Insights into the structure and morphogenesis of the giant basal spicule of the glass sponge Monorhaphis chuni

Table 1 The ranges of ²⁹Si chemical shifts in solid silicates, derived from [55]

Type of silicates	Q_n species	Range of chemical shift (ppm)
Monosilicates	Q₀	− 66 to − 74
Disilicates and chain end groups	Q₁	− 75 to − 82
Chain middle groups	Q₂	− 85 to − 89
Chain branching sites	Q₃	− 95 to − 100
Three-dimensional framework	Q₄	− 103 to − 115

ISSN: 1742-9994