08342 - Beautiful 85.6 Inch Fibrous Black Arfvedsonite with Feldspar - Morocco Fezouata Rooted incisor specimen

Rooted incisor specimen

Pseudospyroceras

It has some glued or filled fractures

Great collection of 7 specimens

Pribyl and Vanek 1985 (trilobite)

08342 - Beautiful 85.6 Inch Fibrous Black Arfvedsonite with Feldspar - Morocco Fezouata Rooted incisor specimenArfvedsonite is a sodium amphibole mineral with composition: [Na][Na2][(Fe2+)4Fe3+][(OH)2 Si8O22]. It crystallizes in the monoclinic prismatic crystal system and typically occurs as greenish black to bluish grey fibrous to radiating or stellate prisms. It is a rather rare mineral occurring in nepheline syenite intrusions and agpaitic (peralkaline) pegmatites and granites as the Golden Horn batholith in Okanogan County, Washington (type locality for