The weight one stone in Stonehenge has been presumed to be between 20-25 tons each stone and if you need more information it was built between 8000 and 1500 B.C. the Stonehenge itself was originally began around 8000 B.C. but the main construction was around 3000-2000 B.C.
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you can find many different stones and much, much, more
Giant stones (e.g. the Stonehenge stones) from prehistoric times.
The major stones of Stonehenge are mostly sandstone, others are igneous rocks.
Yes.
There are several theories. see http://en.wikipedia.org/wiki/Stonehenge#Stonehenge_3_I_.28ca._2600_BC.29