Conversations on Geology; Comprising a Familiar Explanation of the Huttonian and Wernian Systems: The Mosaic Geology
by Granville Penn (9781150341144)

General Books publication date: 2009 Original publication date: 1828 Original Publisher: Printed for S. Maunder Subjects: Geology Science / Earth Sciences / General Science / Earth Sciences / Geology Notes: This is a black and white OCR reprint of the original. It has no illustrations and there may be typos or missing text. When you buy the General Books edition of this book you get free trial access to Million-Books.com where you can select from more than a million books for free. Excerpt: /;/ V 18 GEOLOGICAL CABINET. CONVERSATION SECOND. GEOLOGICAL CABINET. MRS. R. Well, I have procured, as I promised, the cabinet of specimens for you, and I expect you will prove good scholars, and do me credit. Christina. I confess I am a little disappointed in the appearance of this cabinet. The collections of minerals which I have seen are all much finer than those plain-looking gray stones. Mrs. R. True, my dear, but they were intended for a different purpose. What you have here are fragments of the great rocks which compose our hills and mountains, and form the crust of the globe, GRANITE. 19 so far as it has hitherto been examined. The minerals which you have seen in collections consist more of rare or fine specimens of gems, precious stones, and metals, that occur only in particular places, and are comparatively of less importance in Geology, though indispensable in mineralogy. Edward. I think I shall find it easy enough to learn all these. I know some of them already: here is sandstone, and marble, and flint, and the granite which they pave the streets with. MRS. R. Right, my dear; but examine a piece of this Granite more closely, and try to tell me what it is composed of. EDWARD. I see three sorts of stuff in it; one shining like silver, another white, and another red. Mrs. R. Every granite rock consists of these three sub- staces in various proportions. The silvery one, called Mica, is in the form of soft elastic scales, and in some sorts of...

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