Lab-created opals have near-identical chemical structures to natural opals. Though the average person likely can't tell the difference, the synthetic variety has a more uniform appearance.

The project utilises proven technology to capture biogas from the natural decomposition of organic material in the landfill.

Following is a transcript of the video. Narrator: High-quality black opal can cost over $10,000 per carat, making it one of the world's most expensive gemstones. But mining black opal isn't easy.

"Opal is taboo to Aboriginal people ... they remain in awe of the fossils and the stories they tell. "Their meaning is created partly by their context — not just by what they are as ...

OPAL Fuels Inc. (Nasdaq: OPAL) announced today that construction has commenced on a new landfill-gas-to-RNG facility at the Kirby Canyon Landfill, located in Santa Clara County, California. The new ...