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Almarudite

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Almarudite
General
CategoryMineral
Formula
(repeating unit)		K([ ],Na)2(Mn,Fe,Mg)2(Be,Al)3[Si12O30]
IMA symbolAlr
Identification
ColorYellow to orange
CleavageNone Observed
FractureIrregular/Uneven
Mohs scale hardness6
LusterVitreous
StreakPale orange
DiaphaneityTransparent, Translucent
Specific gravity2.714

Almarudite (IMA symbol: Alr) is an extremely rare alkaline manganese beryllium silicate mineral of the cyclosilicates (ring silicates) class, with the chemical formula K([ ],Na)2(Mn,Fe,Mg)2(Be,Al)3[Si12O30], from the volcanic environment of the Eifel Mountains in Germany.

References

  1. 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.
  2. http://www.mindat.org/min-25681.html Mindat
  3. Mihajlović T., Lengauer C.L., Ntaflos Th., Kolitsch U. and Tillmanns E. 2004: Two new minerals, Rondorfite, Ca8Mg4Cl2, and Almarudite, K(,Na)2(Mn,Fe,Mg)2(Be,Al)3, and a study of iron-rich Wadalite, Ca12Cl6, from the Bellerberg volcano, Eifel, Germany, Neues Jahrbuch für Mineralogie - Abhandlungen, 179, pp. 265-294;


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