. Bulletin of the Geological Society of America. Geology. 434 V. F. MARSTERS—ASBESTOS DEPOSITS OF BELVIDERE MOUNTAIN to indicate that a zone of fracture with marked shearing crosses the prop- erty of the New England company. It is probable, too, that a smaller one crosses the property of the National company. A third belt of frac- ture with minimum shearing occurs on the property of Judge Tucker. This case is adjacent to the igneous contact to be discussed in another section. The fiber is largely of the " cross-fiber " type. It has the color and luster of true chrysotile. Under the b
. Bulletin of the Geological Society of America. Geology. 434 V. F. MARSTERS—ASBESTOS DEPOSITS OF BELVIDERE MOUNTAIN to indicate that a zone of fracture with marked shearing crosses the prop- erty of the New England company. It is probable, too, that a smaller one crosses the property of the National company. A third belt of frac- ture with minimum shearing occurs on the property of Judge Tucker. This case is adjacent to the igneous contact to be discussed in another section. The fiber is largely of the " cross-fiber " type. It has the color and luster of true chrysotile. Under the blowpipe it behaves in all respects like the fibrous form of chrysotile. It yields considerable water and is nearly infusible. There is a tendency on continuous appli- cation of the flame for very fine films or strands of the fiber to become noticeably brittle. The cross-fiber was, however, quite uniform in its behavior before the blowpipe. Still one or two samples did not yield as much water as should be expected in true chrysotile. How preva- lent this may be has not been determined. The " slip-fiber " differs from the " cross-fiber " in having a duller and waxy luster, less flexibility, and a tendency to develop a coarser but longer strand, sometimes reaching 3 inches in length, while the latter rarely attains 1 inch in length. Under blowpipe tests the slip-fiber yields much less water and fuses, with some difficulty, to a white enamel. The color test for calcium was also evident. These reactions strongly suggest that the slip-fiber is not true chrysotile, but a fibrous form of amphibole. This variety, however, is on the market as asbestos, but its market values are much less and its uses not so great in Figure 3.—Cross-section of a Slip-block. Showing the minute fiber veins in a position where the block would be subjected to the greatest strain, and hence offer the best lines along which the fiber might develop. At the lower contact of the ser
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