Silica

Definition

silica /'sÇlÇkǝ/ n [U] ေက်ာက္၊ သဲ တို႔တြင္ေတြ႕ရေသာ ဆီလီကြန္ ျဒပ္ေပါင္း။ ဆီလီကာ။

Examples

1. ‘Glass is made from silica the most common mineral on the planet and aluminium is the most abundant metal on earth.’
2. ‘Chert is a finely crystalline silica that commonly forms in association with hot springs.’
3. ‘The engines of tomorrow's PCs may be based not on silicon dioxide but on exotic new compounds such as perovskite oxide or even the stuff of life itself
4. DNA.’
5. ‘Early in the 1800s
6. mineralogists recognized that tiger's-eye was a fibrous variety of quartz
7. or silicon dioxide.’
8. ‘Several powders or dry colours use a base of asbestos
9. chalk powder or silica.’
10. ‘The host limestone surrounding the pockets has been largely replaced by silica and iron oxides.’
11. ‘For some animals
12. developing hard shells of silica
13. or incorporating calcium in bones and teeth
14. has clear benefits.’
15. ‘The most common minerals are those that contain silicon dioxide in one form or another.’
16. ‘Sandy soil attached to the furs was the source of silica in the fur dust.’
17. ‘Soils are generally clay silica of varied depths and exposures.’
18. ‘Cristobalite is a crystalline form of silica that has a diamondlike structure.’
19. ‘In the fossilisation process
20. the original organic parts of the shark's tooth are replaced by minerals such as iron pyrites and silica.’
21. ‘The silicate minerals are those that contain silica
22. a combination of silicon and oxygen.’
23. ‘When serpentine dissolves in sulfuric acid
24. the silicon in the mineral becomes silicon dioxide
25. or sand
26. and falls to the bottom
27. while the magnesium becomes magnesium sulfate.’
28. ‘Precipitation of gold is favoured by similar conditions to those that favour precipitation of silica.’
29. ‘The silica and other minerals in the clay vitrify under heat and will not become soft clay again.’
30. ‘Quartz and sand are composed of silicon and oxygen alone: silicon dioxide
31. or silica.’
32. ‘Components such as transistors on microchips are made of inorganic materials
33. primarily silicon and silicon dioxide.’
34. ‘Silica aerogel is made by mixing silicon dioxide with liquid alcohol
35. then drying out all the alcohol until you have the least-dense matter on earth: A piece of silica aerogel is 99.6 per cent empty space.’
36. ‘Soluble silicates can be obtained by heating alkali metal carbonates and silica.’