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What's the difference between sand and quartz? Is quartz more crystalline form of sand? Do they have the same composition or my be not? or my be the two words is similar? Do they contain more than silica? Thanks.

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closed as off-topic by Todd Minehardt, jonsca Sep 16 '16 at 0:46

This question appears to be off-topic. The users who voted to close gave this specific reason:

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    $\begingroup$ I'm voting to close this question as off-topic because the answer is very easily Googled. $\endgroup$ – Todd Minehardt Sep 15 '16 at 23:35
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    $\begingroup$ atleast you gave a reason for the thumbs down, I h8 it when they dont give a reason. $\endgroup$ – eromod Sep 15 '16 at 23:40
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  1. Sand is a poorly-defined mixture, not a necessarily a pure substance. Some sands are fairly pure $\ce{SiO2}$, the same chemical formula as pure quartz, but in some areas of the world, sand can be made of entirely different chemicals, such as calcite.

  2. Quartz is a particular crystal form of $\ce{SiO2}$, but $\ce{SiO2}$ also forms the minerals tridymite, cristobalite, coesite, and stishovite, amorphous silica, etc. It's like having a collection of Legos or TinkerToys that have the same pieces, but can be assembled in different formats.

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  • $\begingroup$ Thanks a lot for the informative explanation, so quartz is only one compound (silica) and sand contain more than one compound not only silica $\endgroup$ – studentrr Sep 16 '16 at 0:07
  • $\begingroup$ Possibly... some sands are reasonably pure SiO2, others are fairly random mixtures. $\endgroup$ – DrMoishe Pippik Sep 16 '16 at 0:32
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quote from wikipedia

The composition of sand varies, depending on the local rock sources and conditions, but the most common constituent of sand in inland continental settings and non-tropical coastal settings is silica (silicon dioxide, or SiO2), usually in the form of quartz.

Sand is a heterogeneous mixture

Quartz is compound

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  • $\begingroup$ You might want to expand on this - it's a borderline HW question and your answer should at least include the relevant text from the Wikipedia entry for quartz (and not just the one for sand). $\endgroup$ – Todd Minehardt Sep 15 '16 at 23:37
  • $\begingroup$ I think you can do a better job, shall you? $\endgroup$ – eromod Sep 15 '16 at 23:38
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    $\begingroup$ I can certainly spell better - editing your answer now. $\endgroup$ – Todd Minehardt Sep 15 '16 at 23:39
  • $\begingroup$ you converted my ego into a heterogeneous mixture $\endgroup$ – eromod Sep 15 '16 at 23:42

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