limonitic

Conichalcite is often found encrusted on to limonitic rocks that have yellow to red colors.

W0: no visible oxidation of metal or troilite, but may be noticeable in transmitted light a limonitic staining.

The ore mineral, cerargyrite, is located in a gangue of quartz with hematite, psilomelane, and limonitic material.

The earliest mining on the island has been dated to around 13,000 BC, when paleolithic miners dug a shaft at the site of the modern-era Tzines iron mine for the extraction of limonitic ochre.