From Treasures of Darkness:
"Solomon had ordered that no hammers, axes or chisels should be used to cut and dress the many massive stone blocks from which the outer walls and courtyard of the Temple had been built. Instead he had provided the artificers with an ancient device, dating back to the time of Moses himself. This device was called the shamir and was capable of cutting the toughest of materials without friction or heat."
And an interesting essay that posits the true nature of the shamir: a radiactive substance, possibly radium, that lost its radioactivity in the 400+ years between the building of the Temple and its destruction at the hands of Nebuchadnezzar. (The author is Immanuel Velikovsky, whose Ages in Chaos is being republished this month.)