tourmaline /toorˈmə-lēn/

A beautiful mineral of complex and varying composition, usu black (schorl) or blackish, strongly pyro-electric and pleochroic

• sight-singer
• sight-singers
• sight-singing
• sight-sings
• sightsman
• sightsmen
• sight-sung
• sight unseen
• sightworthy
• sigil
• sigillarian
• sigillarians
• sigillarid
• sigillarids
• sigillary
• sigillate
• sigillation
• sigillations
• sigils
• sigisbei
• sigisbeo
• sigla
• sigma
• sigma particles
• sigmas