What events account for the cause of crystals end up as grains in sandstone?

Well i am mainly looking into zircon crystals which get formed when granite magma crystallises but which geological processes make them end up as grains in sandstones?
What events account for the cause of crystals end up as grains in sandstone?
http://www.backyardnature.net/g/processs...





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Reply:The granite cools and solidifies at depth within the earth's crust (incorporating the aforementioned zircon crystals and a whole lot else). Tectonic processes result in uplift and erosion, which eventually "unroofs" the granite and exposes it at the surface. If you are from the UK, think of the exposed granite tors on Dartmoor and in the Cairngorm Mountains. Erosion, over long periods of time, wears down the granite, and the sand grains are transported via rivers out to sea where they are re-deposited as sand layers under marine conditions. The sands will contain all sorts of minerals including quartz, feldspars, micas, all of which can be derived from granite. The zircons are particularly resistant to erosion and can be transported for long distances, ending up as grains within sandstones many hundreds of miles away from their source.