Ferri-obertiite
This page is currently not sponsored. Click here to sponsor this page.
About Ferri-obertiite
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
Member of:
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).
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-obertiite
Approved
Approval Year:
2015
First Published:
2017
9.DE.25
9 : SILICATES (Germanates)
D : Inosilicates
E : Inosilicates with 2-periodic double chains, Si4O11; Clinoamphiboles
9 : SILICATES (Germanates)
D : Inosilicates
E : Inosilicates with 2-periodic double chains, Si4O11; Clinoamphiboles
Physical Properties of Ferri-obertiite
Colour:
Pink-orange
Optical Data of Ferri-obertiite
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.
and does not take into account mineral colouration.
Surface Relief:
High
Chemical Properties of Ferri-obertiite
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.
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-obertiite
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)°
β = 104.142(2)°
Ratio:
a:b:c = 0.546 : 1 : 0.295
Unit Cell V:
900.58 ų
Z:
2
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
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-obertiite
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(Na0.76K0.22)Σ0.98B(Na1.61Ca0.35Mn2+0.04)Σ2.00C(Mg3.58Mn2+0.11Fe3+0.62Ti4+0.66Cr3+0.01Zn0.01Ni0.01)Σ5.00T(Si7.82Ti4+0.12Al0.06)Σ8.00O22W[O1.26F0.55(OH)0.19]Σ2.00
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-obertiite
Relationship of Ferri-obertiite to other Species
Member of:
Other Members of this group:
Ferro-ferri-obertiite | NaNa2(Fe2+3Fe3+Ti)Si8O22O2 | Mon. 2/m : B2/m |
Mangani-obertiite | Na(Na2)(Mg3Mn3+Ti)(Si8O22)O2 | Mon. 2/m : B2/m |
Unnamed (possible K-analogue of Ferri-obertiite) | KNa2[(Mg,Fe,Na)3Fe3+(Ti,Fe)]Si8O22(O,F)2 |
Related Minerals - Nickel-Strunz Grouping
9.DE. | Clino-suenoite | □{Mn2+2}{Mg5}(Si8O22)(OH)2 | Mon. 2/m : B2/m |
9.DE.05 | Cummingtonite | ☐{Mg2}{Mg5}(Si8O22)(OH)2 | Mon. |
9.DE.05 | Clino-holmquistite Root Name | ☐{Li2}{Z2+3Z3+2}(Si8O22)(OH,F,Cl)2 | Mon. |
9.DE.05 | Grunerite | ☐{Fe2+2}{Fe2+5}(Si8O22)(OH)2 | Mon. 2/m : B2/m |
9.DE.05 | Permanganogrunerite | ☐{Mn2+2}{Mn2+5}(Si8O22)(OH)2 | Mon. |
