Precious Stones
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In our eReader you can find the full English version of the book. Read Precious Stones Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Precious Stones
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The history of its origin introduces us to so many features of interest in the consideration of the origin of the large groups of minerals formed by downward percolating water, that it has been described in detail when speaking of the origin of precious stones in general.
Chemically it is essentially silicon dioxide, but many specimens are found to contain some water, varying in amount from practically nothing till it approaches the quantity contained in Opal (q. V. ). The general appearance of... the mineral differs somewhat with this varying per- centage of water. Under the influence of solvents, such as alkaline solutions, it shows a greater readiness of solution than Quartz. Bands having different degrees of porosity are common.
It is of very wide distribution in rocks of volcanic origin, which have been subjected to some disintegration by water acting chemically. The best specimens come from the Faroe Islands, Iceland and India.
Chalcedony has been much used for vases, cups, beads, dishes, etc.
What to read after Precious Stones?
You can find similar books in the "Read Also" column, or choose other free books by Wilbert Goodchild to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The history of its origin introduces us to so many features of interest in the consideration of the origin of the large groups of minerals formed by downward percolating water, that it has been described in detail when speaking of the origin of precious stones in general.
Chemically it is essentially silicon dioxide, but many specimens are found to contain some water, varying in amount from practically nothing till it approaches the quantity contained in Opal (q. V. ). The general appearance of... the mineral differs somewhat with this varying per- centage of water. Under the influence of solvents, such as alkaline solutions, it shows a greater readiness of solution than Quartz. Bands having different degrees of porosity are common.
It is of very wide distribution in rocks of volcanic origin, which have been subjected to some disintegration by water acting chemically. The best specimens come from the Faroe Islands, Iceland and India.
Chalcedony has been much used for vases, cups, beads, dishes, etc.
What to read after Precious Stones?
You can find similar books in the "Read Also" column, or choose other free books by Wilbert Goodchild to read onlineMoreLess
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