ARFVEDSONITE | HUGE Gemstone Sphere | 105mm | #A7

Polished Gemstone Sphere of ARFVEDSONITE. 105mm - #A7 1795grams $270 Includes Stand! Location: Kola Peninsula, Russia Performs best under light with a magnificent display of internal fibers that flash blue, green, gold depending on the piece. Please note: Flashes can be a wide range of colors blue, grey, gold, green, even reddish. THIS IS NOT ASTROPHYLLITE but is tagged thus because of misinformed consumers. Arfvedsonite Inosilicates Amphiboles Formula (repeating unit) [Na][Na2][(Fe2+)4Fe3+][(OH)2|Si8O22] Pleochroism Strong: Blue-greens, yellow-browns, gray-violets Arfvedsonite 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