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Author: P.C. Keller Publisher: Springer Science & Business Media ISBN: 1468466747 Category : Science Languages : en Pages : 144
Book Description
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.
Author: P.C. Keller Publisher: Springer Science & Business Media ISBN: 1468466747 Category : Science Languages : en Pages : 144
Book Description
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.
Author: A. Hyatt Verrill Publisher: Read Books Ltd ISBN: 1473356458 Category : Nature Languages : en Pages : 57
Book Description
A scientific history of gemstones and crystals around the world. Featuring the origin, symbolism, and uses of various precious stones. This detailed article explores the history of gemology and crystallography and is an excellent read for those wishing to deepen their knowledge of the subjects. First published in 1939, Precious Stones and Their Stories was written by A. Hyatt Verrill, a respected nature historian.
Author: Aḥmad ibn Yūsuf Tīfāshī Publisher: Scarecrow Press ISBN: 9780810832947 Category : Crafts & Hobbies Languages : en Pages : 298
Book Description
Samar Najm Abul Huda's translation of Ahmad ibn Yusuf al Tifaschi's study of gems. Born in 1184, Al Tifaschi first learned about gems from his father, and augmented his knowledge through readings of Aristotle, Theophrastus, and Pliny, as well as through extensive travels to mines and trading centers. In 1253, he wrote what later became known as the most 'methodical and complete' work on precious stones. Gemologists of today are still astounded by the advanced observations that Al Tifaschi made in this work.
Author: Robin Hansen Publisher: Princeton University Press ISBN: 0691214484 Category : Nature Languages : en Pages : 241
Book Description
Originally published: London: Natural History Museum, 2022, as: The Natural History Museum book of gemstones: a concise reference guide.
Author: Arthur Thomas Publisher: New Holland Australia(AU) ISBN: 9781847734846 Category : Precious stones Languages : en Pages : 256
Book Description
'Gemstones' is a guide to the fascinating world of precious and semi-precious crystals. As well as the naturally occurring minerals that have long been prized as gemstones, such as diamonds, emeralds and rubies, this book covers 'organic gems', including pearls, amber and coral, and synthetic gems and simulants, or imitations.
Author: P.C. Keller
Author: P.C. Keller
Author: A. Hyatt Verrill
Author: Charles William King
Author: George Frederick Kunz
Author: George Frederick Kunz
Author: Aḥmad ibn Yūsuf Tīfāshī
Author: Robin Hansen
Author: Edwin William Streeter
Author: Harry Emanuel
Author: Arthur Thomas