(n.) A rock of igneous origin, consisting of augite and triclinic feldspar, with grains of magnetic or titanic iron, and also bottle-green particles of olivine frequently disseminated.
(n.) An imitation, in pottery, of natural basalt; a kind of black porcelain.
Example Sentences:
(1) Photograph: Alamy The Devils Postpile, near Mammoth Lakes on the east side of Yosemite, looks as if it might have been created by some satanic sculptor, but really it's just one of the world's best examples of columnar basalt, a similar geological feature to the Giants Causeway in Northern Ireland.
(2) The aerial shots along the route – taking in the crenellated ruins of Dunluce Castle, the vertiginous Carrick-a-Rede rope bridge, the basalt stacks of the Giant's Causeway, and the seaside villages of Ballycastle, Cushendun, Cushendall and Carnlough – will be a pleasant surprise for viewers who have an entirely different image of Northern Ireland.
(3) Dotted across 2,000 square kilometres of hills and villages on a basalt plateau in western India sit more than 800 turbines - generating more than 1,000 megawatts of electricity.
(4) The second half of our ride was 118km back down to Belfast, but we optimistically took a detour from the Giro route to marvel at something the peloton won't get to see – the Giant's Causeway, one of the world's natural wonders, with its thousands of perfectly-formed, hexagonal basalt columns stretching out along the coast.
(5) These plants produce basalt wool, sag wool and glass fibres used in industrial and building insulating materials and in cement and mortar additives and as a free insulating material.
(6) In the sedimentary rock areas calcium and magnesium concentrations were high; the magnesium-to-calcium ratio in these areas was between those of the basalt and granite areas.
(7) For the Azores you pack a cagoule and sunglasses, your swimming gear and walking shoes, for you’re never more than a few minutes from a dramatic basalt seashore or an alluring grassy pathway.
(8) In order to eliminate asbestos adverse effect on workers' health it was necessary to use mineral rayon, primarily basalt fibre, instead of asbestos.
(9) Josiah also created Black Basalt, a fine black porcelain, which enabled him to produce copies of the newly excavated Etruscan pottery from Italy.
(10) There was no credible data on the differences between the groups exposed to various types of basalt fibre.
(11) It's unlikely I'd have developed a lifelong addiction to live music had I not seen Blur tearing the roof off a Midlands bog venue in 1991, nor ever taken Arctic Monkeys seriously if I hadn't witnessed Birmingham's Carling Bar Academy try to bounce itself into the basaltic layer in 2005.
(12) • Pinnacles links condors recovery programme , climbing , camping , caves Devils Postpile national monument Basalt columns at Mammoth Lake, Devil's Postpile national monument.
(13) It was in England that Sigurdsson would really bloom, becoming in the process a frontiersman for the great Icelandic experiment, that frankly quite bonkers investment in youth football enacted around the turn of the millennium by this spiky lump of mid-Atlantic basalt, and expressed most fully in the minor miracle of Euro 2016 qualification .
(14) The Postpile's 18m columns were created when a mass of basaltic lava cooled at a relatively uniform rate.
(15) The same observation was valid, when the asbestos exposed group was compared with the groups exposed to asbestos substitutes (basalt and glass fibres).
(16) Basalt (Kilauea-lki) and chondrite (Orgueil) have been found to behave similarly.
(17) Endemic elephantiasis of the lower legs in Ethiopia, which reaches a maximum of 86-7 per 1,000 adults in affected areas, is related to the distribution of red clay soil derived from volcanic rocks, particularly basalt.
(18) 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.
(19) The park is named after the Siete Tazas (seven cups), a series of pools in a narrow gorge that were carved out of black basalt rock by the Claro river.
(20) The occurrence at high altitude (over 1,200 metres) is noted and the predominance of basalt or basalt-like lava in each case is considered significant.
Pumice
Definition:
(n.) A very light porous volcanic scoria, usually of a gray color, the pores of which are capillary and parallel, giving it a fibrous structure. It is supposed to be produced by the disengagement of watery vapor without liquid or plastic lava. It is much used, esp. in the form of powder, for smoothing and polishing. Called also pumice stone.
Example Sentences:
(1) A new method, not previously recommended, involving the use of a green rubber wheel followed by pumice or composite finishing paste was similarly examined and found to come closest to restoring the original, natural enamel surface.
(2) Radiograms of the cranium show a "pumice-stone" appearance of the dome and deformation of the sella turcica.
(3) This layer can be removed by thorough pumicing or by grinding.
(4) Also, fewer bacteria were recovered from vigorously-pumiced, molar-tooth surfaces 24 h after application of albumin compared to buffer-treated controls.
(5) Ragwheels and pumice samples were collected and cultured, the results of which mandate the need for infection control guidelines for the dental laboratory.
(6) Scanning electron micrographs, surface profile tracings, surface roughness recordings, and statistical analysis of data support the finding that the best surface finish is obtained when sandblasting, hard stone, medium abrasive disk, second sandblasting, electropolishing, hard rubber point, hard felt disk with pumice slurry, and felt disk and soft brush with polishing paste are used progressively.
(7) Finishing was done with wet pumice and cup, wet pumice and a brush, a grit rubber polishing point, and an aluminum oxide- coated disc.
(8) Method I consisted of green stone, followed in sequence by finishing bur and pastes of pumice, powdered chalk, and SnO2.
(9) Various abrasive materials, such as pumice, polyethylene, and aluminum oxide are widely used as adjuncts in the therapy of acne.
(10) Pumice and air-powder polishing gave a similar reduction of the sonic scaling roughness.
(11) The occlusal surface was (1) air polished for 20 seconds, (2) cleaned with pumice for 20 seconds, or (3) not cleaned.
(12) All patients received a subgingival scaling and pumice by a hygienist every 6 months.
(13) Test teeth were cleaned with pumice and 10% alcohol, air-dried, and insulated at the approximal surfaces with strips of rubber dam.
(14) Thus, pumicing is a necessary final step with all removal procedures studied.
(15) The mean CO2 output during anaesthesia in paralyzed patients can be monitored by continuous capnographic analysis of the total exhaled gases, the latter being mechanically integrated by pumice canisters.
(16) Food particles (wheat flour, fishmeal or yeast) were ingested approximately 3 times faster than inert particles (kaolin, pumice or synthetic cellulose).
(17) However, when the surface of the etched enamel was pumiced, the enamel reacquired both the shine and appearance of non-etched enamel.
(18) Samples of used dental laboratory pumice from the two dental laboratories were cultured for the isolation of fungi.
(19) A flat enamel surface was obtained with 600-grit silicon carbide paper and cleaned with a rubber cup and a water slurry of fine flour of pumice.
(20) The rubbing application of a hydrochloric acid-pumice mixture has been advocated for the removal of fluorotic-like areas of permanent teeth.