Check out this link about crystal formation: Theory of Crystal Formation
Adam - are you joking?
How Quartz is created
Quartz is a defining constituent of granite and other felsic igneous rocks. It is very common in sedimentary rocks such as sandstone and shale. It is a common constituent of schist, gneiss, quartzite and other metamorphic rocks. Quartz has the lowest potential for weathering in the Goldich dissolution series and consequently it is very common as a residual mineral in stream sediments and residual soils.
While the majority of quartz crystallizes from molten magma, much quartz also chemically precipitates from hot hydrothermal veins as gangue, sometimes with ore minerals like gold, silver and copper. Large crystals of quartz are found in magmatic pegmatites. Well-formed crystals may reach several meters in length and weigh hundreds of kilograms.
That's how you make quartz crystals...and oh, yeah, you have to wait several millennia for them to get big.
A GCSE or equivilent text book from a local library should clear this up. Even better, one of my favourate books called the "Crystal Bible" has a thorough introduction to how crystals form and grow.
That said; no, buried crystals won't grow.
"That said; no, buried crystals won't grow."
But they will get dirty, which serves no useful purpose.
crystals can grow, it just depends. some people grow different kinds of crystals pretty much from scratch. the details involved in a crystal growing determine whether it will grow or not.