GEOKIMIA BATU PERMATA KRESNADANA PULAKI
DOI:
https://doi.org/10.23887/jstundiksha.v4i2.6052Abstract
Batu permata Kresnadana Pulaki telah lama dikenal orang sebagai salah satu batu permata unik dari Kawasan Suci Pulaki, Kecamatan Gerokgak Kabupaten Buleleng, namun kajian ilmiah terhadap batu permata ini belum ada yang melaporkan. Tujuan penelitian ini adalah mengkarakterisasi tiga cuplikan batu permata ‘Kresnadana” yang diambil dari lokasi Pangkung Jahe yang merupakan bagian dari kawasan Pulaki. Metode difraksi sinar X (XRD) dan fluorisensi sinar-X (XRF) digunakan untuk mengarakterisasi ketiga cuplikan batu permata tersebut. Hasil penelitian menunjukkan bahwa batu permata Pulaki tersusun fase utama kuarsa atau silika (lebih dari 50%) dan oksida-oksida penyerta seperti CaO, Fe2O3 dan Al2O3 serta unsur-unsur lainnya seperti Ba, Cu, Zn, Ni, V, Sr, dan Zr. Variasi komposisi unsur-unsur mayor dan minor menyebabkan adanya variasi warna dan tampilannya.
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