A bitter  mineral 

Components

Meaning component
chǎng cliff, (roof)
Meaning component
xīn laborious

Character Evolution

Seal form
Seal Western Han 202 BC-9 AD
Seal form
Seal Shuowen ~100 AD
Regular Modern

Historical Pronunciations

Old Chinese
Zhengzhangl'iːl

說文解字

唐厗,石也。从厂,屖省聲。

Sources

Readings & variants
Unicode
Historical pronunciations
Zhengzhang Shangfang
Historical images
Academia Sinica