9.DE.05 | Ferri-fluoro-leakeite | {Na}{Na2}{Mg2Fe3+2Li}(Si8O22)F2 | Mon. 2/m : B2/m |
9.DE.10 | Actinolite | ☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2 | Mon. 2/m : B2/m |
9.DE.10 | Ferri-tschermakite | ☐{Ca2}{Mg3Fe3+2}(Al2Si6O22)(OH)2 | Mon. |
9.DE.10 | Ferro-actinolite | ☐{Ca2}{Fe2+5}(Si8O22)(OH)2 | Mon. |
9.DE.10 | Ferro-hornblende | ☐{Ca2}{Fe2+4Al}(AlSi7O22)(OH)2 | Mon. |
9.DE.10 | Ferro-tschermakite | ☐{Ca2}{Fe2+3Al2}(Al2Si6O22)(OH)2 | Mon. 2/m : B2/m |
9.DE.10 | Joesmithite | {Pb}{Ca2}{Mg3Fe3+2}(Be2Si6O22)(OH)2 | Mon. |
9.DE.10 | Magnesio-hornblende | ☐{Ca2}{Mg4Al}(AlSi7O22)(OH)2 | Mon. |
9.DE.10 | Tremolite | ☐{Ca2}{Mg5}(Si8O22)(OH)2 | Mon. 2/m : B2/m |
9.DE.10 | Tschermakite | ☐(Ca2)(Mg3Al2)(Al2Si6O22)(OH)2 | Mon. 2/m : B2/m |
9.DE.10 | Cannilloite | Ca(Ca2)(Mg4Al)(Al3Si5O22)(OH)2 | Mon. |
9.DE.10 | Fluoro-cannilloite | {Ca}{Ca2}{Mg4Al}(Al3Si5O22)(F,OH)2 | Mon. |
9.DE.10 | Parvo-manganotremolite | ☐{CaMn2+}{Mg5}(Si8O22)(OH)2 | Mon. 2/m : B2/m |
9.DE.10 | Fluoro-tremolite | ☐{Ca2}{Mg5}(Si8O22)F2 | Mon. 2/m : B2/m |
9.DE.15 | Edenite | {Na}{Ca2}{Mg5}(AlSi7O22)(OH)2 | Mon. |
9.DE.15 | Ferro-edenite | {Na}{Ca2}{Fe2+5}(AlSi7O22)(OH)2 | Mon. |
9.DE.15 | Ferro-kaersutite | {Na}{Ca2}{Fe2+3AlTi}(Al2Si6O22)O2 | Mon. |
9.DE.15 | Ferro-pargasite | {Na}{Ca2}{Fe2+4Al}(Al2Si6O22)(OH)2 | Mon. |
9.DE.15 | Hastingsite | {Na}{Ca2}{Fe2+4Fe3+}(Al2Si6O22)(OH)2 | Mon. |
9.DE.15 | Kaersutite | {Na}{Ca2}{Mg3AlTi}(Al2Si6O22)O2 | Mon. |
9.DE.15 | Magnesio-hastingsite | {Na}{Ca2}{Mg4Fe3+}(Al2Si6O22)(OH)2 | Mon. |
9.DE.15 | Pargasite | {Na}{Ca2}{Mg4Al}(Al2Si6O22)(OH)2 | Mon. |
9.DE.15 | Sadanagaite | {Na}{Ca2}{Mg3Al2}(Si5Al3O22)(OH)2 | Mon. |
9.DE.15 | Fluoro-edenite | {Na}{Ca2}{Mg5}(AlSi7O22)(F,OH)2 | Mon. 2/m : P2/m |
9.DE.15 | Potassic-ferro-ferri-sadanagaite | {K}{Ca2}{Fe2+3Fe3+2}(Al3Si5O22)(OH)2 | Mon. |
9.DE.15 | Potassic-sadanagaite | {K}{Ca2}{Mg3Al2}(Al3Si5O22)(OH)2 | Mon. |
9.DE.15 | Potassic-pargasite | {K}{Ca2}{Mg4Al}(Al2Si6O22)(OH)2 | Mon. |
9.DE.15 | Potassic-ferro-sadanagaite | {K}{Ca2}{Fe2+3Al2}(Al3Si5O22)(OH)2 | Mon. |
9.DE.15 | Magnesio-fluoro-hastingsite | {Na}{Ca2}{Mg4Fe3+}(Al2Si6O22)F2 | Mon. 2/m : B2/m |
9.DE.15 | Potassic-fluoro-hastingsite | {K}{Ca2}{Fe2+4Fe3+}(Al2Si6O22)(F,OH)2 | Mon. 2/m : B2/m |
