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Rondorfite
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Caspar quarry, Bellerberg volcano, Ettringen, Mayen, Eifel, Rhineland-Palatinate, Germany
© Elmar Lackner
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| System: | Isometric | Colour: | 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 | |||||||||||||||||
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| 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 | |||||||||||||||||
| mindat.org URL: | http://www.mindat.org/min-25682.html Please feel free to link to this page. | |||||||||||||||||
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: |
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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: |
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Chemical Properties of Rondorfite | ||||||||||||||||||
| Formula: |
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| 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): - + | ||||||||||||||||||
Other Names for Rondorfite | ||||||||||||||||||
| Synonyms: |
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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. | |||||||||||||||||
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
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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.
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