Tinzenite

Formula: Ca2Mn2+4Al4[B2Si8O30](OH)2, Formula based on the IMA 16-D proposal

Colour: Lemon-yellow, orange, red

Lustre: Vitreous

Hardness: 6½ – 7

Specific Gravity: 3.355 – 3.433

Crystal System: Triclinic

Member of: Axinite Group, Axinite-(Mn)-Tinzenite Series.

Name: Named after its discovery locality, Alpe Parsettens, near Tinzen, Grisons, Switzerland.

Type Locality: Parsettens Alp, Tinizong (Tinzen), Surses, Albula Region, Grisons, Switzerland