tonstein

n. [地]白土石

发音

CA /ˈtʌnˌstaɪ̯n/
US /ˈtʌnˌstaɪ̯n/
UK /ˈtʌnˌstaɪ̯n/
SCOT /ˈtʌnˌstaɪ̯n/
CA /ˈtʌnˌstʌɪ̯n/
SCOT /ˈtʌnˌstʌi̯n/
SCOT /ˈtʌnˌstəi̯n/
AU /ˈtɐnˌstɑe̯n/
NZ /ˈtɐnˌstaɪ̯n/
IN /ˈʈənˌsʈajn/

词形变化

tonsteins 复数 tonsteins

释义与例句

n.
  1. 1.

    A hard, compact, kaolinite-rich claystone formed by the diagenetic alteration of volcanic ash, usually occurring as thin, laterally persistent layers interbedded with coal seams.

    可数 不可数 地质
  2. 2.

    Any indurated argillaceous rock that stands out within coal measures as a distinctive marker horizon.

    可数 不可数 地质

词源

Borrowed from German Tonstein, from Ton (“clay”) + Stein (“stone”).

来源：wiktionary