.DE.25 Obertiite! NaNa2(Mg3FeTi)Si8O22(O,F,OH)2 C 2/m 2/m
 
09.DE.25 Nyboite NaNa2(Mg3Al2)Si7AlO22(OH)2 C 2/m 2/m
 
09.DE.25 Magnesioriebeckite []Na2[(Mg,Fe)3Fe2]Si8O22(OH)2 C 2/m 2/m
 
09.DE.25 Kozulite NaNa2Mn4(Fe,Al)Si8O22(OH)2 C 2/m 2/m
 
09.DE.25 Kornite Na(CaNa)Fe4(Al,Fe)Si7AlO22(OH)2 C 2/m 2/m
 
09.DE.25 Leakeite NaNa2(Mg2Fe2Li)Si8O22(OH)2 C 2/m 2/m
 
09.DE.25 Magnesio-arfvedsonite NaNa2(Mg4Fe)Si8O22(OH)2 C 2/m 2/m
 
09.DE.25 Ungarettiite NaNa2(Mn2Mn3)Si8O22O2 C 2/m 2/m
 
09.DE.25 Riebeckite []Na2(Fe3Fe2)Si8O22(OH)2 C 2/m 2/m
 
09.DE.25 Potassicleakeite! KNa2Mg2Fe2LiSi8O22(OH)2 C 2/m 2/m
 
09.DE.25 Fluoronyboite! NaNa2(Al2Mg3)(Si7Al)O22(F,OH)2 C 2/m 2/m
 
09.DE.25 Fluoro-magnesio-arfvedsonite! NaNa2(Mg,Fe)4Fe[Si8O22](F,OH)2 C 2/m 2/m
 
09.DE.25 Potassicarfvedsonite! KNa2Fe4FeSi8O22(OH)2 C 2/m 2/m
 
09.DE.25 Dellaventuraite! NaNa2(Mg2,Mn,Li,Ti)Si8O22O2 C 2/m 2/m
 

Other Magnesioriebeckite Information

Help on References: References: PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Magnesioriebeckite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info

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Print or Cut-and-Paste your Magnesioriebeckite Specimen Label here :

Magnesioriebeckite

[ ]Na2[(Mg,Fe++)3Fe+++2]Si8O22(OH)2
Dana No: 66.01.03c.04 Strunz No: 09.DE.25
Locality:

 

Notes:

 

 
   
 


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