Gottfried Leibniz was born on July 1 [OS: June 21], 1646, in Leipzig, Saxony, to Friedrich Leibniz (1597–1652) and Catharina Schmuck (1621–1664).
Tectosilicates, or “framework silicates,” have a three-dimensional framework of silicate tetrahedra with SiO2 in a 1:2 ratio. This group comprises nearly 75% of the crust of the Earth.