chalcedony

chalcedony — noun

1. a type of quartz stone with a soft, waxy shine, often pale blue, milky white, or

1.名詞C2
釋義

a type of quartz stone with a soft, waxy shine, often pale blue, milky white, or grey, and slightly see-through; used in jewellery and small carved objects.

例句

Jenna found a smooth blue chalcedony on the beach near her grandmother's house.

common collocation: smooth/polished + chalcedony

The museum displayed Roman seal rings carved from milky chalcedony and red carnelian.

noun: carved chalcedony in historical jewellery

同義詞
  • quartz

    broader category — chalcedony is one specific microcrystalline form of quartz

  • agate

    a banded, patterned variety of chalcedony

  • carnelian

    a reddish-orange variety of chalcedony

用法筆記

Almost always uncountable when describing the material; use 'a piece of chalcedony' rather than 'a chalcedony'. Countable only when referring to individual cut stones in a jewellery context.

常見錯誤

❌She bought three chalcedonies at the market.
✅She bought three pieces of chalcedony at the market.
💡chalcedony is a mass noun for the material; count it with 'piece(s) of' unless naming individual cut stones.