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Gemstones and Their Origins

106,99 €*

Sofort verfügbar, Lieferzeit: 1-3 Tage

Produktnummer: 18e641058a83c44680a48f4c18ad12ac6b
Autor: Keller, P.C.
Themengebiete: Pegmatit growth metamorphism mineral resources ocean oceanic water
Veröffentlichungsdatum: 13.04.2012
EAN: 9781468466768
Sprache: Englisch
Seitenzahl: 144
Produktart: Kartoniert / Broschiert
Verlag: Springer US
Produktinformationen "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 crust of our planet, of which this volume discloses a small but exciting detail. The materials of the Earth's crust are the rocks. In this book, the author expounds on how they were formed, why they altered, why they became the cradles of precious gemstones, how they are categorized, and how they are now exploited by man. What initiates the growth of gemstones? How do they crystallize? Why do gemstones of the same species, originating from different sources, vary? What causes the occurrence of varieties? Why do diamonds, unlike other precious stones, occur not near the Earth's surface in its crust, but deep down beneath it in the upper mantle? These are only a few of the entrancing subjects discussed in this enlightening volume. The reader learns that the Earth is surprisingly alive and altering constantly-sometimes through slow and equable changes and at times by violent and tremendous cataclysms, events from which gemstones issue.

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