Gypsum is a naturally occurring mineral which is often used in industrial processes and which in nature, if left alone for thousands of years, can grow into huge translucent, towering and eerie, ...

Colorado’s mining history is a rich one, filled with tales of gold and glory along with the more gruesome stories about those who met their demise on the quest for wealth. Most of the gold in Colorado ...

Calcium sulfate has three crystalline phases with various hydration levels 1: CaSO 4 ·2H 2 O (gypsum), CaSO 4 ·0.5H 2 O (bassanite) and CaSO 4 (anhydrite). Large natural (often evaporitic) deposits of ...

The mine of Naica, in the state of Chihuahua, Mexico, was opened in 1828 to mine for lead, zinc and silver ore. In 1910, a natural cave in the mine was discovered, which was later named Cueva de las ...

Sparkling hollows filled with lustrous crystals, dubbed geodes, are often perceived as small objects that can fit comfortably on a bookshelf. But some are more like gigantic cathedrals filled with a ...