Chalk

A soft rock (calcium carbonate) often white or light in colour, formed from shell fragments of minute sea organisms.
Definition source: Chambers 21st Century Dictionary

Català
guix
Deutsch
Kreide
Español
yeso
Italiano
gesso
Latviešu
krīts
Nederlands
krijt, kalk
Norsk
kalk
Português
giz
Română
cretă