Pure quartz, or “rock crystal” from Brazil. Source: Didier Descouens, CC BY-SA 4.0 Pick up a rock almost anywhere on Earth and chances are pretty good that there’s at least some quartz in it.

Giant amethyst geodes formed within a steady groundwater flow and at unexpectedly low crystallization temperatures, new study ...

Chalcedonies include many types of cryptocrystalline quartz ... like rocks. It's only when they are cut and polished that they obtain the brilliance and luster that gives them their value.

Earthquakes may cause gold nuggets to form in quartz by generating an electric field that attracts gold dissolved in fluid forced up from deep underground. Enormous gold nuggets are often ...

Ongoing fieldwork at the Mombaque prospect, located 1.6km to the east of the Maria Bonita porphyry gold discovery, has ...

Amethyst is a violet variety of quartz that has been used as a gemstone for many centuries and is a key economic resource in ...

Geodes are hollow rock formations often with quartz crystals, such as amethyst ... highlighting their scientific and natural value. However, limited knowledge of how these geodes formed has made ...

Third, magnetism in rocks can be used to estimate the age of a fossil site. This method uses the orientation of the Earth's magnetic field, which has changed through time, to determine ages for ...

The WSJ/College Pulse Best Value ranking lists schools in order of how quickly the difference between their graduates’ salaries and those of comparable high-school graduates pays back the ...

Those mines are now closed indefinitely, after Hurricane Helene dumped 2 feet of water on Spruce Pine, devastating the area.