 | | Journal (issue) | | exploration is largely done by local villagers, who mine selectively in creek beds. Although up to 20 ct/m3...showing the sample localities at Befotaka on Nosy-Bé island and Andovokonko on Ambato peninsula. The inset...metamorphic-type sapphires from the southern part of the island (cf. Milisenda et al., 2001). Genesis of the placer...sapphire deposits near Ambilobe, in the Antsiranana Province of northern Madagascar. In late Tertiary (?) or...presumably stimulated by other finds on the main island of Madagascar (Figures 12 and 13). On Nosy-Bé, |  | | Journal (issue) | | State, USA Copper Minerals in Chalcedony from Indonesia b THE JOURNAL OF GEMMOLOGY, 38(5), 202 3 Volume...Nephrite Jade from Washingto n State, USA Copper Mine rals in Chalcedon y from Indon esia ARTICLES The...Rossman Copper Minerals in Chalcedony from Obi Island, Indonesia 512 By Joel Ivey and Brendan M. Laurs 477...of the world. Total annual supply rose 2%, with mine production at a four-year high. Visit https://www...emeralds, Miranda Group’s business strategy and mine-to-market initiatives. Download the 48-page publication |  | | Journal (issue) | | Volume 37 / No. 3 / 2020 Characteristics of Chrysocolla Chalcedony Ivory Species Identification Stereoscopy...Catapleiite from Mont Saint-Hilaire, Québec, Canada | Chrysocolla Chalcedony from the Democratic Republic of Congo...Mongolia | Natrolite from Java, Indonesia | A Second Opal from Indonesia with an Insect Inclusion | Bicoloured...from Kazakhstan | Doublets Featuring Dioptase, Chrysocolla and Shattuckite from the Democratic Republic...describes the characteristics of chrysocolla chalcedony from Taiwan, Indonesia and USA. This pendant/brooch |  | | Report (issue) | | Bajo de la Alumbrera in Argentina, Grasberg in Indonesia, and Bingham in the United States.    3 Regional...along convergent plate-margin boundaries or in island-arc environments. The deposits are associated with...such as at the well-studied Grasberg deposit, Indonesia (for example, Sapiie and Cloos, 2004). 4   ...core. In some deposits, for example Grasberg, Indonesia, the low-grade core is a late-stage intrusion...might include malachite + azurite + cuprite + chrysocolla, with minor amounts of other minerals (for example |
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