A Text book of Important Minerals And Rocks With Tables for the Determination O
A Text book of Important Minerals And Rocks With Tables for the Determination O
S E Samuel Escue Tillman
The book A Text book of Important Minerals And Rocks With Tables for the Determination O was written by author S E Samuel Escue Tillman Here you can read free online of A Text book of Important Minerals And Rocks With Tables for the Determination O book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is A Text book of Important Minerals And Rocks With Tables for the Determination O a good or bad book?
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The fine specimens are highly prized as gems. Specimens that rival any in the world in beauty have been found in Maine, at Paris and Hebron. Fairly fine specimens have been found in many other States of the Union. Ceylon and Brazil have also given celebrated crystals. Talc. Talc is a hydrous silicate of magnesium and nearly always contains a little iron. Generally occurs in foliated masses with a pearly luster, readily peeling off in layers ; masses also compact and of fine scales, occasionally... granular and less often fibrous. Talc is usually of a greenish- white color, but varies to other shades of green and to nearly pure white. In the laminated variety H. = i to 1. 5. The scales are flexible but not elastic. Yields water with difficulty when heated in closed tube. Infusible and not acted upon by acids. All varieties have a greasy feel. There is a number of varieties of this mineral, of which the more important will be mentioned. Talc. This term is commonly limited to the more dis- tinctly foliated varieties.
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