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Rondorfite

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Formula:
Ca
 
8
Mg(SiO
 
4
)
 
4
Cl
 
2
System:IsometricColour:orange brown to amber
Name:for the collectors Alice and Eugen Rondorf, who discovered the mineral
This page provides mineralogical data about Rondorfite.

Classification of Rondorfite

IMA status:Approved 1997
Strunz 8th edition ID:8/B.05-05
Nickel-Strunz 10th (pending) edition ID:9.AB.20

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

Type Locality:Caspar quarry, Bellerberg volcano, Ettringen, Mayen, Eifel, Rhineland-Palatinate, Germany
General Appearance of Type Material:minute grains to 0.5 mm
Year of Discovery:1979
Geological Setting of type material:thermally altered calcium-rich xenolites in rocks contacting leucite-rich lava slags
Associated Minerals at type locality:
TobermoriteThaumasiteTernesiteQuartzPortlandite
OlivineChlormayeniteMagnetiteLarniteHydrocalumite
HematiteEttringiteEllestaditeCuspidine

Physical Properties of Rondorfite

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

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

Chemical Properties of Rondorfite

Formula:
Ca
 
8
Mg(SiO
 
4
)
 
4
Cl
 
2
Simplified for copy/paste:Ca8Mg(SiO4)4Cl2
Essential elements:Ca, Cl, Mg, O, Si
All elements listed in formula:Ca, Cl, Mg, O, Si

Relationship of Rondorfite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.AB.05Trimerite
CaMn
2+
2
Be
 
3
(SiO
 
4
)
 
3
9.AB.10Larsenite
PbZnSiO
 
4
9.AB.15Esperite
PbCa
 
2
Zn
 
3
(SiO
 
4
)
 
3

Other Names for Rondorfite

Synonyms:
IMA1997-013
Other Languages:
German:Rondorfit
Simplified Chinese:罗道尔夫石
Traditional Chinese:羅道爾夫石

Other Information

Fluorescence in UV light:none
Health Warning: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

Search Engines:
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  • External Links:
  • Look for Rondorfite on Webmineral
  • Look for Rondorfite on Athena Mineralogy
  • Look for Rondorfite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Mineral Dealers:
  • SpiriferMinerals.com - high quality low prices
  • Fabre Minerals - search for Rondorfite specimens
  • Buy RARE Minerals from Rocks of Africa
  • Rare and Unusual minerals at Mineralogical Research Company
  • Buy minerals from YourMineralCollection
  • Buy from Dave Bunk Minerals
  • rare and unusual minerals mainly crystallized
  • Rondorfite specimens for sale - minfind.com
  • DAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.
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  • Localities for Rondorfite

    The 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. ? 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
     
    • 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.
    Russia
     
    • Northern Caucasus Region
      • Kabardino-Balkarian Republic
        • 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
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    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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