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Quartz


Quartz : SiO2

Photo Copyright © Photo & Collection of Martins da Pedra  - This image is copyrighted. Unauthorized reproduction prohibited.
Locality: M'banza Congo (Mbanza Congo; Mbanza Kongo; San Salvador; São Salvador; São Salvador do Congo), Zaire Province, Angola
Geode (full) cut and polished with 6cm of diameter - July of 1974

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