4.1" Polished Green Pistachio Opal Heart - Madagascar

This is a polished heart made from green "pistachio" opal, collected from the Antananarivo Province of Madagascar. The specimen's polish really amplifies the stunning green and orange hues that this opal variety displays.

Green opal is an amorphous variety of quartz, with the chemical composition of SiO2 · nH2O. This hydrated silicate mineraloid has the associated chemical composition and lack of crystal structure that terms this mineral conglomerate as an opal.

During formation, microscopic holes form within the silica, forming secondary silica lamellae-like strings throughout, giving the rock its inner web-like appearance.
FOR SALE
$35 $29
DETAILS
SPECIES
Common Opal
LOCATION
Antananarivo Province, Madagascar
SIZE
4.1" wide
CATEGORY
SUB CATEGORY
ITEM
#249537