quartz
Concise Oxford English Dictionary © 2008 Oxford University Press:
quartz/kwɔːts/
▶noun a hard mineral consisting of silica, typically occurring as colourless or white hexagonal prisms.
– origin C18: from Ger. Quarz, from Polish dial. kwardy, corresp. to Czech tvrdý ‘hard’.
'quartz' also found in these Oxford entries:
agate
- amethyst
- aventurine
- cairngorm
- chalcedony
- cipolin
- citrine
- crystal
- dacite
- felsic
- Geissler tube
- granite
- granulite
- hornfels
- mica schist
- novaculite
- opal
- plasma
- prase
- quartz clock
- quartzite
- rock crystal
- rose quartz
- sandstone
- silex
- silica
- smokestone
- smoky quartz
- tiger's eye
- tonalite
- tridymite
