Mangani-obertiite

Mangani-obertiite

Caspar quarry, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany

Mangani-obertiite, etc.

Caspar quarry, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany

Mangani-obertiite, etc.

Caspar quarry, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany

Mangani-obertiite

Caspar quarry, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany

Mangani-obertiite, etc.

Caspar quarry, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany

Mangani-obertiite, etc.

Caspar quarry, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany

Mangani-obertiite

Caspar quarry, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany

Mangani-obertiite, etc.

Caspar quarry, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany

About Mangani-obertiiteHide

Roberta Oberti

Formula:

NaNa₂(Mg₃Mn³⁺Ti⁴⁺)Si₈O₂₂O₂

Mangani-obertiite is a obertiite root name amphibole in the ^WO^2- dominant amphibole group with Mg as the dominant element in the C²⁺ position and Mn³⁺ as the dominant element in the C³⁺ position.

Colour:

Pale pink

Lustre:

Vitreous

Hardness:

5

Specific Gravity:

3.16 (Calculated)

Crystal System:

Monoclinic

Member of:

Obertiite Root Name Group > w(O)-dominant Amphibole Group > Amphibole Supergroup

Name:

The obertiite root name is for Prof. Roberta Oberti, University of Pavia, Italy, for her contributions to the crystal chemistry of amphiboles.

This mineral was originally named obertiite (IMA 1998-046). It was re-named ferri-obertiite in 2012 to align the use of pre-fixes in the obertiite root name minerals with the general amphibole nomenclature rules. Re-investigation of the holotype material in 2014 revealed that Mn³⁺ > Fe³⁺, hence the mineral was renamed to mangani-obertiite.

Type Locality:

ⓘ Caspar quarry, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany

Data provided by Günter Blaß show a wide range of Fe/Mn ratios in the obertiite root name minerals from the Eifel area. It is therefore likely that both ferri-obertiite and mangani-obertiite is present.

Unique IdentifiersHide

IMA Classification of Mangani-obertiiteHide

Classification of Mangani-obertiiteHide

Mineral SymbolsHide

Physical Properties of Mangani-obertiiteHide

Optical Data of Mangani-obertiiteHide

Type:

Biaxial (-)

RI values:

n_α = 1.643 n_β = 1.657 n_γ = 1.670

2V:

Measured: 81° (1), Calculated: 93°

Max Birefringence:

δ = 0.027

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Surface Relief:

Moderate

Dispersion:

None visible

Optical Extinction:

X ∧ a = 2° (in β obtuse), Y ∧ c = 12° (in β obtuse), Z = b.

Pleochroism:

Weak

Comments:

Pink to red-orange.

Comments:

Absorption: X ~ Y ~ Z.

Type material: Large crystals (up to 10×40× 200 μm) always taper along their length and show anomalous optical properties; smaller crystals (< 100 μm long) are not tapered and show normal optical properties in transmitted light.

Chemistry of Mangani-obertiiteHide

Crystallography of Mangani-obertiiteHide

Crystal StructureHide

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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure

ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0002347	Mangani-obertiite	Hawthorne F C, Cooper M A, Grice J D, Ottolini L (2000) A new anhydrous amphibole from the Eifel region, Germany: Description and crystal structure of obertiite, NaNa2(Mg3FeTi)Si8O22O2 American Mineralogist 85 236-241		2000	Eifel region, Germany	0	293

