Thanks to additions during the glassmaking process, cadmium, vaseline, lead crystal, manganese, selenium, and custard glass ...

While digging at a private mine, a rare amethyst crystal emerged—deep purple, perfectly formed, and truly unexpected. It’s a once-in-a-lifetime find.

In a look ahead at a week of Cambridge and Somerville events, there’s Juneteenth parties, “Reading Frederick Douglass ...

Flowstone sparkles like a "sugar cookie" in Crystal Cave below Sequoia National Park. The cave reopened this month after natural disasters had left it inaccessible for four years. Inside Crystal Cave, ...