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Ferriwhittakerite Mineral Data
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General Ferriwhittakerite Information
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 Chemical Formula: |
Na(NaLi)(Mg2Fe+++2Li)Si8O22(OH)2 |
| Composition: |
Molecular Weight = 867.82 gm |
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Potassium 0.63 % K 0.76 % K2O |
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Sodium 5.09 % Na 6.86 % Na2O |
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Lithium 1.08 % Li 2.32 % Li2O |
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Calcium 0.51 % Ca 0.71 % CaO |
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Magnesium 4.12 % Mg 6.83 % MgO |
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Titanium 0.66 % Ti 1.10 % TiO2 |
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Manganese 0.76 % Mn 0.98 % MnO |
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Aluminum 0.31 % Al 0.59 % Al2O3 |
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Zinc 3.01 % Zn 3.75 % ZnO |
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Iron 13.26 % Fe 4.80 % FeO / 13.62 % Fe2O3 |
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Silicon 25.89 % Si 55.39 % SiO2 |
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Hydrogen 0.15 % H 1.35 % H2O |
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Oxygen 42.96 % O |
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Fluorine 1.58 % F 1.58 % F |
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- %
F -0.66 % -O=F2 |
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______ ______ |
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100.00 % 99.97 % = TOTAL OXIDE |
| Empirical Formula: |
Na0.64K0.14Li0.62Na1.28Ca0.11Fe2+0.58Mg1.47Mn2+0.12Zn0.4Fe3+1.48Al0.1Ti0.12Li0.73
Si8O22(OH)1.3F0.72 |
| Environment: |
In episyenitic bodies. Amphibole group; structure determined |
| IMA Status: |
Proposed IMA 2002 (Dana # Added) |
| Locality: |
East sector of the Pedriza Massif, Sierra de Guadarrama, Spanish Central System, Spain. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Eric J.W. Whittaker (1921-), of Oxford University, who did pioneering work in amphibole crystal-chemistry. |
| Synonym: |
IMA2001-069 |
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Ferriwhittakerite Crystallography
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| Axial Ratios: |
a:b:c =0.544:1:0.2967 |
| Cell Dimensions: |
a = 9.712, b = 17.851, c = 5.297, Z = 2; beta = 103.63° V = 892.47 Den(Calc)= 3.23 |
| Crystal System: |
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m |
| 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), |
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Physical Properties of Ferriwhittakerite
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| Cleavage: |
{110} Perfect, {110} Perfect |
| Color: |
Bluish black. |
| Diaphaneity: |
Translucent |
| Fracture: |
Brittle - Uneven - Very brittle fracture producing uneven fragments. |
| Habit: |
Aggregates - Made of numerous individual crystals or clusters. |
| Habit: |
Granular - Generally occurs as anhedral to subhedral crystals in matrix. |
| Hardness: |
6 - Orthoclase |
| Luster: |
Vitreous (Glassy) |
| Streak: |
gray |
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Optical Properties of Ferriwhittakerite
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| Optical Data: |
NCalc= 1.72 - from Gladstone-Dale relationship (KC = 0.2227) where Ncalc=Dcalc*KC+1
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Calculated Properties of Ferriwhittakerite
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| Electron Density: |
Bulk Density (Electron Density)=3.17 gm/cc
note: Specific Gravity of Ferriwhittakerite =3.23 gm/cc.
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| Fermion Index: |
Fermion Index = 0.02
Boson Index = 0.98 |
| Photoelectric: |
PEFerriwhittakerite = 7.02 barns/electron
U=PEFerriwhittakerite x relectron= 22.28 barns/cc.
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| Radioactivity: |
GRapi = 8.94 (Gamma Ray American Petroleum Institute Units)
Concentration of Ferriwhittakerite per GRapi unit = 11.19 (%)
Estimated Radioactivity from Ferriwhittakerite  - barely detectable
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Ferriwhittakerite Classification
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| Dana Class: |
66.01.03d.02 (66)Inosilicate Double-Width Unbranched Chains, W=2 |
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(66.01)with P=2 amphibole configuration |
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(66.01.03d)Group 5, the Na-Ca-Mg-Fe-Mn-Li amphiboles, where Li(b) = 0.50 apfu |
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66.01.03d.01 Ferri-ottoliniite! [](Na,Li)(Mg3Fe2)Si8O22(OH)2 C 2/m 2/m |
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66.01.03d.02 Ferriwhittakerite! Na(NaLi)(Mg2Fe2Li)Si8O22(OH)2 C 2/m 2/m |
| Strunz Class: |
09.DE.15 09 - SILICATES (Germanates) |
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09.D - Inosilicates* Structural terminology according to Liebau (1985) |
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09.DE -Inosilicates with 2-periodic double chains, Si4O11; amphibole family |
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09.DE.15 Potassicferrisadanagaite! (K,Na)Ca2(Fe,Mg)2(Fe,Al)2[Si5Al3O22](OH,F,O)2 C 2/m 2/m |
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09.DE.15 Ferrochloropargasite! NaCa2(Fe4Al)Si6Al2O22Cl2 C 2/m 2/m |
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09.DE.15 Potassic-chlorohastingsite! (K,Na)Ca2(Fe,Mg)4Fe[Si6Al2O22](Cl,OH)2 C 2/m 2/m |
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09.DE.15 Ferriwhittakerite! Na(NaLi)(Mg2Fe2Li)Si8O22(OH)2 C 2/m 2/m |
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09.DE.15 Ferri-ottoliniite! [](Na,Li)(Mg3Fe2)Si8O22(OH)2 C 2/m 2/m |
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09.DE.15 Potassic-chloropargasite! (K,Na)Ca2(Mg,Fe2)4Al(Si6Al2O22)(Cl,OH)2 C 2/m 2/m |
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Other Ferriwhittakerite Information
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| References: |
NAME( CanMin, 42:1245) PHYS. PROP.(CanMin, 42:1245) OPTIC PROP.(CanMin, 42:1245) |
| 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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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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