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orange brown to amber
for the collectors Alice and Eugen Rondorf, who discovered the mineral
This page provides mineralogical data about Rondorfite.

Classification of Rondorfite

Approved 1997

9 : SILICATES (Germanates)
A : Nesosilicates
B : Nesosilicates without additional anions; cations in [4] and greater coordination URL:
Please feel free to link to this page.

Type Occurrence of Rondorfite

General Appearance of Type Material:
minute grains to 0.5 mm
Year of Discovery:
Geological Setting of Type Material:
thermally altered calcium-rich xenolites in rocks contacting leucite-rich lava slags

Physical Properties of Rondorfite

Diaphaneity (Transparency):
orange brown to amber
pale yellow
None Observed
3.03 g/cm3 (Measured)    

Crystallography of Rondorfite

Crystal System:
Class (H-M):
m3 (2/m 3) - Diploidal
Cell Parameters:
a = 15.08Å
Unit Cell Volume:
V 3,429.29 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction Data:
2.90 (40)
2.66 (100)
1.54 (50)

Chemical Properties of Rondorfite

Essential elements:
All elements listed in formula:

Relationship of Rondorfite to other Species


Other Names for Rondorfite

Name in Other Languages:
Simplified Chinese:罗道尔夫石
Traditional Chinese:羅道爾夫石

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 Rondorfite

Reference List:
Mihajlović, T., C. L. Lengauer, T. Ntaflos, U. Kolitsch and E. Tillmanns (2004): Two new minerals rondorfite, Ca8Mg[SiO4]4Cl2, and almarudite, K(ٱ,Na)2(Mn,Fe,Mg)2(Be,Al)3[Si12O30], and a study of iron-rich wadalite, Ca12[(Al8Si4Fe2)O32]Cl6, from the Bellerberg (Bellberg) volcano, Eifel, Germany. Neues Jahrbuch für Mineralogie, Abhandlungen 179, 265-294.

Rastsvetaeva, R.K., A. E. Zadov, N.V. Chukanov (2008) Crystal structure of low-symmetry rondorfite. Kristallografiya, 53, 226–232.

Dulski, M., Bulou, A., Marzec, K.M., Galuskin, E.V., Wrzalik, R. (2013): Structural characterization of rondorfite, calcium silica chlorine mineral containing magnesium in tetrahedral position [MgO4]6-, with the aid of the vibrational spectroscopies and fluorescence. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 101, 382-388.

Internet Links for Rondorfite

Localities for Rondorfite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Germany (TL)
  • Rhineland-Palatinate
    • Eifel
      • Mayen
        • Ettringen
          • Bellerberg volcano
T. Mihajlović, C. L. Lengauer, T. Ntaflos, U. Kolitsch and E. Tillmanns (2004): Two new minerals rondorfite, Ca8Mg[SiO4]4Cl2, and almarudite, K(ٱ,Na)2(Mn,Fe,Mg)2(Be,Al)3[Si12O30], and a study of iron-rich wadalite, Ca12[(Al8Si4Fe2)O32]Cl6, from the Bellerberg (Bellberg) volcano, Eifel, Germany. N. Jahrb. Mineral. Abh. 179, 265-294.
  • Northern Caucasus Region
    • Kabardino-Balkarian Republic
      • Baksan Valley
Galuskin, E.V., Galuskina, I.O., Kusz, J., Gfeller, F., Armbruster, T., Bailau, R., Dulski, M., Gazeev, V.M., Pertsev, N.N., Zadov, A.E., Dzieržanowski, P. (2015): Mayenite supergroup, part II: Chlorkyuygenite from Upper Chegem, northern Caucasus Kabardino-Balkaria, Russia, a new microporous mayenite supergroup mineral with “zeolitic” H2O. European Journal of Mineralogy. 27, 113-122
      • Verkhnechegemskaya caldera (Verkhni Chegem caldera; Upper Chegem caldera)
Galuskina, I.O., Galuskin, E.V., Dzierzanowski, P., Gazeev, V.M., Prusik, K., Pertsev, N.N., Winiarski, A., Zadov, A.E., and Wrzalik, R. (2010): American Mineralogist 95(8-9), 1305-1311.; American Mineralogist, Volume 94, pages 1361–1370, 2009; Galuskin, E.V., Galuskina, I.O., Gazeev, V.M., Dzierżanowski, P., Prusik, K., Pertsev, N.N., Zadov, A.E., Bailau, R. & Gurbanov, A.G. (2011): Megawite, CaSnO3: a new perovskite-group mineral from skarns of the Upper Chegem caldera, Kabardino-Balkaria, Northern Caucasus, Russia. Mineralogical Magazine, 75, 2563-2572.; Galuskina, I. O., Galuskin, E. V., Kusz, J., Dzierżanowski, P., Prusik, K., Gazeev, V. M., ... & Dubrovinsky, L. (2013). Dzhuluite, Ca3SbSnFe3+ 3O12, a new bitikleite-group garnet from the Upper Chegem Caldera, Northern Caucasus, Kabardino-Balkaria, Russia. European Journal of Mineralogy, 25(2), 231-239.
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