7
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I am quite attractive

I memorize things galore

Don't like ten (and a half)

And number twenty four

A host, water or air

Is all I need and care

Colourful I am

But dangerous, beware

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  • $\begingroup$ The three shades of blue =) $\endgroup$ – Alex Jul 20 '17 at 14:43
4
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Working from what @Apep got, as well as OP's hints ... are you perhaps

Rust (iron oxide)?

Like me or not I am everywhere. Can you guess?

Rust is found just about everywhere; some people like it (as a decorative patina, for example), while others don't.

I am quite attractive

I memorize things galore

I suspected from earlier answers that this one had to do with computers, but I had to look it up. According to Wikipedia, iron oxides are used in the production of magnetic storage media in computers - that is, computer memory. (So perhaps the "magnetic" part is what the "attractive" is referring to - as magnets attract things? Or maybe the line just means that rust itself is considered visually attractive by some people.)

Don't like ten (and a half)

And number twenty four

Chromium is element #24 on the periodic table; stainless steel contains a minimum of 10.5% chromium. Rust wouldn't like stainless steel as stainless steel is designed not to rust.

A host, water or air

Is all I need and care

In order to develop, all rust needs is an iron "host" (e.g. a nail) and water (found either in its liquid state, or as water vapor in the air).

Colourful I am

Rust has a lovely reddish color

But dangerous, beware

Rusty metal is known to cause tetanus, a dangerous disease; also, rust can cause iron structures (buildings, cars, bridges...) to weaken and even break!

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3
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Is it

Quartz ?

I am quite attractive

Quartz is shiny, bright and attractive

I memorize things galore

Quartz-clock based memory systems can store huge amounts of data

Don't like ten (and a half)

Ten is the normal starting time of work (on a working day) and a half represents 10:05 AM... which is quite not liked by many ?!

And number twenty four

In quartz-based clocks, all times can be represented except 24:00 hrs

A host, water or air

Can function anywhere (in a container / air / water )

Is all I need and care

However, it needs to be protected

Colourful I am

It exhibits all colours in certain form when normal white light gets incident on it

But dangerous, beware

It can be harmfult if swallowed / used in counter/timer-based explosive devices

And finally, when it comes to the title of the riddle,

quartz is everywhere (in the sand)

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  • $\begingroup$ Wouldn't ten-and-a-half on a clock be 10:30 instead of 10:05? $\endgroup$ – puzzledPig Jul 21 '17 at 13:38
  • $\begingroup$ @puzzledPig, well, the clue said about TEN and a half (1/2 of ten) which I have taken as 5 (and literally 05)... and proceeded. $\endgroup$ – Mea Culpa Nay Jul 21 '17 at 13:44
  • $\begingroup$ ok, I didn't think of that interpretation, but it could work too! :) $\endgroup$ – puzzledPig Jul 21 '17 at 13:49
1
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I think the answer is

Chromium

I am quite attractive

Chromium is used in jewellery.

I memorize things galore

Chromium is used in the magnetic storage layer of a hard disk drive.

Don't like ten (and a half)

Unsure about this one.

And number twenty four

Chromium is #24 on the periodic table of elements. (Hinted at by Deepak Mahulikar here.)

A host, water or air

Unsure about this one.

Is all I need and care

Unsure about this one.

Colourful I am

Chromium was named after the Greek word for colour because many compounds are intensely coloured.

But dangerous, beware

Chromium(VI) is toxic and carcinogenic.

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  • $\begingroup$ Boy you are on right track Apep. " dont like 24 and 10.5" Why wouldnt I like Chromium? 10.5 of it? $\endgroup$ – DEEM Jul 22 '17 at 21:28
  • $\begingroup$ Stainless steel has a minimum of 10.5% Chromium - might that be related? $\endgroup$ – puzzledPig Jul 23 '17 at 0:01
  • $\begingroup$ @puzzledPig That is most likely it, but it causes me to doubt my answer is correct. $\endgroup$ – Apep Jul 23 '17 at 0:20
0
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Is it

LASER !

I am quite attractive

Usually visual laser beam is attractive

I memorize things galore

Laser-based communication enables to transmit and store data(?!)

Don't like ten (and a half)

Ten is X (in Roman Numerals) and X-Rays have its own limitations as compared to LASER

And number twenty four

Maximum dimension (in units / measurements) of blades, beyond which it cannot penetrate, a kind of WILD guess !

A host, water or air

LASER can pass thorugh a host/water/air

Is all I need and care

We should be handling it with care

Colourful I am

LASER can occur in various colors

But dangerous, beware

It cane be harmful, if not handled properly !

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  • $\begingroup$ Or it could be U.V. Rays as well ! $\endgroup$ – Mea Culpa Nay Jul 20 '17 at 14:22
  • 1
    $\begingroup$ Good guess Mea Culpa but $\endgroup$ – DEEM Jul 20 '17 at 14:53
  • $\begingroup$ what about "(and a half)"? $\endgroup$ – shamalaia Jul 21 '17 at 8:52
  • $\begingroup$ Clue wise 24 is an important number and so is 10.5 $\endgroup$ – DEEM Jul 21 '17 at 12:52
0
$\begingroup$

Don't like ten (and a half)

And number twenty four

These could be referring to a 10.5 oz. can and a case of 24 cans maybe

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  • $\begingroup$ In what document full numbers show up??? $\endgroup$ – DEEM Jul 21 '17 at 18:09
  • $\begingroup$ I don't think I understand what you are asking $\endgroup$ – Grumpyllama59 Jul 21 '17 at 18:41
  • $\begingroup$ @DeepakMahulikar Full numbers are used in any formal writing. Not sure where you're headed with this. $\endgroup$ – feelinferrety Jul 21 '17 at 23:26
  • $\begingroup$ Just giving a clue. 24 shows up in what document or Table? $\endgroup$ – DEEM Jul 22 '17 at 11:15

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