دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

siliceous rock with alternating bands of chalcedony and colored chert.

a sediment with alternating layers of chert and iron rich minerals.

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.

n: The regulate that paying not by footage but per diem due to the hardness of flint in drilling contract.

a variety of chert.

n: A carbonate sedimentary rock predominantly composed of calcite of organic, chemical or detrital origin. Minor amounts of dolomite, chert and clay are common in limestones. Chalk is a form of fine-grained limestone.

n: a mineral that has the chemical formula SiO2 (silicon dioxide). It is relatively hard and insoluble. Quartz is a form of silica, but usually contains impurities that give it color.

n: A chemically resistant dioxide of silicon that occurs in crystalline (quartz),amorphous (opal) and cryptocrystalline (chert) forms.