DR. WYCKOFF'S monograph on “The Structure of Crystals” has, in the second edition, been revised so drastically that it is in effect a new book, since, although the experience gained from the ...

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.

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 ...