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Rondorfite

Big Photo

Ettringer Bellerberg Mt., Ettringen, Mayen, Eifel Mts, Rhineland-Palatinate, Germany
© Elmar Lackner

Show Rondorfite Photos (4)
Formula:
Ca
 
8
Mg[Cl
 
2
|(SiO
 
4
)
 
4
]
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:Ettringer Bellerberg Mt., Ettringen, Mayen, Eifel Mts, 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
OlivineMayeniteMagnetiteLarniteHydrocalumite
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)

Chemical Properties of Rondorfite

Formula:
Ca
 
8
Mg[Cl
 
2
|(SiO
 
4
)
 
4
]
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
PbZn[SiO
 
4
]
9.AB.15Esperite
PbCa
 
3
Zn
 
4
[SiO
 
4
]
 
4

Other Names for Rondorfite

Synonyms:
IMA1997-013
Other Languages:
German:Rondorfit

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, 2008, Vol. 53, No. 2, pp. 226–232.

Articles/Blogs about Rondorfite

Internet Links for Rondorfite

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    Localities for Rondorfite

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    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.
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    (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 Mts
        • Mayen
          • Ettringen
    		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
        • Verkhnechegemskiy volcanic structure
    		A. E. Zadov data
    Mineral and/or Locality
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