ORIGINAL PAPER
Host-rock characteristics and geochemistry of the Rongkong Opal-C Mineraloid, North Luwu Regency, South Sulawesi Province, Indonesia
1
Universitas Muslim Indonesia
Submission date: 2023-07-10
Final revision date: 2023-09-28
Acceptance date: 2023-11-17
Publication date: 2024-03-27
Gospodarka Surowcami Mineralnymi – Mineral Resources Management 2024;40(1):233-246
KEYWORDS
TOPICS
ABSTRACT
Opal can be found in several locations, including America, Tanzania, Brazil, Mexico, East Africa, Indonesia and Australia, which is now the world’s top producer of black opal. One of the most economically valuable gems in the world is the mineraloid opal. In the Rongkong area, opal is found in the host rock of volcanic igneous rock, namely andesite. This study aims to determine the opal mineraloid host-rock’s microstructural characteristics and the elemental and compound content of the opal mineraloid host-rock’s geochemistry in the Rongkong area, Indonesia. The research took three samples in the field as large as hand specimens. The three samples were one host-rock sample and two opal mineraloid samples; the samples were then prepared and analyzed in the laboratory. Laboratory analysis was performed using SEM-EDS, XRF and petrographic analyses. The results of the SEM-EDS test analysis showed that most opal mineraloid carrier rock constituents are aluminum and oxide. This can be seen from the substantial Al and O content. In samples 1 and 2, Al, O, Ca and P with the highest composition of chemical compounds are Al2O3, CaO, and P2O5. The Rongkong opal mineraloid from Limbong Village, Rongkong District, North Luwu Regency, South Sulawesi, based on the results of XRF analysis, contains the chemical compounds SiO2, Al2O3, K2O, Fe2O3, CaO, TiO2, RuO2, SrO, MnO, V2O5, Rb2O, Ag2O and CuO. The content compound that is more dominant in opal mineraloids is SiO2 due to silicate enrichment in the forming of opal mineraloids.
ACKNOWLEDGEMENTS
We thank the Resource Development Research Institute (LP2S-UMI) for funding this research
METADATA IN OTHER LANGUAGES:
Polish
Charakterystyka skały macierzystej i geochemia minerałoidu Rongkong Opal-C, region Północnego Luwu, prowincja Południowe Sulawesi, Indonezja
opal-C, mineraloidy, fluorescencja rentgenowska, okręg Rongkong
Opal można znaleźć w kilku miejscach, w tym w Ameryce, Tanzanii, Brazylii, Meksyku, Afryce Wschodniej, Indonezji i Australii, która jest obecnie największym na świecie producentem czarnego opalu. Jednym z najcenniejszych ekonomicznie klejnotów na świecie jest opal mineraloidalny. W obszarze Rongkong opal znajduje się w skale macierzystej wulkanicznej skały magmowej, a mianowicie w andezycie. Niniejsze badanie ma na celu określenie charakterystyki mikrostrukturalnej skały macierzystej opalu oraz zawartości pierwiastków i związków w geochemii skały macierzystej opalu w obszarze Rongkong w Indonezji. W ramach badań pobrano w terenie trzy próbki wielkości próbek ręcznych. Trzy próbki stanowiły jedną próbkę skały macierzystej i dwie próbki mineraloidu opalu; próbki zostały następnie przygotowane i przeanalizowane w laboratorium. Analiza laboratoryjna została przeprowadzona przy użyciu SEM-EDS, XRF i analiz petrograficznych. Wyniki analizy testowej SEM-EDS wykazały, że większość składników skały nośnej opalu to aluminium i tlenek. Widać to po znacznej zawartości Al i O. W próbkach 1 i 2 Al, O, Ca i P o najwyższym składzie związków chemicznych to Al2O3, CaO i P2O5. Minerał opalowy Rongkong z Limbong Village, Rongkong District, North Luwu Regency, South Sulawesi, w oparciu o wyniki analizy XRF, zawiera związki chemiczne SiO2, Al2O3, K2O, Fe2O3, CaO, TiO2, RuO2, SrO, MnO, V2O5, Rb2O, Ag2O i CuO. Składnikiem, który jest bardziej dominujący w mineraloidach opalowych, jest SiO2 ze względu na wzbogacenie krzemianów w tworzeniu mineraloidów opalowych.
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