Barrerite
The Barrerite is a Minéral of rough Formule: (Na, K, Ca) 2 Al2 Si7 O18 7:00 2O. He was discovered in 1974 and was thus named by Passaglia & Pongiluppi.
Crystalline variety: Amma
Crystalline grid: a=13.643 b=18.200 c=17.842 Z=8
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