 ... The slate from this quarry is very dark gray with a greenish hue, and to' the unaided eye has a granular sparkling crystalline texture and a roughish, but very lustrous, cleavage surface. It is slightly graphitic (or carbonaceous). The sawn edge shows...  Bulletin - Page 1131906Full view - About this book
 | Thomas Nelson Dale - Geographical positions - 1906 - 220 pages
...slightly graphitic (or carbonaceous). The sawn edge shows pyrite. It contains rare particles of magnetite, does not effervesce in cold dilute hydrochloric acid, and is very sonorous. Under the microscope the Fontaine quarry slate shows alternating bedlets of fine, more muscovitic, and coarser, more quartzose,... | |
 | Geological Survey (U.S.) - Geology - 1906 - 226 pages
...graphitic (or carbonaceous). The sa\vn edge shows pyrite. It dontains rare particles of magnetite, does not effervesce in cold dilute hydrochloric acid, and is very sonorous. Under the microscope the" Fontaine quarry slate shows alternating bedlets of fine, more muscovitic, and coarser, more quartzose,... | |
 | Thomas Leonard Watson - Jamestown Ter-centennial Exposition - 1907 - 1010 pages
...the slate from the Williams quarries, which may be taken as representative of the belt, as follows: "Under the microscope it shows a matrix of minute,...cleavage. The quartz fragments measure up to 0.085 millimeter. Scattered throughout both the more MINERAL RESOURCES OF VIRGINIA. PLATE VIII. Fig. 1. —... | |
 | Thomas Leonard Watson - Jamestown (Va.) - 1907 - 840 pages
...crystalline texture and very lustrous surface. According to Dale it is slightly graphitic and magnctitic, does not effervesce in cold dilute hydrochloric acid, and is very sonorous. Dale gives the constituents of the slate in order of their abundance as muscovite and sericitc, quartz,... | |
 | Geology - 1909 - 568 pages
...crystalline texture, and very lustrous surface. According to Dale, it is slightly graphitic and magnetitic, does not effervesce in cold dilute hydrochloric acid, and is very sonorous. Dale gives the constituents of the slate in order of their abundance as muscovite and sericite, quartz,... | |
 | Virginia. Division of Mineral Resources - Geology - 1909 - 166 pages
...crystalline texture, and very lustrous surface. According to Dale, it is slightly. graphitic and magnetitic, does not effervesce in cold dilute hydrochloric acid, and is very sonorous. Dale gives the constituents of the slate in order of their abundance as muscovite and sericite, quartz,... | |
 | Virginia. Division of Mineral Resources - Geology - 1913 - 736 pages
...lustrous cleavage surface. It is graphitic and usually slightly magnetitic, contains a little pyrite, does not effervesce in cold dilute hydrochloric acid, and is very sonorous. The degree of cleavability varies greatly in different parts of the area, but is usually high, so that... | |
 | Virginia. Division of Mineral Resources - Geology - 1913 - 816 pages
...lustrous cleavage surface. It is graphitic and usually slightly magnetitic, contains a little pyrite, does not effervesce in cold dilute hydrochloric acid, and is very sonorous. The degree of cleavability varies greatly in different parts of the area, but is usually high, so that... | |
 | Geological Survey (U.S.) - Geology - 1914 - 274 pages
...edge, does not effervesce in cold dilute hydrochloric acid, and is very sonorous and fairly fissile. Under the microscope it shows a matrix of minute alternating...cleavage. The quartz fragments measure up to 0.085 millimeter. Scattered throughout both the more micaceous and the more quartzose beds are crystals,... | |
 | Frank Lee Hess, Waldemar Theodore Schaller - Ferberite - 1914 - 810 pages
...slightly graphitic (or carbonaceous). The sawn edge shows pyrite. It contains rare particles of magnetite, does not effervesce in cold dilute hydrochloric acid, and is very sonorous. Under the microscope the slate of the Fontaine quarry shows alternating little beda of fine, more muscovitic, and coarser,... | |
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