Report of the State Geologist on the Mineral Industries and Geology of Vermont, Band 7


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Seite 207 - Technical designation for a granite in which the percentages of soda-lime and of potash feldspar are nearly the same or in which the former exceeds the latter. In ordinary granites the amount of soda-lime feldspar is relatively small. RANDOM STONE. A term applied by quarrymen to quarried blocks of any dimensions. (See definition of dimension stone.) RIFT. A quarrymen's term to designate an obscure microscopic cleavage in granite which greatly facilitates quarrying. RUN. A term used by quarrymen in...
Seite 88 - ... the position of the beds in the Canton-Avon quadrangles. The Survey has received a number of requests for this information, and since wells are to be drilled, it would be wise to test first the areas which have one factor — namely, favorable geological structure, determined in advance of drilling. The field work upon which this report is based was done in 1914 as part of the regular program of the State Geological Survey in cooperation with (91) the United States Geological Survey.
Seite 206 - QUARRY. One in which the Joints are either so close or so Irregular that no very large blocks of stone can be quarried. CHANNEL. A narrow artificial incision across a mass of rock, which, in the case of a granite sheet, is made either by a series of contiguous drill holes or by blasting a series of holes arranged in zigzag order. CLEAVAGE, when applied to a mineral, designates a structure consequent upon the geometrical arrangement of its molecules at the time of its crystallization.
Seite 205 - Report on the Compressive Strength, Specific Gravity, and Ratio of Absorption of Various Kinds of Building Stones from Different Sections of the United States, Tested at Fort Tompkins, Staten Island, New York.
Seite 349 - ... a square being a sufficient number of pieces of slate of any size to cover 100 square feet of roof, with allowance generally for a 3-inch lap. The size of the pieces of slate making up a square ranges from 7 by 9 inches to 16 by 24 inches, and the number of pieces in a square ranges from 85 to 686, according to the size of the pieces. The ordinary thickness of a piece is from one-eighth to three-sixteenths of an inch, and the approximate weight per square is about 650 pounds. The slate is generally...
Seite 111 - ... biotite (black mica) some of it chloritized; and muscovite (white mica). Accessory minerals are very little magnetite, apatite, zircon, and rutile.
Seite 206 - ANTICLINE. A term applied to granite sheets or sedimentary beds that form an arch. APLITE. Fine-grained granite, usually occurring In dikes and containing little mica and a high percentage of silica. BASIC. A term applied to rocks in which the iron-magnesia minerals and feldspars with lime and soda predominate, such as diabase or basalts.
Seite 206 - GLOSSARY OF SCIENTIFIC AND QUARRY TERMS. ACCESSORY MINERALS in granite are original constituents of the rock, found only in small, often only in microscopic quantity. ACIDIC. A term applied to rocks in which silicic acid (silica) or quartz predominates.
Seite 206 - A microscopic granular structure sometimes characterizing adjacent feldspar particles in granite in consequence of their having been crushed together during or subsequent to their crystallization. CUT-OFF. Quarrymen's term for the direction along which the granite must be channeled...
Seite 207 - STRATIFIED. A term applied to rock consisting of originally horizontal beds or strata. STRIKE. The direction at right angles to the inclination of a plane of bedding, a sheet, or joint, etc. STRIPPING. The material (sand, clay, soil, etc.) overlying a rock of...

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