Ferro Pargasite in Green Zoisite ゾイサイトのブラック パルガサイト 4.85 ct Octagon Cut 11.80 9.00 x 6.10 mm Tanzania max9428

Description

Ferro Pargasite in Green Zoisite ゾイサイトのブラック パルガサイト 4.85 ct Octagon Cut 11.80 9.00 x 6.10 mm Tanzania max9428

Ferro-pargasite フェロパラガサイト

Ferro-pargasite Is a black pargasite with formula {Na}{Ca2}{Fe2+4Al}(Al2Si6O22)(OH)2 and hardness of 5-6.

Ferro-Pargasite is defined as a pargasite group member with the following dominant elements:
A position: Na
C position: Fe as the dominant divalent cation and Al as the dominant trivalent cation.
W position: (OH) as the dominant anion.

Here it is included in green zoisite. From Tanzania