CIF Raw Data - click here to closedata_global _chemical_name_mineral 'Mangani-obertiite' loop_ _publ_author_name 'Hawthorne F C' 'Cooper M A' 'Grice J D' 'Ottolini L' _journal_name_full 'American Mineralogist' _journal_volume 85 _journal_year 2000 _journal_page_first 236 _journal_page_last 241 _publ_section_title ; A new anhydrous amphibole from the Eifel region, Germany: Description and crystal structure of obertiite, NaNa2(Mg3FeTi)Si8O22O2 Note: M1A and M1 are interchanged in the bond length table Note: IMA name change from obertiite to ferri-obertiite to mangani-obertiite ; _database_code_amcsd 0002347 _chemical_compound_source 'Eifel region, Germany' _chemical_formula_sum 'O24 Si8 Ti.86 Mn.37 Mg2.13 Fe.71 Al.03 Na2.66 Ca2 K.18' _cell_length_a 9.776 _cell_length_b 17.919 _cell_length_c 5.292 _cell_angle_alpha 90 _cell_angle_beta 104.05 _cell_angle_gamma 90 _cell_volume 899.299 _exptl_crystal_density_diffrn 3.363 _symmetry_space_group_name_H-M 'C 1 2/m 1' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2+y,z' 'x,-y,z' '1/2+x,1/2-y,z' '-x,y,-z' '1/2-x,1/2+y,-z' '-x,-y,-z' '1/2-x,1/2-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_occupancy _atom_site_U_iso_or_equiv O1 0.11360 0.08580 0.21760 1.00000 ? O2 0.11700 0.16520 0.72490 1.00000 ? O3 0.10340 0.00000 0.70610 1.00000 ? O4 0.35780 0.25080 0.79950 1.00000 ? O5 0.34970 0.12760 0.08050 1.00000 ? O6 0.34610 0.12000 0.57980 1.00000 ? O7 0.34340 0.00000 0.29960 1.00000 ? SiT1 0.28360 0.08524 0.29410 1.00000 ? SiT2 0.28830 0.17078 0.79850 1.00000 ? Ti1A 0.00000 0.07880 0.50000 0.43000 ? Mn1A 0.00000 0.07880 0.50000 0.18500 ? Mg1 0.00000 0.09100 0.50000 0.38500 ? Mg2 0.00000 0.18172 0.00000 0.66000 ? Fe2 0.00000 0.18172 0.00000 0.32500 ? Al2 0.00000 0.18172 0.00000 0.01500 ? Mg3 0.00000 0.00000 0.00000 0.04000 ? Na4 0.00000 0.27380 0.50000 0.92000 ? Fe4 0.00000 0.27380 0.50000 0.03000 ? Ca4 0.00000 0.27380 0.50000 1.00000 ? KAm 0.04800 0.50000 0.10100 0.09000 0.02000 NaAm 0.04800 0.50000 0.10100 0.19000 0.02000 NaA2 0.00000 0.48860 0.00000 0.22000 0.02000 loop_ _atom_site_aniso_label _atom_site_aniso_U_11 _atom_site_aniso_U_22 _atom_site_aniso_U_33 _atom_site_aniso_U_12 _atom_site_aniso_U_13 _atom_site_aniso_U_23 O1 0.00620 0.00470 0.00910 0.00000 0.00070 0.00050 O2 0.00520 0.01280 0.00400 0.00000 0.00010 -0.00070 O3 0.00540 0.01270 0.00430 0.00000 0.00210 0.00000 O4 0.01150 0.00680 0.01110 0.00120 0.00050 -0.00360 O5 0.00690 0.01300 0.00750 0.00490 0.00300 -0.00080 O6 0.00840 0.01050 0.00660 -0.00460 0.00030 -0.00010 O7 0.00990 0.00870 0.01380 0.00000 0.00510 0.00000 SiT1 0.00580 0.00550 0.00500 -0.00040 0.00130 0.00080 SiT2 0.00510 0.00630 0.00400 0.00030 0.00010 -0.00080 Ti1A 0.00940 0.00940 0.00470 0.00000 0.00020 0.00000 Mn1A 0.00940 0.00940 0.00470 0.00000 0.00020 0.00000 Mg1 0.00940 0.00940 0.00470 0.00000 0.00020 0.00000 Mg2 0.00770 0.00840 0.00690 0.00000 0.00240 0.00000 Fe2 0.00770 0.00840 0.00690 0.00000 0.00240 0.00000 Al2 0.00770 0.00840 0.00690 0.00000 0.00240 0.00000 Mg3 0.00680 0.00820 0.00810 0.00000 0.00070 0.00000 Na4 0.02400 0.01590 0.02530 0.00000 0.01600 0.00000 Fe4 0.02400 0.01590 0.02530 0.00000 0.01600 0.00000 Ca4 0.02400 0.01590 0.02530 0.00000 0.01600 0.00000

X-Ray Powder DiffractionHide

Geological EnvironmentHide

Type Occurrence of Mangani-obertiiteHide

Synonyms of Mangani-obertiiteHide

Relationship of Mangani-obertiite to other SpeciesHide

Common AssociatesHide

Related Minerals - Strunz-mindat GroupingHide

Fluorescence of Mangani-obertiiteHide

Other InformationHide

Internet Links for Mangani-obertiiteHide

References for Mangani-obertiiteHide

Localities for Mangani-obertiiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.

Germany
Rhineland-Palatinate Ahrweiler Brohltal Burgbrohl ⓘ Herchenberg ?	Blass
Mayen-Koblenz Maifeld Ochtendung ⓘ Wannenköpfe Quarry ?	Blass +1 other reference
Pellenz Nickenich ⓘ Nickenicher Sattel ?	Blass
ⓘ Nickenicher Weinberg ?	Hand Egon Künzel et al. (2011)
Vordereifel Ettringen ⓘ Caspar quarry (TL)	Hawthorne et al. (2000)
Vulkaneifel Daun Üdersdorf ⓘ Emmelberg ?	Blass +2 other references