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Rondorfite

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About RondorfiteHide

Formula:
Ca8Mg(SiO4)4Cl2
Colour:
orange brown to amber, green
Lustre:
Vitreous
Specific Gravity:
3.03
Crystal System:
Isometric
Name:
Named in honor of Alice and Eugen Rondorf, of Neuwied, Germany, collectors who discovered the mineral with Bernd Ternes in 1979. They also discovered the mineral almarudite.
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 RondorfiteHide

Approved
Approval Year:
1997
First Published:
2004
9.AB.20

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

Physical Properties of RondorfiteHide

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

Chemical Properties of RondorfiteHide

Formula:
Ca8Mg(SiO4)4Cl2

Crystallography of RondorfiteHide

Crystal System:
Isometric
Class (H-M):
m3 (2/m 3) - Diploidal
Cell Parameters:
a = 15.08 Å
Unit Cell V:
3,429.29 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.90 (40)
2.66 (100)
1.54 (50)

Type Occurrence of RondorfiteHide

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
Associated Minerals at Type Locality:
Reference:
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) volcan

Synonyms of RondorfiteHide

Other Language Names for RondorfiteHide

German:Rondorfit
Simplified Chinese:罗道尔夫石
Traditional Chinese:羅道爾夫石

Common AssociatesHide

Associated Minerals Based on Photo Data:
Ellestadite3 photos of Rondorfite associated with Ellestadite on mindat.org.
Chegemite1 photo of Rondorfite associated with Chegemite on mindat.org.
Hydrogarnet1 photo of Rondorfite associated with Hydrogarnet on mindat.org.
Larnite1 photo of Rondorfite associated with Larnite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.AB.05TrimeriteCaMn2+2Be3(SiO4)3Mon. 2/m : P21/m
9.AB.10LarsenitePbZnSiO4Orth. mm2 : Pna21
9.AB.15EsperitePbCa2Zn3(SiO4)3Mon. 2/m : P21/b

Fluorescence of RondorfiteHide

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 RondorfiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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., Zadov, A.E., Chukanov, N.V. (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., Bilewska, K., Wojtyniak, M., Szade J., Kusz, J., Nowak, A., Wrzalik, R., Kubacki, J., Galuskin, E.V. (2015) Rondorfite-type structure—XPS and UV–vis study. Materials Research Bulletin: 70: 920-927.

Internet Links for RondorfiteHide

Localities for RondorfiteHide

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.
Czech Republic
 
  • 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
Germany (TL)
 
  • Rhineland-Palatinate
    • 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.
South 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.
Mineral and/or Locality  
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