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Ferri-obertiite

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About Ferri-obertiiteHide

Roberta Oberti
Formula:
Na(Na2)(Mg3Fe3+Ti)(Si8O22)O2
Ferri-obertiite is a obertiite root name amphibole in the WO2- dominant amphibole group with Mg as the dominant element in the C2+ position and Fe3+ as the dominant element in the C3+ position.
Colour:
Pink-orange
Crystal System:
Monoclinic
Name:
The obertiite root name is for Prof. Roberta Oberti, University of Pavia, Italy, for her contributions to the crystal chemistry of amphiboles.


The obertiite root name mineral published as obertiite (IMA 1998-046) was renamed ferri-obertiite in 2012. Re-investigation of the holotype material in 2014 revealed that Mn3+ > Fe3+, hence this mineral was renamed to mangani-obertiite.

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.

Ferri-obertiite was formally approved as a new mineral by IMA in 2015 (IMA 2015-079).

Possible K-analogue is known: Unnamed (possible K analogue of ferri-obertiite).


Classification of Ferri-obertiiteHide

Approved
Approval Year:
2015
First Published:
2017

Physical Properties of Ferri-obertiiteHide

Colour:
Pink-orange

Optical Data of Ferri-obertiiteHide

Type:
Biaxial (+)
RI values:
nα = 1.664 nβ = 1.680 nγ = 1.722
2V:
Measured: 66.4° (3), Calculated: 64.7°
Max Birefringence:
δ = 0.058
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High

Chemical Properties of Ferri-obertiiteHide

Formula:
Na(Na2)(Mg3Fe3+Ti)(Si8O22)O2

Ferri-obertiite is a obertiite root name amphibole in the WO2- dominant amphibole group with Mg as the dominant element in the C2+ position and Fe3+ as the dominant element in the C3+ position.
IMA Formula:
NaNa2(Mg3Fe3+Ti)Si8O22O2

Crystallography of Ferri-obertiiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 9.7901(7) Å, b = 17.935(1) Å, c = 5.2892(4) Å
β = 104.142(2)°
Ratio:
a:b:c = 0.546 : 1 : 0.295
Unit Cell V:
900.58 ų
Z:
2

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
8.391(72)
3.388(72)
3.260(37)
3.116(76)
2.704(100)
2.583(39)
2.529(67)
2.160(39)

Type Occurrence of Ferri-obertiiteHide

Place of Conservation of Type Material:
Type material is deposited in the collections of the Museo di Mineralogia, Dipartimento di Scienze della Terra e dell’Ambiente, Università di Pavia, catalogue number 2015–02.
Empirical Formula of Type Material:
A(Na0.76K0.220.98B(Na1.61Ca0.35Mn2+0.042.00C(Mg3.58Mn2+0.11Fe3+0.62Ti4+0.66Cr3+0.01Zn0.01Ni0.015.00T(Si7.82Ti4+0.12Al0.068.00O22W[O1.26F0.55(OH)0.192.00
Geological Setting of Type Material:
Vesicles in a silicate vein in a basalt quarry
Associated Minerals at Type Locality:
Reference:
Oberti, R., Boiocchi, M., Hawthorne, F.C., Ball, N.A., Blass, G. (2017): Ferri-obertiite from the Rothenberg quarry, Eifel volcanic complex (Germany): mineral data and crystal-chemistry of a new amphibole end-member. Mineralogical Magazine: 81: 641–651.

