JADEITE JADE FROM SOUTH SULAWESI IN INDONESIA AND ITS GEOLOGICAL SIGNIFICANCE

• Main Author: , Nugroho Imam Setiawan
• Format: Article NonPeerReviewed
• Published: [Yogyakarta] : Geological Engineering Department, Faculty of Engi 2013
• Online Access: https://repository.ugm.ac.id/96426/; http://repository.ugm.ac.id/digitasi/index.php?module=cari_hasil_full&idbuku=4244
• Institution: Universitas Gadjah Mada

<p>Jade is considered as precious rock or gemstone. Jadeite jade is abundant in high-pressure metamorphic rock of garnet-jadeite-quartz rock, which found in Bantimala Compex of South Sulawesi, Indonesia. This contribution presents petrography, mineral chemistry, and metamorphic evolution of the garnet-jadeite-quartz rock from the South Sulawesi in Indonesia.<br /> The garnet-jadeite-quartz rock mainly consists of jadeite, garnet, quartz, phengite, epidote, with subordinate amounts of glaucophane and rutile. Large mass of fine-grained epidote, phengite, albite, with or without garnet occurs sporadically and visible to identified with naked eye, which probably pseudomorph after lawsonite. Allanite is abundant, occupies in the core of epidote grains. The allanite is also considered one of rare-earth elements-bearing mineral. Hence, rare-earth elements pattern of this rock gives highest value among other high-pressure metamorphic rocks from the same area.<br /> During metamorphism, the garnet-jadeite-quartz rock was experience in the phengite + jadeite + lawsonite + katophorite / winchite + quartz stability field at prograde stage. NCKFASHO pseudosection analysis and garnet-phengite thermometry suggest this rock has experience peak P-T condition at 2.2&ndash