Gem Silica (Batu Bacan)

Silicate

6.5–7Hardness (Mohs)

(Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂OChemistry

1Known origins & mines

Indonesia's most celebrated collector gem: vivid turquoise-blue chrysocolla in chalcedony from the Bacan islands, discovered commercially in 2008 and prized worldwide as Batu Bacan.

Known origins & mines

Batu Bacan Chrysocolla Mines · Indonesia

Active mining · Legendary locality

Indonesia's celebrated turquoise-blue gem silica from the Bacan islands, discovered commercially in 2008.…

Mineral family: Silicate

Charoite Rhodonite