Synonyms of Ferri-obertiiteHide

Relationship of Ferri-obertiite to other SpeciesHide

Other Members of this group:
Ferro-ferri-obertiiteNaNa2(Fe2+3Fe3+Ti)Si8O22O2Mon. 2/m : B2/m
Mangani-obertiiteNa(Na2)(Mg3Mn3+Ti)(Si8O22)O2Mon. 2/m : B2/m
Unnamed (possible K-analogue of Ferri-obertiite)KNa2[(Mg,Fe,Na)3Fe3+(Ti,Fe)]Si8O22(O,F)2

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Ferri-obertiiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Oberti, R., Ungaretti, L., Cannillo, E., Hawthrone, F. (1992) The behavior of Ti in Amphiboles: I. Four- and six-coordinated Ti in Richterite, European Journal of Mineralogy: 4: 425-439.
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(Mg3,Fe,Ti)Si8O28O2. American Mineralogist: 85: 236-241.
Oberti, R., Cannillo, E., Toscani, G. (2012) How to name amphiboles after the IMA2012 report: rules of thumb and a new PC program for monoclinic amphiboles. Periodico di Mineralogia: 81: 257-267.
Hawthorne, F.C., Oberti, R., Harlow, G.E., Maresch, W.V., Martin, R.F., Schumacher, J.C., Welch, M.D. (2012) Nomenclature of the amphibole supergroup. American Mineralogist: 97: 2031–2048.
Oberti, R., Boiocchi, M., Hawthorne, F.C.,Ball, N.A. and Blass, G. (2015) Ferri-obertiite, IMA 2015-079. CNMNC Newsletter No. 28, December 2015, page 1863; Mineralogical Magazine: 79: 1859–1864
Oberti, R., Boiocchi, M., Hawthorne, F.C., Ball, N.A., Blass, G. (2017): Ferri-obertiite from the Rothenberg quarry, Eifel volcanic complex (Germany): mineral data and crystal-chemistry of a new amphibole end-member. Mineralogical Magazine: 81: 641–651.

Internet Links for Ferri-obertiiteHide

Localities for Ferri-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 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Germany
 
  • Rhineland-Palatinate
    • Andernach
      • Nickenich
Blass, G.; Graf, H.W., Neue Mineralienfunde aus der Vulkaneifel, Mineralien-Welt 1/2001 New minerals approved by IMA CNMNC in August-September 2014
Hand Egon Künzel, Günter Blaß, Willi Schüller (2011) Mineralien - Bomben - Grottensteine: Der Nickenicher Weinberg. Lapis, 36, #7-8, 55-66
    • Daun
      • Üdersdorf
- New minerals approved by IMA CNMNC in August-September 2014 -Blass, G.; Graf, H.W., Neue Mineralienfunde aus der Vulkaneifel, Mineralien-Welt 1/2001
    • Mayen
      • Ettringen
        • Bellerberg volcano
in the collection of Christof Schäfer; Oberti, R., Boiocchi, M., Hawthorne, F.C., Ball, N.A., Blass, G. (2017): Ferri-obertiite from the Rothenberg quarry, Eifel volcanic complex (Germany): mineral data and crystal-chemistry of a new amphibole end-member. Mineralogical Magazine, 81, 641–651.
    • Mendig
      • Bell
Oberti, R., Boiocchi, M., Hawthorne, F.C.,Ball, N.A. and Blass, G. (2015) Ferri-obertiite, IMA 2015-079. CNMNC Newsletter No. 28, December 2015, page 1863; Mineralogical Magazine: 79: 1859–1864; Oberti, R., Boiocchi, M., Hawthorne, F.C., Ball, N.A., Blass, G. (2017): Ferri-obertiite from the Rothenberg quarry, Eifel volcanic complex (Germany): mineral data and crystal-chemistry of a new amphibole end-member. Mineralogical Magazine, 81, 641–651.
    • Niederzissen
      • Burgbrohl
Blass, G., Graf, H.W., Kolitsch, U., Neue Funde aus der Vulkaneifel - ein Rückblick auf die Sammelsaison 2002, Mineralien-Welt 13/5, 2003
    • Polch
      • Ochtendung
New minerals approved by IMA CNMNC in August-September 2014 - Blass, G., Graf, HW., Kolitsch, U., Sebold, D., Über neue Mineralfunde aus der Vulkaneifel, MW 6/2005
Mineral and/or Locality  
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