9.DE.15 | Potassic-chloro-hastingsite | {K}{Ca2}{Fe2+4Fe3+}(Al2Si6O22)(Cl,OH)2 | Mon. 2/m : B2/m |
9.DE.15 | Fluoro-pargasite | {Na}{Ca2}{Mg4Al}(Al2Si6O22)(F,OH)2 | Mon. 2/m : B2/m |
9.DE.15 | Parvo-mangano-edenite | {Na}{CaMn2+}{Mg5}(AlSi7O22)(OH)2 | Mon. 2/m : B2/m |
9.DE.15 | Potassic-chloro-pargasite | {K}{Ca2}{Mg4Al}(Al2Si6O22)(Cl,OH)2 | |
9.DE.15 | Potassic-ferro-chloro-edenite | {K}{Ca2}{Fe2+5}(AlSi7O22)(Cl,OH)2 | |
9.DE.15 | Potassic-magnesio-hastingsite | {K}{Ca2}{Mg4Fe3+}(Al2Si6O22)(OH)2 | Mon. 2/m : B2/m |
9.DE.15 | Potassic-ferro-pargasite | {K}{Ca2}{Fe2+4Al}(Al2Si6O22)(OH)2 | Mon. 2/m : B2/m |
9.DE.15 | Chromio-pargasite | {Na}{Ca2}{Mg4Cr3+}(Al2Si6O22)(OH)2 | Mon. 2/m : B2/m |
9.DE.15 | Potassic-fluoro-pargasite | {K}{Ca2}{Mg4Al}(Al2Si6O22)F2 | Mon. 2/m : B2/m |
9.DE.15 | Ferri-kaersutite | NaCa2(Mg3Fe3+Ti)(Al2Si6O22)O2 | Mon. 2/m : B2/m |
9.DE.15 | Vanadio-pargasite | NaCa2(Mg4V)(Al2Si6)O22(OH)2 | Mon. 2/m : B2/m |
9.DE.20 | Ferro-taramite | Na(CaNa)(Fe2+3Al2)(Al2Si6O22)(OH)2 | Mon. 2/m : B2/m |
9.DE.20 | Barroisite | ☐{CaNa}{Mg3Al2}(AlSi7O22)(OH)2 | Mon. |
9.DE.20 | Ferro-ferri-barroisite | ☐(CaNa)(Fe2+3Fe3+2)(AlSi7O22)(OH)2 | |
9.DE.20 | Ferro-ferri-winchite | ☐[CaNa][Fe2+4(Fe3+,Al)]Si8O22(OH)2 | |
9.DE.20 | Ferri-barroisite | ☐(CaNa)(Mg3Fe3+2)(AlSi7O22)(OH)2 | |
9.DE.20 | Ferro-ferri-taramite | Na(CaNa)(Fe2+3Fe3+2)(Al2Si6O22)(OH)2 | |
9.DE.20 | Ferro-ferri-katophorite | Na(NaCa)(Fe2+4Fe3+)(Si7Al)O22(OH)2 | Mon. 2/m : B2/m |
9.DE.20 | Ferro-barroisite | ☐{CaNa}{Fe2+3Al2}(AlSi7O22)(OH)2 | Mon. 2/m : B2/m |
9.DE.20 | Ferro-richterite | {Na}{CaNa}{Fe2+5}(Si8O22)(OH)2 | Mon. |
9.DE.20 | Ferro-winchite | ☐{CaNa}{Fe2+4Al}(Si8O22)(OH)2 | Mon. |
9.DE.20 | Ferro-katophorite | {Na}{CaNa}{Fe2+4Al}[(AlSi7)O22](OH)2 | |
9.DE.20 | Ferri-katophorite | Na(CaNa)(Mg4Fe3+)(AlSi7O22)(OH)2 | Mon. |
9.DE.20 | Ferri-taramite | Na(CaNa)(Mg3Fe3+2)(Al2Si6O22)(OH)2 | Mon. |
9.DE.20 | Magnesiotaramite | {Na}{CaNa}{Mg3AlFe3+}(Al2Si6O22)(OH)2 | Mon. |
9.DE.20 | Richterite | {Na}{NaCa}{Mg5}(Si8O22)(OH)2 | Mon. 2/m : B2/m |
9.DE.20 | Winchite | ☐{CaNa}{Mg4Al}(Si8O22)(OH)2 | Mon. 2/m |
9.DE.20 | Taramite | {Na}{CaNa}{Mg3Al2}(Al2Si6O22)(OH)2 | Mon. 2/m : B2/m |
9.DE.20 | Fluoro-richterite | {Na}{CaNa}{Mg5}(Si8O22)(F,OH)2 | Mon. 2/m |
