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	Minerals
Formula	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