Minerals
Almarudite
almarudite
K(☐,Na)2(Mn,Fe,Mg)2[(Be,Al)3Si12]O30
Almarudite: Mineral information, data and localities. — via zh.mindat.org · Source
Overview
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(Mn2+,Fe2+,Mg)2(Be,Al)3[Si12O30], from the volcanic environment of the Eifel Mountains in Germany.
Identification characteristics
- Mohs hardness 6