9.DE.20 | Katophorite | {Na}{CaNa}{Mg4Al}[(AlSi7)O22](OH)2 | Mon. 2/m : B2/m |
9.DE.20 | Potassic-fluoro-richterite | {K}{CaNa}{Mg5}(Si8O22)(F,OH)2 | Mon. |
9.DE.20 | Potassic-richterite | {K}{CaNa}{Mg5}Si8O22(OH)2 | Mon. 2/m : B2/m |
9.DE.20 | Ferri-ghoseite | ☐[Mn2+Na][Mg4Fe3+]Si8O22(OH)2 | Mon. 2/m |
9.DE.20 | Ferri-winchite | ☐[CaNa][Mg4(Fe3+,Al)]Si8O22(OH)2 | Mon. 2/m : B2/m |
9.DE.20 | Fluoro-taramite | {Na}{CaNa}{Mg3Al2}(Al2Si6O22)F2 | Mon. 2/m : B2/m |
9.DE.20 | Fluoro-katophorite | Na(CaNa)(Mg4Al)(AlSi7O22)F2 | Mon. |
9.DE.20 | Ferri-fluoro-katophorite | Na(CaNa)(Mg4Fe3+)(AlSi7O22)F2 | Mon. 2/m : B2/m |
9.DE.25 | Arfvedsonite | [Na][Na2][Fe2+4Fe3+]Si8O22(OH)2 | Mon. 2/m : B2/m |
9.DE.25 | Eckermannite | NaNa2(Mg4Al}Si8O22(OH)2 | Mon. 2/m : B2/m |
9.DE.25 | Ferro-eckermannite | NaNa2(Fe2+4Al)Si8O22(OH)2 | Mon. |
9.DE.25 | Ferro-glaucophane | ◻[Na2][Fe2+3Al2]Si8O22(OH)2 | Mon. |
9.DE.25 | Glaucophane | ◻[Na2][Mg3Al2]Si8O22(OH)2 | Mon. |
9.DE.25 | Potassic-mangani-leakeite | [(Na,K)][Na2][Mg2Mn3+2Li]Si8O22(OH)2 | Mon. |
9.DE.25 | Mangano-ferri-eckermannite | {Na}{Na2}{Mn2+4Fe3+}Si8O22(OH)2 | Mon. |
9.DE.25 | Ferri-leakeite | [Na][Na2][Mg2Fe3+2Li]Si8O22(OH)2 | Mon. |
9.DE.25 | Magnesio-riebeckite | ◻{Na2}{Mg3Fe3+2}(Si8O22)(OH)2 | Mon. |
9.DE.25 | Magnesio-arfvedsonite | {Na}{Na2}{Mg4Fe3+}(Si8O22)(OH)2 | Mon. 2/m : B2/m |
9.DE.25 | Nybøite | NaNa2(Mg3Al2)(AlSi7O22)(OH)2 | Mon. 2/m : B2/m |
9.DE.25 | Riebeckite | ◻[Na2][Fe2+3Fe3+2]Si8O22(OH)2 | Mon. 2/m : B2/m |
9.DE.25 | Mangano-mangani-ungarettiite | NaNa2(Mn2+2Mn3+3)(Si8O22)O2 | Mon. |
9.DE.25 | Ferro-ferri-nybøite | NaNa2[(Fe2+3,Mg)Fe3+2](AlSi7O22)(OH)2 | Mon. 2/m : B2/m |
9.DE.25 | Clino-ferro-ferri-holmquistite | ◻{Li2}{Fe2+3Fe3+2}(Si8O22)(OH)2 | Mon. 2/m : B2/m |
9.DE.25 | Ferri-nybøite | NaNa2(Mg3Fe3+2](AlSi7O22)(OH)2 | Mon. |
9.DE.25 | Ferro-ferri-leakeite | [Na][Na2][Fe2+2Fe3+2Li]Si8O22(OH)2 | Mon. |
9.DE.25 | Ferro-ferri-fluoro-leakeite | Na(Na2)(Fe2+2Fe3+2Li)(Si8O22)(F)2 | Mon. |
9.DE.25 | Sodic-ferri-clinoferroholmquistite | Na0.5{Li2}{Fe2+3Fe3+2}(Si8O22)(OH)2 | Mon. |
9.DE.25 | Magnesio-fluoro-arfvedsonite | [Na][Na2][Mg4Fe3+][Si8O22](F,OH)2 | Mon. |
9.DE.25 | Ferri-pedrizite | [Na][Li2][Mg2Fe3+2Li]Si8O22(OH)2 | Mon. |
