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
Samuel Escue Tillman
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G. = 2. 5 to 2. 8. Some of the earthy forms are very soft. Calcite is infusible, but when heated gives off carbon dioxide and is reduced to quick- lime, which when moistened gives alkaline reaction ; it is acted upon readily, with effervescence, by the mineral acids even when cold ; the solution in hydrochloric acid diluted gives a white precipitate upon addition of sulphuric acid. Calcite is one of the most abundant and widely distrib- uted of minerals, probably coming next to quartz in this r...e- spect. Some of the most important varieties are mentioned below. Limestone. This term is sometimes, and not improperly, applied to all calcspars, but it is generally limited to the granular and compact varieties. The granular include those of a distinct crystalline granular texture, often glistening owing to the facets of the grains ; architectural and statuary marbles are the best examples. The latter must be of fine grain, homogeneous texture, and pure color. The architec- 68 DESCRIPTIVE MINERALOGY.
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