(a.) Pertaining to, having the nature of, fire; containing fire; resembling fire; as, an igneous appearance.
(a.) Resulting from, or produced by, the action of fire; as, lavas and basalt are igneous rocks.
Example Sentences:
(1) The gamma-ray absorbed dose rates in air above igneous rocks generally vary with their silica contents, and with the exception of shale, sedimentary rocks have lower K:U and K:Th ratios than most igneous rocks.
(2) Igneous activity is especially characterised by oscillating conditions.
(3) It was concluded that Hungarian rock-soil systems, especially the acid igneous rocks and the widely distributed young sediments (loess and sand formations) with most of the agricultural activity, are low in Se, and the mean serum Se level of the blood samples were also low.
(4) The aluminosilicate minerals of igneous and metamorphic rocks are mostly unstable in earth-surface weathering conditions.
(5) Seen from above, the concentric rings of hills and valleys make a near perfect circle, with different rings composed of different types of igneous rock.
(6) These fungi were incubated with the following iron-containing minerals: augite, hornblende, biotite, magnetite, hematite, and the igneous rock granodiorite.
(7) Uranium-rich igneous rock is dissolved by groundwater that emerges to the surface in nine hot springs (which are used for bathing).
(8) The phosphorus was locked in an igneous lithosphere as orthophosphate.
(9) The primitive Earth was highly deficient in the total available phosphorus until a sufficient quantity of phosphorus weathered from the igneous rocks in which it was entrapped.
(10) A natural, igneous fluorapatite was found to be even more effective in nucleotide synthesis than the more soluble hydroxylapatite.
(11) With the advent of the first primitive rainstorms the slow endless process of liberating the phosphorus from the igneous rock strata had begun.
Porphyry
Definition:
(n.) A term used somewhat loosely to designate a rock consisting of a fine-grained base (usually feldspathic) through which crystals, as of feldspar or quartz, are disseminated. There are red, purple, and green varieties, which are highly esteemed as marbles.
Example Sentences:
(1) Sometimes fragments of the giant Reichschancellery, due to the recycling habits of East Germans, are seen: the walls and platforms of one U-Bahn station are inlaid with great lumps and plates of porphyry, fragments prised from the floors across whose glassy and obsessively waxed surfaces foreign dignitaries once had to pick their way into the Führer's presence.
(2) Histological changes caused by intratracheally introduced respirable mixed rock patterns (Porphyry, Enargite, Scarnic grained- and drill-cuttings) were examined and compared with standard DQ12 quartz samples 3, 6, 12 and 20 months after treatment.
(3) The biochemical diversity of the various porphyris often leads to incomplete investigation of photosensitive patients and porphyria may be excluded wrongly on the basis of normal urinary porphyrins alone.
(4) In spruce stands on quartz-porphyry sites raw humus is formed on strongly acid, calcium and phosphorus-deficient soils which were treated with lime, phosphate, and ammonium nitrate individually and in combined form.
(5) Next we are instructed to go to the Invalides and gaze down at Napoleon's Tomb, a squat mass of red porphyry which might have been more elegant had the British released the emperor's body from St Helena earlier in the 19th century.
(6) Due to the membrane-damaging effect of DQ 12 silica and mixed dusts (enargite and porphyry rock dusts) an increase in acid phosphatase activity of macrophages could be observed at the end of the first month.
(7) In the case of Porphyry rock patterns also storage type reaction developed.
(8) The influence of the nutrient status is clearly manifest in the humus form (raw humus in the case of quartz porphyry, mull-resembling moder in the case of basalt), but scarcely in the chemical and microbiological properties of the Of subhorizon.
(9) At this period, Afghanistan was the epicentre of classical globalisation: midway on the trade route from Rome to China, traders came to Afghanistan from all over the world, bringing painted glass from Antioch, inlaid gold vessels from Byzantium, porphyry from Upper Egypt, ivories from South India, carpets from Persia, horses from Mongolia and Siberia, and lacquers and silk from the China coast.