Itz is fundamentally related to another substance called ch'ul. Both substances are magical and holy stuff.
The above is a quote from Al Freidel - Maya Cosmos'. I got this info from the documentary Stargate 2012 by William Henry, 1:00:37 mark.
now that we got the legal stuff out of the way, from what I understand is that Itz is a substance that comes from space every 13000 years. This stuff
is energy that is shot out during a starburst.
He shows evidence from various civilizations that had documented these events through religious symbols, Egyptians, Mayans, Jews, Japanese, Greek,
others. He claims this knowledge was passed down from different people and the people who received these substance (Itz) became Ch'ul (enlightened)
such as Jesus and other important religious figures.
He also shows how our language also reflects what they meant , ie. 'the IT factor, they have IT, they're Chul. It's a very interesting doc. I'd
be happy to share.