silex /sīˈleks/

1. Silica or quartz
2. A heat-resistant and shock-resistant glass formed of fused quartz

• chartless
• chartography
• Chartreuse
• chart-room
• charts
• chartulary
• charwoman
• charwomen
• chary
• Charybdian
• Charybdis
• char-à-banc
• chas
• chase
• chased
• chaseport
• chaseports
• chaser
• chase rainbows
• chasers
• chases
• chilli dogs
• chillier
• chillies
• chilliest