 | Friedrich Schoedler - 1872 - 654 pages
...manifold combinations. Only a comparatively small number, however, are employed for the extraction of copper. The Hardness of the minerals of this group...in considerable masses, and is worked for copper. Red Oxide of Copper (suboxide of copper, Cu20) crystallises very beautifully in distinct crystals of... | |
 | Geology - 1898 - 738 pages
...combinations and proportions of magnesium, iron, manganese, and aluminum, with hydrogen, silicon, and oxygen. The hardness of the minerals of this group ranges from 2 to 2.7. The members of the chlorite group are characterized by their green color, which is common to silicates... | |
 | Ernest Robertson Buckley - Building materials - 1898 - 894 pages
...combinations and proportions of magnesium, iron, manganese, and aluminum, with hydrogen, silicon, and oxygen. The hardness of the minerals of this group ranges from 2 to 2.7. The members of the chlorite group are characterized by their green color, which is common to silicates... | |
 | Ernest Robertson Buckley - Building stones - 1898 - 728 pages
...combinations and proportions of magnesium, iron, manganese, and aluminum, with hydrogen, silicon, and oxygen. The hardness of the minerals of this group ranges from 2 to 2.7. The members of the chlorite group arc characterized by their green color, which is common to silicates... | |
 | Wisconsin Geological and Natural History Survey - Geology - 1896 - 728 pages
...combinations and proportions of magnesium, iron, manganese, and aluminum, with hydrogen, silicon, and oxygen. The hardness of the minerals of this group ranges from 2 to 2.7. The members of the chlorite group are characterized by their green color, which is common to silicates... | |
 | Wisconsin Geological and Natural History Survey - Geology - 1898 - 830 pages
...combinations and proportions of magnesium, iron, manganese, and aluminum, with hydrogen, silicon, and oxygen. The hardness of the minerals of this group ranges from 2 to 2.7. The members of the chlorite group are characterized by their green color, which is common to silicates... | |
 | Missouri. Division of Geological Survey and Water Resources - Geology - 1903 - 810 pages
...combinations and proportions of magnesium, iron, manganese and aluminum, with hydrogen, silicon and oxygen. The hardness of the minerals of this group ranges from 2 to 2.7. The members of the chlorite group are characterized by their green color, which is common to silicates... | |
 | Missouri. Division of Geological Survey and Water Resources - Geology - 1904 - 526 pages
...combinations and proportions of magnesium, iron, manganese and aluminum, with hydrogen, silicon and oxygen. The hardness of the minerals of this group ranges from 2 to 2.7. The members of the chlorite group are characterized by their green color, which is common to silicates... | |
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CHLORITE. This group of minerals, in which is included a number of species, is composed of various combinations and proportions of magnesium, iron, manganese, and aluminum, with hydrogen, silicon, and oxygen. The hardness of the minerals of this group... 