Ch. 40: Opal

• Contents & Preface
• Ch. 1: Nature
• Ch. 2: Occurrence
• Ch. 3: Mining
• Ch. 4: Color
• Ch. 5: Luster
• Ch. 6: Hardness
• Ch. 7: Gravity
• Ch. 8: Optical Qualities
• Ch. 9: Electrical Properties
• Ch. 10: Cutting & Mounting
• Ch. 11: Value & Price
• Ch. 12: Imitation Gems
• Ch. 13: Superstitions
• Ch.14: Birthstones
• Ch. 15: Diamond
• Ch.16: Corundum
• Ch.17: Spinel
• Ch.18: Beryl
• Ch.19: Euclase
• Ch. 20: Phenacite
• Ch. 21: Chrysoberyl
• Ch. 22: Zircon
• Ch. 23: Tourmaline
• Ch. 24: Lepidolite
• Ch. 25: Spodumene
• Ch. 26: Topaz
• Ch. 27: Cyanite
• Ch. 28: Andalusite
• Ch. 29: Staurolite
• Ch. 30: Garnet
• Ch. 31: Chrysolite
• Ch. 32: Epidote
• Ch. 33: Vesuvianite
• Ch. 34: Iolite
• Ch. 35: Rutile
• Ch. 36: Titanite
• Ch. 37: Axumite
• Ch. 38: Samarskite
• Ch. 39: Quartz
• Ch. 40: Opal
• Ch. 41: Jade
• Ch. 42: Diopside
• Ch. 43: Hypersthene
• Ch. 44: Turquoise
• Ch. 45: Variscite & Callainite
• Ch. 46: Feldspar
• Ch. 47: Obsidian
• Ch. 48: Moldavite
• Ch. 49: Apatite
• Ch. 50: Fluorite
• Ch. 51: Hematite
• Ch. 52: Pyrite
• Ch. 53: Chlorastrolite (Copper)
• Ch. 54: Thomsonite (Mesolite)
• Ch. 55: Prehnite
• Ch. 56: Rhodonite
• Ch. 57: Zoisite & Serpentine
• Ch. 58: Malachite
• Ch. 59: Chrysocolla
• Ch. 60: Dioptase
• Ch. 61: Lapis Lazuli
• Ch. 62: Smithsonite
• Ch. 63: Alabaster
• Ch. 64: Amber
• Ch. 65: Jet
• Ch. 66: Pearl
• Ch. 67: Coral
• Index

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Deposits Diamond Gemological Properties Gemstones Gold History Mine Mining Production USA

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