Quartz (variety chalcedony)

Mamuju area, Sulawesi Barat Province  Indonesia (2016)

Specimen size: 11.5 × 5.9 × 6.2 cm = 4.53” × 2.32” × 2.44”
Main crystal size: 0.6 × 0.5 cm = 0.24” × 0.20”