Chalcedonies include many types of cryptocrystalline quartz gems and feature a number of different colors. Geologists can tell a chalcedony from the arrangement and structure of its crystals.

A new study has found that some elements of concrete, like quartz, can self-heal when exposed to nuclear radiation over time.

The defining feature of a crystal is its repeating geometric lattice structure. A: Start by identifying your intention. If you’re seeking love, rose quartz might resonate with you. For grounding ...