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Rondorfite

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Formula:
Ca8Mg(SiO4)4Cl2
System:
Isometric
Colour:
orange brown to amber, ...
Name:
for the collectors Alice and Eugen Rondorf, who discovered the mineral
The colour difference results from different O/Cl ratio. The orange colour results from (1) Fe3+/Al substitution for Mg, (2) presence of atypical MgO4 tetrahedron, or (3) electronegativity. Non-equilibrium Cl positions and the presence of Ca-Cl bonds are confirmed (Dulski et al., 2015).


Classification of Rondorfite

Approved
Approval Year:
1997
9.AB.20

9 : SILICATES (Germanates)
A : Nesosilicates
B : Nesosilicates without additional anions; cations in [4] and greater coordination

Type Occurrence of Rondorfite

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

Physical Properties of Rondorfite

Vitreous
Diaphaneity (Transparency):
Translucent
Colour:
orange brown to amber, green
Streak:
pale yellow
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
3.03 g/cm3 (Measured)    

Crystallography of Rondorfite

Crystal System:
Isometric
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:
d-spacingIntensity
2.90 (40)
2.66 (100)
1.54 (50)

Chemical Properties of Rondorfite

Formula:
Ca8Mg(SiO4)4Cl2
Elements listed in formula:

Relationship of Rondorfite to other Species

9.AB.05TrimeriteCaBe3Mn22+(SiO4)3
9.AB.10LarsenitePbZnSiO4
9.AB.15EsperitePbCa2(ZnSiO4)3

Other Names for Rondorfite

Name in Other Languages:
German:Rondorfit
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.

Dulski, M. et al. (2015): Rondorfite-type structure—XPS and UV–vis study. Materials Research Bulletin 70, 920-927.

Internet Links for Rondorfite

mindat.org URL:
http://www.mindat.org/min-25682.html
Please feel free to link to this page.

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.
Czech Republic
 
  • Moravia (Mähren; Maehren)
    • South Moravia Region
      • Oslavany
Hršelová, P., Cempírek, J., Houzar, S., Sejkora, J. (2013): S,F,Cl-rich mineral assemblages from burned spoil heaps in the Rosice-Oslavany coalfield, Czech Republic. Can. Mineral.: 51(1): 171-188
Georgia
 
  • Shida Kartli Region
    • Southern Ossetia
      • Greater Caucasus Mountain Range
        • Kel’ volcanic area
          • Shadil-Khokh volcano
Galuskina, I.O., Krüger, B., Galuskin, E.V. ,Armbruster, T., Gazeev, V.M., Włodyka, R., Dulski, M. & Dzierżanowski, P. (2015): Fluorchegemite, Ca7(SiO4)3F2, a new mineral from the edgrewitebearing endoskarn zone of an altered xenolith in ignimbrites from Upper Chegem Caldera, Northern Caucasus, Kabardina-balkaria, Russia; Occurrence, crystal structure, and new data on the mineral assemblages. Canadian Mineralogist. 53, 325-344.
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.
in the collection of Christof Schäfer
Russia
 
  • 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; Bailau, R., Gałuskin, E. V., Gazeev, V. M., & Gałuskina, I. O. Raman investigation of potential new mineral-Fe 3-analogue of wadalite from calcareous-silicate xenoliths of the Upper Chegem caldera, Northern Caucasus, Russia.
          • Lakargi Mt.
Galuskina, I.O., Krüger, B., Galuskin, E.V. ,Armbruster, T., Gazeev, V.M., Włodyka, R., Dulski, M. & Dzierżanowski, P. (2015): Fluorchegemite, Ca7(SiO4)3F2, a new mineral from the edgrewitebearing endoskarn zone of an altered xenolith in ignimbrites from Upper Chegem Caldera, Northern Caucasus, Kabardina-balkaria, Russia; Occurrence, crystal structure, and new data on the mineral assemblages. Canadian Mineralogist. 53, 325-344.
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.
Galuskin, E. V.; Gazeev, V. M.; Lazic, B.; Armbruster, T.; Galuskina, I. O.; Zadov, A. E.; Pertsev, N. N.; Wrzalik, R.; Dzierzanowski, P.; Gurbanov, A. G. & Bzowska, G. (2009): Chegemite Ca7(SiO4)3(OH)2 - a new humite-group calcium mineral from the Northern Caucasus, Kabardino-Balkaria, Russia. European Journal of Mineralogy 21, 1045-1059.
Mineral and/or Locality  
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