Sindarin 

glast

noun. marble

Cognates

  • ᴺQ. alas “marble”

Derivations

  • ᴺ✶. galast- “marble, (orig.) thing pleasant to touch”
    • ᴹ√GALAS “joy, be glad”
    • ᴹ√GAL “grow, thrive” ✧ Ety/GALA

Element in

  • ᴺS. glathren “[of or like] marble”