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Gemstones and Their Origins /
Each gem deposit-whether of primary origin in the parent rocks; or secondary as alluvial placers in valley floors, river gravels, or the sand of oceanic shelves presents an eloquent chronicle of the Earth's life story. It reveals to the expert the prodigious processes which formed the present...
| Clasificación: | Libro Electrónico |
|---|---|
| Autor principal: | |
| Formato: | Electrónico eBook |
| Idioma: | Inglés |
| Publicado: |
Boston, MA :
Springer US,
1990.
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| Temas: | |
| Acceso en línea: | Texto completo |
Tabla de Contenidos:
- I Gemstones Deposited by Water on the Earth's Surface
- 1. Gemstones Concentrated by Surface Waters: The Gem Gravels of Sri Lanka
- 2. Gemstones Formed from Surface Water: The Opals of Australia
- II Gemstones of Igneous-Hydrothermal Origin
- 3. Hydrothermal Gem Deposits: The Emerald Deposits of Colombia
- 4. Gemstones Formed in Pegmatites: Gem Pegmatites of Minas Gerais, Brazil
- 5. Gemstones Formed Directly from Molten Rock: The Ruby Deposits of Chanthaburi-Trat, Thailand
- III Gemstones Formed by Very High Temperatures and Pressures
- 6. Gemstones Formed by Low-Pressure Regional Metamorphism: The Ruby Deposits of Mogok, Burma
- 7. Gemstones Formed by High-Pressure Regional Metamorphism: The Jadeite Deposits of Tawmaw, Burma
- IV Gemstones Formed at Great Depths
- 8. Mantle Thrust Sheet Gem Deposits: The Zabargad Island, Egypt, Peridot Deposits
- 9. Diamond Pipes: The Diamond Deposits of Argyle, Western Australia.