Silica are varieties, how many type the silica have?!

The silica varieties an really important constituent of pretty much all rock-forming minerals. it is present in the variety of forms, as quartz crystals, huge forming hills, quartz sand (silica sand), sandstone, quartzite, tripoli, diatomite, flint, opal, chalcedonic varieties like agate, onyx etc., as well as in with several other varieties reliant upon color these kinds of as purple quartz (amethyst), smoky quartz, yellow-colored quartz or false topaz (citrine), went up by quartz and milky quartz.
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There's just one variety of the element silicon. I guess you mean chemical compounds that contain silicon. Yes, silicon dioxide (silica) is one of them and it's one of the most abundant minerals on Earth. I don't know how many compounds you can make out of silicon but it has many uses. It could probably replace rubber.

And it's best to put this in the Chemistry category.