"It was long believed the blue stones could only be found ... Researchers discovered that the mineral makeup matched that of rocks from the Orcadian Basin, an area that encompasses northeastern ...

In general, mineral particles are small, having formed within confined areas such as lava flows or between grains of sediments. Large crystals found in geodes and other rocks are relatively rare.

Archaeologists working at Emperor Nero's grand palace in Rome, known as Domus Aurea, have unearthed an extremely rare and rather big Egyptian blue pigment ingot ...

The blue rocks, distinct in mineral composition, suggest geological processes or historical water activity, raising questions about Mars' history and the potential for life. The discovery of blue ...