Limestone - the sacred stone of the ancients

The Giza pyramids are made largely from limestone (although the King's chamber is made of rose granite).

The Mayan pyramids are made of limestone and sits on the Yucatan peninsular which is a limestone shelf.

The Incan Manchu Picchu is made of limestone.

Coral Castle in Florida is made of limestone.

Coincidence? I think not. Incidentally, these buildings all contain huge stones weighing 10's of tons that nobody has any idea how they were lifted. Rumors are that they are lifted by anti-gravity. Maybe if you want to float a stone, limestone is the key.

Incidentally, calcium carbonate crystals (the main mineral in limestone) are known to be piezoelectric (that is a voltage is produced as a result of vibrations) and are found in the pineal gland. Biologically, the pineal gland is known to "produces the serotonin derivative melatonin, a hormone that affects the modulation of wake/sleep patterns and seasonal functions." (Wikipedia) Esoterically, the pineal gland is the 3rd-eye chakra, the doorway to astral travel, hidden knowledge and higher consciousness. The pyramids are known to be temples for initiation and activation of higher consciousness. Another coincidence?

What is the secret of calcium carbonate? I really want to find out...