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 |
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]