Who They Are & What They Teach, Simmons & Ahsian. The 3rd edition of this classic adds 76 new stones not in previous editions. This comprehensive volume takes you deep into the world of crystals, and their uses for spiritual awakening and self-healing. With nearly 400 separate stones varieties including vivid color photographs and essays on each stone you will enjoy the clear, easy-to-understand information that helps you enjoy the beauty and benefits of the mineral realm. 560 pages.