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This Specimen has been sold.
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2.1" Polished Green Pistachio Opal Stone - Madagascar
This is a polished palm stone made from green "pistachio" opal, collected in the Antananarivo Province of Madagascar. The polish of the specimen really amplifies the stunning green and orange hues that this mineral 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.
During formation, microscopic holes form within the silica, forming secondary silica lamellae-like strings throughout, giving the rock its inner web-like appearance.
SPECIES
Common Opal
LOCATION
Antananarivo Province, Madagascar
SIZE
2.1" wide
CATEGORY
SUB CATEGORY
ITEM
#249098
