Tag Archive: geology


Extremely rare sulfur-rich blue-violet lava flowing from the Kawah Ijen Volcano in Indonesia.

Extremely rare sulfur-rich blue-violet lava flowing from the Kawah Ijen Volcano in Indonesia.

Extremely rare sulfur-rich blue-violet lava flowing from the Kawah Ijen Volcano in Indonesia.

A translucent green ocean jasper cabochon with floating orbs by Ocean Jasper Collectors.

Can you GROW an Opal?

Unlike other gems which are solid crystals, opal is made of silica nanoparticles which have to be stacked together in just the right way to produce their magnificent colors. By growing silica nanoparticles of the right size, synthetic opal can be grown. How realistic it looks is another question, though.

I’ve been there!

Las Cuevas de Mármol (aka The Marble Caves) and the General Carrera Lake lie between Chile and Argentina. Photo by Clane Gessel.

Another example of landscape agate – this one looks like a swamp.

A lovely example of landscape agate.

The Marmorslottet (Marble Castle) located in Mo i Rana, Norway, by photographer Therese Jaegtvik.

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