Ferri-ottoliniite Mineral Data

Ferri-ottoliniite Mineral Data

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General Ferri-ottoliniite Information

Chemical Formula:

[ ](Na,Li)(Mg3Fe+++2)Si8O22(OH)2

Composition:

Molecular Weight = 865.55 gm

Potassium 0.32 % K 0.38 % K₂O

Sodium 2.87 % Na 3.87 % Na₂O

Lithium 1.32 % Li 2.85 % Li₂O

Calcium 0.28 % Ca 0.39 % CaO

Magnesium 3.79 % Mg 6.29 % MgO

Titanium 0.33 % Ti 0.55 % TiO₂

Manganese 0.83 % Mn 1.07 % MnO

Aluminum 0.31 % Al 0.59 % Al₂O₃

Zinc 2.34 % Zn 2.91 % ZnO

Iron 16.97 % Fe 7.64 % FeO / 15.77 % Fe₂O₃

Silicon 25.96 % Si 55.53 % SiO₂

Hydrogen 0.18 % H 1.58 % H₂O

Oxygen 43.48 % O

Fluorine 1.03 % F 1.03 % F

- % F -0.43 % -O=F₂

______ ______

100.00 % 100.02 % = TOTAL OXIDE

Empirical Formula:

Na_0.38K_0.07Li_1.24Na_0.7Ca_0.06Fe²⁺_0.92Mg_1.35Mn²⁺_0.13Zn_0.31Fe³⁺_1.71Al_0.1Ti_0.06Li_0.41 Si₈O₂₂(OH)_1.52F_0.47

Environment:

Found as relict cores in other amphiboles in hydrothermal episyenitic bodies in the Pedridza massif. (amphibole group; structure)

IMA Status:

Approved IMA 2004 (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 Luisa Ottolini (b. 1954), of CNR - Istituto di Geoscienze e Georisorse, Pavia, Italy, for her fundamental contributions to the advancement of ion-probe analysis of rock-fo rming minerals.

Synonym:

IMA2001-067

IMA2001-067a

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Ferri-ottoliniite Crystallography

Axial Ratios:

a:b:c =0.5333:1:0.2961

Cell Dimensions:

a = 9.535, b = 17.876, c = 5.294, Z = 2; beta = 102.54° V = 880.82 Den(Calc)= 3.26

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 8.256(1)(110), 2.709(0.81)(151), 2.501(0.68)(202),3.057(0.56)(310), 3.407(0.45)(131), 4.469(0.33)(040), 2.581(0.26)(061), 2.16(0.25)(261),

Crystal Structure:

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Oberti R , Camara F , Caballero J M , American Mineralogist , 89 (2004) p.888-893, Ferri-ottoliniite and ferriwhittakerite, two new end-members of the new, Group 5 for monoclinic amphiboles

Physical Properties of Ferri-ottoliniite

Cleavage:

[110] Perfect, [110] Perfect

Color:

Black.

Diaphaniety:

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:

5-6 - Between Apatite and Orthoclase

Luster:

Vitreous (Glassy)

Streak:

gray

Optical Properties of Ferri-ottoliniite

Optical Data:

Biaxial (?)

Calculated Properties of Ferri-ottoliniite

Electron Density:

r_electron=3.20 gm/cc
note: r_{Ferri-ottoliniite}=3.26 gm/cc.

Fermion Index

Fermion Index = 0.0221
Boson Index = 0.9779

Photoelectric:

PE_{Ferri-ottoliniite}= 7.66 barns/electron
U=PE_{Ferri-ottoliniite} x r_electron= 24.52 barns/cc.

Radioactivity:

GRapi = 4.49 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Ferri-ottoliniite - barely detectable

Ferri-ottoliniite Classification

Dana Class:

66.1.3d.1 (66)Inosilicate Double-Width Unbranched Chains, W=2

(66.1)Dana Type

(66.1.3d)Group 5, the Na-Ca-Mg-Fe-Mn-Li amphiboles, where Li(b) = 0.50 apfu

66.1.3d.1 Ferri-ottoliniite ! [](Na,Li)(Mg3Fe2)Si8O22(OH)2 C 2/m 2/m

66.1.3d.2 Ferriwhittakerite! Na(NaLi)(Mg2Fe2Li)Si8O22(OH)2 C 2/m 2/m

Strunz Class:

VIII/FX.00-00 VIII - Silicates

VIII/FX - Unclassified Strunz Inosilicates

VIII/FX.00 - Group 5, the Na-Ca-Mg-Fe-Mn-Li

Other Ferri-ottoliniite Information

References:

NAME( CanMin, 42:1244) PHYS. PROP.(CanMin, 42:1244) OPTIC PROP.(CanMin, 42:1244)

See Also:

Links to other databases for Ferri-ottoliniite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Ferri-ottoliniite

[ ](Na,Li)(Mg3Fe+++2)Si8O22(OH)2
Dana No: 66.1.3d.1 Strunz No: VIII/FX.00-00
Locality:

Notes: