Opal, often regarded as one of the most dazzling minerals, can develop within a variety of natural structures, including ...

According to Sarah Hervé, the interpretive ranger for Petrified Forest National Park in northern Arizona, said the specimen in the photo is not opalized at all. Instead, it's closer to agate ...

In the case of petrified wood, these minerals tend to be silica, calcite, pyrite or another inorganic material, such as opal, according to the Quekett Microscopical Club, one of the world's oldest ...

The Virgin Rainbow is an opalized fossil, which means the shape and initial formation of the opal replaced a fossil, ... This is a similar process to how petrified wood is formed, ...

Petrified wood, geodes, opal and jasper shone in a variety of colors. From their exteriors, the gray and brown rocks are as dull as a russet potato. But sliced or cracked open, ...

This also cut off oxygen to the wood, preventing it from rotting. But over time, silica in the lava replaced the wood, turning it into agate, opal and quartz, creating a stone version of the original.

Gemologist Brian Berger purchased the Indonesian opal last year Brian Berger Amber has long been prized for not only its lush, fiery hues, but its elaborate contributions to Earth’s fossil record.

Whilst staying in Andamooka, South Australia, in 1966, searching for opals around the mouth of an opal mine ('noodling')I found a small stone tool made from petrified wood.

Petrified wood, geodes, opal and jasper shone in a variety of colors. From their exteriors, the gray and brown rocks are as dull as a russet potato. But sliced or cracked open, ...

In 1966 whilst staying in the opal-mining area of Andamooka,South Australia, looking for opals around the mouth of an opal mine (noodling)I found an aboriginal stone cutting implement made from ...

Petrified wood, geodes, opal and jasper shone in a variety of colors. From their exteriors, the gray and brown rocks are as dull as a russet potato. But sliced or cracked open, ...