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Ferriwhittakerite Mineral Data

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General Ferriwhittakerite Information

Help on Chemical  Formula: Chemical Formula: Na(NaLi)(Mg2Fe+++2Li)Si8O22(OH)2
Help on Composition: Composition: Molecular Weight = 867.82 gm
   Potassium   0.63 %  K     0.76 % K2O
   Sodium      5.09 %  Na    6.86 % Na2O
   Lithium     1.08 %  Li    2.32 % Li2O
   Calcium     0.51 %  Ca    0.71 % CaO
   Magnesium   4.12 %  Mg    6.83 % MgO
   Titanium    0.66 %  Ti    1.10 % TiO2
   Manganese   0.76 %  Mn    0.98 % MnO
   Aluminum    0.31 %  Al    0.59 % Al2O3
   Zinc        3.01 %  Zn    3.75 % ZnO
   Iron       13.26 %  Fe    4.80 % FeO / 13.62 % Fe2O3
   Silicon    25.89 %  Si   55.39 % SiO2
   Hydrogen    0.15 %  H     1.35 % H2O
   Oxygen     42.96 %  O
   Fluorine    1.58 %  F     1.58 % F
                -   %   F    -0.66 % -O=F2    
             ______        ______ 
             100.00 %       99.97 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na0.64K0.14Li0.62Na1.28Ca0.11Fe2+0.58Mg1.47Mn2+0.12Zn0.4Fe3+1.48Al0.1Ti0.12Li0.73 Si8O22(OH)1.3F0.72
Help on Environment: Environment: In episyenitic bodies. Amphibole group; structure determined
Help on IMA Status: IMA Status: Proposed IMA 2002 (Dana # Added)
Help on Locality: Locality: East sector of the Pedriza Massif, Sierra de Guadarrama, Spanish Central System, Spain. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Eric J.W. Whittaker (1921-), of Oxford University, who did pioneering work in amphibole crystal-chemistry.
Help on Synonym: Synonym: IMA2001-069
 

Ferriwhittakerite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.544:1:0.2967
Help on Cell Dimensions: Cell Dimensions: a = 9.712, b = 17.851, c = 5.297, Z = 2; beta = 103.63° V = 892.47 Den(Calc)= 3.23
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): 2.701(1)(151), 8.344(0.98)(110), 3.392(0.74)(131),3.098(0.72)(310), 2.524(0.67)(202), 4.463(0.44)(040), 2.576(0.36)(061), 2.157(0.35)(261),
 

Physical Properties of Ferriwhittakerite

Help on Cleavage: Cleavage: {110} Perfect, {110} Perfect
Help on Color: Color: Bluish black.
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: gray
 

Optical Properties of Ferriwhittakerite

Help on Optical Data: Optical Data: NCalc= 1.72 - from Gladstone-Dale relationship (KC = 0.2227) where Ncalc=Dcalc*KC+1
 

Calculated Properties of Ferriwhittakerite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.17 gm/cc
note: Specific Gravity of Ferriwhittakerite =3.23 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEFerriwhittakerite = 7.02 barns/electron
U=PEFerriwhittakerite x relectron= 22.28 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 8.94 (Gamma Ray American Petroleum Institute Units)
Concentration of Ferriwhittakerite per GRapi unit = 11.19 (%)

Estimated Radioactivity from Ferriwhittakerite - barely detectable

 

Ferriwhittakerite Classification

Help on  Dana Class: Dana Class: 66.01.03d.02 (66)Inosilicate Double-Width Unbranched Chains, W=2
  (66.01)with P=2 amphibole configuration
  (66.01.03d)Group 5, the Na-Ca-Mg-Fe-Mn-Li amphiboles, where Li(b) = 0.50 apfu
 
66.01.03d.01 Ferri-ottoliniite! [](Na,Li)(Mg3Fe2)Si8O22(OH)2 C 2/m 2/m
 
66.01.03d.02 Ferriwhittakerite! Na(NaLi)(Mg2Fe2Li)Si8O22(OH)2 C 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.DE.15 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.15 Potassicferrisadanagaite! (K,Na)Ca2(Fe,Mg)2(Fe,Al)2[Si5Al3O22](OH,F,O)2 C 2/m 2/m
 
09.DE.15 Ferrochloropargasite! NaCa2(Fe4Al)Si6Al2O22Cl2 C 2/m 2/m
 
09.DE.15 Potassic-chlorohastingsite! (K,Na)Ca2(Fe,Mg)4Fe[Si6Al2O22](Cl,OH)2 C 2/m 2/m
 
09.DE.15 Ferriwhittakerite! Na(NaLi)(Mg2Fe2Li)Si8O22(OH)2 C 2/m 2/m
 
09.DE.15 Ferri-ottoliniite! [](Na,Li)(Mg3Fe2)Si8O22(OH)2 C 2/m 2/m
 
09.DE.15 Potassic-chloropargasite! (K,Na)Ca2(Mg,Fe2)4Al(Si6Al2O22)(Cl,OH)2 C 2/m 2/m
 

Other Ferriwhittakerite Information

Help on References: References: NAME( CanMin, 42:1245) PHYS. PROP.(CanMin, 42:1245) OPTIC PROP.(CanMin, 42:1245)
Help on See Also: See Also: Links to other databases for Ferriwhittakerite :
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 Ferriwhittakerite Specimen Label here :

Ferriwhittakerite

Na(NaLi)(Mg2Fe+++2Li)Si8O22(OH)2
Dana No: 66.01.03d.02 Strunz No: 09.DE.15
Locality:

 

Notes:

 

 
   
 


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