Silicates & Quartz
Pectolite
What it is
A sodium-calcium silicate typically found as white radiating crystal clusters. The stunning blue variety from the Dominican Republic is known as larimar — one of the rarest gemstones, found in only one location on Earth.
How it forms
Forms in cavities within volcanic basalt when hot sodium-calcium-rich fluids crystallize. Larimar's blue color comes from copper substituting for calcium.
NaCa₂Si₃O₈(OH)
