Fossil Friday: Opalized belemnite

Belemnites are an extinct order of cephalopods (“cephalo” meaning head and “pod” meaning leg) that lived during the Mesozoic era, some 200 to 65 million years ago. They were elongated organisms, resembling today’s squids, only tinier and cuter.

Meet ‘Virgin Rainbow’: quite possibly the finest opal ever unearthed

As a geologist, I’m not into gemstones and “pretty rocks” – but every once in a while, I see a rock so spectacular that it just blows my mind. Such is the case with “Virgin Rainbow”, a glorious opal unveiled by the South Australian Museum in Adelaide.

Opals on Mars hint at planet’s wet past

As a proud student in geophysics, I can tell you that opal is hydrated silicon dioxide mineral with many astounding properties, but it’s also water hydrated. Since ¬†water hydrated minerals have been found on Mars we are led to the logic conclusion that when these minerals was formed, there was water on Mars. Opals have been long prized for their