Ferri-clinoholmquistite Mineral Data

General Ferri-clinoholmquistite Information

Chemical Formula:

[ ]Li2Mg3(Fe3+)2(Si8O22)(OH)2

Composition:

Molecular Weight = 849.26 gm

Potassium 0.14 % K 0.17 % K₂O

Sodium 1.98 % Na 2.66 % Na₂O

Lithium 1.76 % Li 3.78 % Li₂O

Calcium 0.19 % Ca 0.26 % CaO

Magnesium 3.46 % Mg 5.74 % MgO

Titanium 0.68 % Ti 1.13 % TiO₂

Aluminum 0.64 % Al 1.20 % Al₂O₃

Zinc 0.15 % Zn 0.19 % ZnO

Iron 19.00 % Fe 11.42 % FeO / 14.48 % Fe₂O₃

Silicon 26.46 % Si 56.60 % SiO₂

Hydrogen 0.19 % H 1.68 % H₂O

Oxygen 44.42 % O

Fluorine 0.94 % F 0.94 % F

- % F -0.40 % -O=F₂

______ ______

100.00 % 99.86 % = TOTAL OXIDE

Empirical Formula:

Na_0.43K_0.03Li_1.66Na_0.3Ca_0.04Fe³⁺_1.54Fe²⁺_1.35Mg_1.21Li_0.49Al_0.2Ti_0.12Zn_0.02Si₈O₂₂ (OH)_1.58F_0.42

Environment:

Hydrothermal episyenitic bodies located in the east of the Pedriza Massif.

IMA Status:

Approved IMA 1998 (Dana # Added)

Locality:

East Pedriza Massif (Central System, Spain), Link to MinDat.org Location Data.

Name Origin:

The name reflects its composition, monoclinic crystal structure, and relationship to holmquistite in accord with the nomenclature of Leake (1978a, 1978b)

Synonym:

IMA1995-045

IMA1995-045b

Sodic-ferriclinoferroholmquistite

Ferri-clinoholmquistite Crystallography

Axial Ratios:

a:b:c =0.5308:1:0.2956

Cell Dimensions:

a = 9.472, b = 17.844, c = 5.276, Z = 2; beta = 101.97° V = 872.35 Den(Calc)= 3.23

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/I_o): 3.1(1)(310), 8.222(0.61)(110), 2.741(0.53)(330),1.433(0.46)(243), 4.458(0.19)(040),

Physical Properties of Ferri-clinoholmquistite

Cleavage:

{110} Perfect, {110} Perfect

Color:

Black.

Density:

3.19

Diaphaneity:

Translucent

Fracture:

Brittle - Splintery - Brittle fracture leaving splintery fragments.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

6 - Orthoclase

Luster:

Vitreous (Glassy)

Streak:

gray

Optical Properties of Ferri-clinoholmquistite

Gladstone-Dale:

CI meas= 0.03 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.042 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2178,KPDmeas= 0.2205,KC= 0.2272
Ncalc = 1.72 - 1.73

Optical Data:

Biaxial (+), a=1.699, b=1.703, g=1.708, bire=0.0090, 2V(Calc)=84, 2V(Meas)=72. Dispersion r < v.

Calculated Properties of Ferri-clinoholmquistite

Electron Density:

Bulk Density (Electron Density)=3.14 gm/cc
note: Specific Gravity of Ferri-clinoholmquistite =3.19 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_{Ferri-clinoholmquistite}= 7.02 barns/electron
U=PE_{Ferri-clinoholmquistite} x r_electron= 22.01 barns/cc.

Radioactivity:

GRapi = 1.97 (Gamma Ray American Petroleum Institute Units)
Concentration of Ferri-clinoholmquistite per GRapi unit = 50.87 (%)

Estimated Radioactivity from Ferri-clinoholmquistite - barely detectable

Ferri-clinoholmquistite Classification

Dana Class:

66.01.01.08a (66)Inosilicate Double-Width Unbranched Chains, W=2

(66.01)with P=2 amphibole configuration

(66.01.01)Group 1, the Mg-Fe-Mn-Li amphiboles (Monoclinic)

66.01.01.01 Magnesiocummingtonite (Mg,Fe)7Si8O22(OH)2 C 2/m 2/m

66.01.01.02 Cummingtonite []Mg7Si8O22(OH)2 C 2/m 2/m

66.01.01.03 Grunerite []Fe7Si8O22(OH)2 C 2/m 2/m

66.01.01.03b Permanganogrunerite! []Mn4(Fe)3(Si8O22)(OH)2 C 2/m 2/m

66.01.01.04 Manganocummingtonite Na(Na,Mn)2(Mg4,Fe)5Si8O22(OH)2 C 2/m 2/m

66.01.01.05 Manganogrunerite []Mn2Fe5Si8O22(OH) C 2/m 2/m

66.01.01.06 Magnesioclinoholmquistite? Li2(Mg,Fe)3Al2Si8O22(OH)2 C 2/m 2/m

66.01.01.07 Clinoholmquistite? [](Li2Mg3Al2)Si8O22(OH)2 C 2/m 2/m

66.01.01.08 Clinoferroholmquistite [](Li2Fe3Al2)Si8O22(OH)2 C 2/m 2/m

66.01.01.08a Ferri-clinoholmquistite! []Li2Mg3(Fe3)2(Si8O22)(OH)2 C 2/m 2/m

66.01.01.08b Ferri-clinoferroholmquistite! []Li2(Fe2Fe3)Si8O22(OH)2 C 2/m 2/m

66.01.01.09 Sodic-ferripedrizite! Na(LiNa)(Fe2Mg2Li)Si8O22(OH,F)2 C 2/m 2/m

66.01.01.09a Ferripedrizite! NaLi2(Fe2Mg2Li)Si8O22(OH)2 C 2/m 2/m

66.01.01.09b Sodic-ferri-ferropedrizite! NaLi2(Fe2Fe3)Si8O22(OH)2 C 2/m 2/m

66.01.01.09c Fluoro-sodic-pedrizite! NaLi2(Mg2Al2Li)S5Si8O22F2 C 2/m 2/m

Strunz Class:

09.DD.05 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DD -Inosilicates with 2-periodic double chains, Si4O11; amphibole family

09.DD.05 Ferri-clinoholmquistite! []Li2Mg3(Fe3)2(Si8O22)(OH)2 C 2/m 2/m

09.DD.05 Clinoholmquistite? [](Li2Mg3Al2)Si8O22(OH)2 C 2/m 2/m

09.DD.05 Magnesiogedrite? (Mg,Fe)5Al2Si6Al2O22(OH)2 P nma 2/m 2/m 2/m

09.DD.05 Magnesioholmquistite Li2(Mg,Fe)3Al2Si8O22(OH)2 P nma 2/m 2/m 2/m

09.DD.05 Magnesioclinoholmquistite? Li2(Mg,Fe)3Al2Si8O22(OH)2 C 2/m 2/m

Other Ferri-clinoholmquistite Information

References:

NAME( AmMin 83:167) PHYS. PROP.(AmMin 83:167) OPTIC PROP.(Am.Min., 83:167)

See Also:

Links to other databases for Ferri-clinoholmquistite :
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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Ferri-clinoholmquistite

[ ]Li2Mg3(Fe3+)2(Si8O22)(OH)2
Dana No: 66.01.01.08a Strunz No: 09.DD.05
Locality:

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