دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

a cryptocrystalline form of quartz with waxy luster.

n: a rock of precipitated silica whose crystalline structure is not easily discemible and that fractures conchoidally (like glass). Flint, jasper, and chat are forms of chert.

a hard, silicate sedimentary rock. Similar to flint, but with less ordered structure. A cryptocrystalline form of quartz.

crystal quartz gauge.

n: an igneous rock composed primarily of feldspar, quartz. and mica. It is the most common intrusive rock - that is, it originally solidified below the surface of the earth. Its rock crystals are easily seen by the eye.

common igneous rock. No effective permeability.

n: a sandstone that contains more than 15 percent silt and clay. and whose grains tend to be angular and poorly sorted.

a sandstone, characterized by angular-shaped grains of quartz and feldspar set in a matrix of fine grains. May have high hardness.

n: according to some mineral stiffness to decide the line.

a ten point scale of mineral hardness. The levels are keyed to the minerals: talc, gypsum, calcite, fluorite, apatite, orthoclase, quartz, topaz, corundum, and diamond.

abbr: quartz;used in drilling reports.

abbr: quartzite;used in drilling reports.

n: a hard mineral composed of silicon dioxide (silica),a common component in igneous, metamorphic, and sedimentary rocks.

SiO2 mineral with a variety of crystal shapes.