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Obertiite Root Name

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About Obertiite Root NameHide

09490470015069762241854.jpg
Roberta Oberti
Formula:
{A}{Na2}{Z2+3Z3+Ti}{Si8O22}O2
The obertiite minerals are WO2- dominant amphiboles defined with :
A(Na+K+2Ca)> 0.5 apfu,
X: Na dominant
ZTi > 0.5 apfu and
WO > 1.0 apfu

The positions X and Z refers to the IMA positions B and C respectively

The root-name mineral, obertiite is defined with Na, Mg, Al as the dominant elements in the A and Z positions (= IMA C position) respectively. Obertiite minerals with other dominant elements are named with pre-fixes in accordance with the guidelines established in the 2012 amphibole nomenclature.

On mindat.org we avoid using variables with the same symbol as elements and deviate from the IMA nomenclature in that we use X rather than B, Z rather than C and (OH,F,Cl,O) rather than W.
Name:
The obertiite root name is for Prof. Roberta Oberti, University of Pavia, Italy, for her contributions to the crystal chemistry of amphiboles.
Naturally occurring obertiite minerals from the Eifel area show a variable composition in the mangani-obertiite/ ferri-obertiite/ferro-ferri-obertiite range and the following Fe:Mn ratio ranges have been determined by WDS/EDS analyses:

Bellerberg 8 samples of Fe:Mn between 4:1 and 3:2
Emmelberg 1 sample Fe:Mn = 3:1
Herchenberg 1 sample Fe:Mn = 4:1
Nickenicher Sattel 1 sample Fe:Mn = 3:1
Nick. Weinberg 1 sample Fe:Mn = 3:1
Wannenköpfe 1 sample Fe:Mn = 3:1
Rothenberg 6 samples Fe:Mn between 3:1 and 3:2 (1 sample 1.6:1.5)

In addition, one sample from Caspar quarry shows a Fe:Mn ratio of ~ 7:1 (EMPA data).

Data from Günter Blaß and Christof Schäfer (2014).


Chemical Properties of Obertiite Root NameHide

Formula:
{A}{Na2}{Z2+3Z3+Ti}{Si8O22}O2

The obertiite minerals are WO2- dominant amphiboles defined with :
A(Na+K+2Ca)> 0.5 apfu,
X: Na dominant
ZTi > 0.5 apfu and
WO > 1.0 apfu

The positions X and Z refers to the IMA positions B and C respectively

The root-name mineral, obertiite is defined with Na, Mg, Al as the dominant elements in the A and Z positions (= IMA C position) respectively. Obertiite minerals with other dominant elements are named with pre-fixes in accordance with the guidelines established in the 2012 amphibole nomenclature.

On mindat.org we avoid using variables with the same symbol as elements and deviate from the IMA nomenclature in that we use X rather than B, Z rather than C and (OH,F,Cl,O) rather than W.

Relationship of Obertiite Root Name to other SpeciesHide

Other Members of this group:
Kaersutite Root Name{A}{Ca2}{Z2+3Z3+Ti}(Al2Si6O22)O2Mon.
Mangani-dellaventuraite{Na}{Na2}{MgMn3+2LiTi4+}Si8O22O2Mon. 2/m : B2/m
Mangano-mangani-ungarettiiteNaNa2(Mn2+2Mn3+3)(Si8O22)O2Mon.
Oxo-magnesio-hastingsiteNaCa2(Mg2Fe3+3)(Al2Si6)O22O2Mon. 2/m : B2/m
Oxo-pargasiteNaCa2(Mg2Al3)(Al2Si6)O22O2
Potassic-mangano-mangani-ungarettiiteKNa2(Mn2+2Mn3+3)(Si8O22)O2
Group Members:
Ferri-obertiite Na(Na2)(Mg3Fe3+Ti)(Si8O22)O2Mon. 2/m : B2/m
Ferro-ferri-obertiite NaNa2(Fe2+3Fe3+Ti)Si8O22O2Mon. 2/m : B2/m
Mangani-obertiite Na(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 Obertiite Root NameHide

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.
IMA Approvals - August 2009.
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.
Hawthorne, F.C., Ball, N.A., Czamanske, G.K. (2010) Ferro-obertiite, NaNa2(Fe2+Fe3+Ti)Si8O22O2, new mineral of the amphibole group from Coyote Peak, Humboldt County, California. The Canadian Mineralogist: 48: 301-306.
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., 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.
New minerals approved by IMA CNMNC in August-September 2014.

Internet Links for Obertiite Root NameHide

Localities for Obertiite Root NameHide

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
    • Ahrweiler
      • Brohltal
        • Burgbrohl
Blass, G., Graf, H.W., Kolitsch, U., Neue Funde aus der Vulkaneifel - ein Rückblick auf die Sammelsaison 2002, Mineralien-Welt 13/5, 2003
    • Mayen-Koblenz
      • Bell
[Ferri-obertiite] 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.
      • Mayen
        • Ettringen
          • Bellerberg volcano
[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, Na Na2(Mg3,Fe,Ti)Si8O28O2, American Mineralogist 85, 236-241
      • 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
      • Ochtendung
New minerals approved by IMA CNMNC in August-September 2014
    • Vulkaneifel
      • 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
USA
 
  • California
    • Humboldt Co.
      • Coastal Range
[Ferro-ferri-obertiite] IMA approvals - August 2009
 
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