Almarudite
Almarudite (IMA symbol: Alr[1]) is an extremely rare alkaline manganese beryllium silicate mineral of the cyclosilicates (ring silicates) class, with the chemical formula K([ ],Na)2(Mn2+,Fe2+,Mg)2(Be,Al)3[Si12O30], from the volcanic environment of the Eifel Mountains in Germany.[2][3]
| Almarudite | |
|---|---|
| General | |
| Category | Mineral |
| Formula (repeating unit) | K([ ],Na)2(Mn2+,Fe2+,Mg)2(Be,Al)3[Si12O30] |
| IMA symbol | Alr |
| Identification | |
| Color | Yellow to orange |
| Cleavage | None Observed |
| Fracture | Irregular/Uneven |
| Mohs scale hardness | 6 |
| Luster | Vitreous |
| Streak | Pale orange |
| Diaphaneity | Transparent, Translucent |
| Specific gravity | 2.714 |
References
- Warr, L.N. (2021). "IMA-CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- http://www.mindat.org/min-25681.html Mindat
- Mihajlović T., Lengauer C.L., Ntaflos Th., Kolitsch U. and Tillmanns E. 2004: Two new minerals, Rondorfite, Ca8Mg[SiO4]4Cl2, and Almarudite, K([],Na)2(Mn,Fe,Mg)2(Be,Al)3[Si12O30], and a study of iron-rich Wadalite, Ca12[(Al8Si4Fe2)O32]Cl6, from the Bellerberg volcano, Eifel, Germany, Neues Jahrbuch für Mineralogie - Abhandlungen, 179, pp. 265-294;
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