9.DE.25 | Potassic-ferri-leakeite | [K][Na2][Mg2Fe3+2Li]Si8O22(OH)2 | Mon. 2/m : B2/m |
9.DE.25 | Fluoro-nybøite | NaNa2(Mg3Al2)(AlSi7O22)(F,OH)2 | Mon. 2/m : B2/m |
9.DE.25 | Mangani-dellaventuraite | {Na}{Na2}{MgMn3+2LiTi4+}Si8O22O2 | Mon. 2/m : B2/m |
9.DE.25 | Fluoro-pedrizite | NaLi2(Mg2Al2Li)(Si8O22)F2 | Mon. 2/m : B2/m |
9.DE.25 | Potassic-arfvedsonite | [(K,Na)][Na2][Fe2+4Fe3+]Si8O22(OH)2 | Mon. 2/m : B2/m |
9.DE.25 | Mangani-obertiite | Na(Na2)(Mg3Mn3+Ti)(Si8O22)O2 | Mon. 2/m : B2/m |
9.DE.25 | Potassic-magnesio-fluoro-arfvedsonite | [(K,Na)][Na2][Mg4Fe3+][Si8O22][(F,OH)2] | |
9.DE.25 | Ferro-ferri-pedrizite | [Na][Li2][Fe2+2Fe3+2Li]Si8O22(OH)2 | Mon. 2/m : B2/m |
9.DE.25 | Potassic-magnesio-arfvedsonite | [K][Na2][Mg4Fe3+]Si8O22(OH)2 | Mon. 2/m : B2/m |
9.DE.25 | Pedrizite | NaLi2(LiMg2Al2)(Si8O22)(OH)2 | Mon. 2/m : B2/m |
9.DE.25 | Ferro-pedrizite | NaLi2(Fe2+2Al2Li)Si8O22(OH)2 | Mon. 2/m : B2/m |
9.DE.25 | Ferro-fluoro-pedrizite | {Na}{Li2}{Fe2Al2Li}(Al2Si6O22)F2 | Mon. 2/m : B2/m |
9.DE.25 | Fluoro-leakeite | NaNa2(Mg2Al2Li)(Si8O22)F2 | Mon. 2/m : B2/m |
9.DE.25 | Ferro-ferri-obertiite | NaNa2(Fe2+3Fe3+Ti)Si8O22O2 | Mon. 2/m : B2/m |
Other Information
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-obertiite
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-obertiite
mindat.org URL:
https://www.mindat.org/min-46414.html
Please feel free to link to this page.
Please feel free to link to this page.
External Links:
Mineral Dealers:
Localities for Ferri-obertiite
Locality List




All localities listed without proper references should be considered as questionable.
Germany | |
| Blass, G., Graf, H.W., Kolitsch, U., Neue Funde aus der Vulkaneifel - ein Rückblick auf die Sammelsaison 2002, Mineralien-Welt 13/5, 2003 |
| 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 | |
| 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 |
| 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. |
| 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. |
| - New minerals approved by IMA CNMNC in August-September 2014 -Blass, G.; Graf, H.W., Neue Mineralienfunde aus der Vulkaneifel, Mineralien-Welt 1/2001 |
Caspar quarry, Bellerberg volcano, Ettringen, Mayen, Mayen-Koblenz, Rhineland-Palatinate, Germany