Opal (chloropal); Sulawesi, Indonesia; 600 g; unique piece

Opal (chloropal) from Sulawesi in Indonesia – 600 g unique piece

This unique specimen shows a massive Opal from Sulawesi in Indonesia with a weight of about 600 g. The piece has a natural, irregular shape with a light, partly weathered outer surface and a freshly broken interior displaying olive green to yellowish green tones. The fracture surface appears dense and homogeneous with a slightly waxy to dull luster, which is typical for compact Opal. Crystals are not developed; the material occurs in massive form and is well suited as a display specimen for collections of siliceous mineraloids as well as a decorative natural piece.

Geology & Origin

Opal is a hydrated form of silica with the idealized composition SiO₂ · nH₂O and is considered a mineraloid due to its amorphous internal structure. Typical hardness ranges from about 5.5 to 6.5 on the Mohs scale, and the material often shows a conchoidal to irregular fracture. Opal forms when silica-rich solutions deposit silica within cavities or fractures in rocks, gradually solidifying into compact Opal. Sulawesi is known as one of the Indonesian regions where Opal occurrences are found and is listed as a mineral locality in mineralogical databases such as Mindat.

Usage Instructions

This product is ideal as a collector's item, decorative element, teaching material, or for scientific and exhibition purposes.

Legal Notices

Safety

We accept no liability for damages resulting from improper and/or non-recommended use. Please carefully assess the suitability of the product before any alternative use.

Responsible Provider

Mikon Mineralienkontor GmbH
Steinslieth 11
D-37130 Gleichen OT Klein Lengden

Email: info@mikon-online.com