New York City built on 542 million year old natural crystal

The underlying bedrock formation on Manhattan Island is called the Manhattan Schist which consists of:

    “… very massive rusty to sometimes maroon-weathering, medium to coarse-textured, biotite-muscovite-plagioclase-quartz-garnet-kyanite-sillimanite gneiss and, to a lesser degree, schist. The presence of kyanite, sillimanite, quartz and magnetite layers and lenses up to 10 cm thick, cm- to m-scale layers of blackish amphibolite, and scarce quartzose granofels. A result of its durability to weathering is due to the lack of layering and presence of wear-resistant garnet, kyanite, and sillimanite.”

Interesting article about how
"Interesting to contemplate that one possibly far-fetched but not totally improbable idea is that New York in particular became the “epicenter of communication” it is today because of this naturally occurring rich lattice work of crystalline rock. Crystals naturally cut into perfect sheets lined up and a piezoelectric effect caused by fault lines and cracks through Manhattan Island transmitting a super amplification of the code within “the field” matrix."
 

Article here: Examiner.com