What's the difference between glass and obsidian?

Glass


Definition:

  • (v. t.) A hard, brittle, translucent, and commonly transparent substance, white or colored, having a conchoidal fracture, and made by fusing together sand or silica with lime, potash, soda, or lead oxide. It is used for window panes and mirrors, for articles of table and culinary use, for lenses, and various articles of ornament.
  • (v. t.) Any substance having a peculiar glassy appearance, and a conchoidal fracture, and usually produced by fusion.
  • (v. t.) Anything made of glass.
  • (v. t.) A looking-glass; a mirror.
  • (v. t.) A vessel filled with running sand for measuring time; an hourglass; and hence, the time in which such a vessel is exhausted of its sand.
  • (v. t.) A drinking vessel; a tumbler; a goblet; hence, the contents of such a vessel; especially; spirituous liquors; as, he took a glass at dinner.
  • (v. t.) An optical glass; a lens; a spyglass; -- in the plural, spectacles; as, a pair of glasses; he wears glasses.
  • (v. t.) A weatherglass; a barometer.
  • (v. t.) To reflect, as in a mirror; to mirror; -- used reflexively.
  • (v. t.) To case in glass.
  • (v. t.) To cover or furnish with glass; to glaze.
  • (v. t.) To smooth or polish anything, as leater, by rubbing it with a glass burnisher.

Example Sentences:

  • (1) The previous year, he claimed £1,415 for two new sofas, made two separate claims of £230 and £108 for new bed linen, charged £86 for a new kettle and kitchen utensils and made two separate claims, of £65 and £186, for replacement glasses and crockery.
  • (2) Human gingival fibroblasts were allowed to attach and spread on bio-glasses for 1-72 h. Unreactive silica glass and cell culture polystyrene served as controls.
  • (3) Retention of platelets from whole blood on glass beads was performed by the method of Bowie.
  • (4) Populations of lymphocytes were separated using glass and nylon wool.
  • (5) Analysis of bond values of glass ionomer added to glass ionomer indicate bond variability and low cohesive bond strength of the material.
  • (6) It was like watching somebody pouring a blue liquid into a glass, it just began filling up.
  • (7) A reference glass, five ceramic materials, and one resin-based composite were tested.
  • (8) The average repetitive yields and initial coupling of proteins spotted or blotted into PVDF membranes ranged between 84-98% and 30-108% respectively, and were comparable with the yields measured for proteins spotted onto Polybrene-coated glass fiber discs.
  • (9) Samples of rockwool and glass fibre were compared with chrysotile fibres for their capacity to hydroxylate 2-deoxyguanosine to 8-hydroxydeoxyguanosine, a reaction that is mediated by formation of hydroxyl radicals.
  • (10) Perfused or immersion-fixed epithalamic tissues, sectioned, and mounted on glass slides were processed through the avidin-biotin immunofluorescence method.
  • (11) Nango's dwellings are built on skis so can be pulled around the beach, and have a glass roof to view the northern lights.
  • (12) His office - with a floor-to-ceiling glass wall offering views over a Bradford suburb and distant moors - is devoid of knick-knacks or memorabilia.
  • (13) Three brands of glass ionomer were applied to prepared dentin surfaces of extracted human molars, after one of four treatments with polyacrylic acid.
  • (14) At the bottom is a tiny harbour where cafe Itxas Etxea – bare brick walls and wraparound glass windows – is serving txakoli, the local white wine.
  • (15) When Vladimir Putin kicks back on New Year's Eve with a glass of Russian-made champagne, and reflects on the year behind him, he is likely to feel rather pleased with himself at the way his foreign policy initiatives have gone in 2013.
  • (16) When used in snail neurones such electrodes gave very similar pHi values to those recorded simultaneously by recessed-tip glass micro-electrodes.
  • (17) Cells dissociated from 6-day rat cerebellum were seeded on glass coverslips coated with polylysine on one half and hyaluronectin on the other.
  • (18) These results confirmed that 'punctuated' labeling was not an artefact due to a distortion of the cell's shape by having been dried on glass slides.
  • (19) At one, in the Gun and Dog pub in Leeds on Tuesday, a witness described how the meeting descended into chaos when one of the rebels smashed a glass and threatened to attack Griffin supporter Mark Collett.
  • (20) Dissociated culture of adult mouse dorsal root ganglion cells on glass plates, on which grating-associated microstructures (a repetition of microgrooves [mGRV] and microsteps [mSTP] of 0.1-10 micron) are fabricated by the conventional lithographic techniques, represents a remarkable bi-directional growth of their nerve fibers in the axial direction of the grating.

Obsidian


Definition:

  • (n.) A kind of glass produced by volcanoes. It is usually of a black color, and opaque, except in thin splinters.

Example Sentences:

  • (1) ‘The job is fun, but should never be more than 40 hours per week’ Veteran game designer Chris Avellone, now co-owner of Obsidian Entertainment, focuses on downscaling.
  • (2) In Mesoamerica, the Aztec empire promoted a militaristic state ideology and developed extensive trade networks to secure valued materials, including obsidian and exotic and symbolically powerful materials such as the shimmering, iridescent feathers of the quetzal bird.
  • (3) The victims are splayed on a column at the top of a pyramid, and a priest cracks their ribcage open with an obsidian knife to pluck out their still-beating hearts.
  • (4) A method for analysis of Ni concentrations in tissues is described, which involves (a) tissue dissection with metal-free obsidian knives, (b) tissue homogenization in polyethylene bags by use of a "Stomacher" blender, (c) oxidative digestion with mixed nitric, sulfuric, and perchloric acids, and (d) quantitation of Ni by electrothermal atomic absorption spectrophotometry with Zeeman background correction.
  • (5) It will come in three colours: black, grey and obsidian and goes on sale in 2018.
  • (6) It’s a fun job, but it shouldn’t be an exploitative one Chris Avellone, Obsidian Entertainment The need to appease both parties can lead to blow-outs.

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