I LOVE unexpected finds! I went out searching for 40 million year old fossil sea urchins and sand dollars, and I ended up ...

There is growing evidence that these additives are often occluded within the crystal ... white fluorescent calcite—through the simultaneous incorporation of red, blue and green fluorescent ...

The "cloak" is made from two pieces of calcite crystal—a cheap ... it works best under green light. The researchers designed the cloak this way because the calcite can only be configured ...

And yet human culture blossomed there around 105,000 years ago, back when it was green, researchers say ... and 22 palm-sized or smaller calcite crystals, Wilkins and her colleagues report.