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08342 - Beautiful 85.6 Inch Fibrous Black Arfvedsonite with Feldspar - Morocco Fezouata Ischyrhiza

SKU: 82187690252
4.9
USD128.25 USD165.25 Bay rate

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Ships within 48 hours · Estimated delivery Sep 16 - Sep 21

Description

Ischyrhiza

Pseudospyroceras

Rooted incisor specimen

Impressive complete specimen

Accessory troilite and schreiberstite

08342 - Beautiful 85.6 Inch Fibrous Black Arfvedsonite with Feldspar - Morocco Fezouata IschyrhizaArfvedsonite 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

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