ironstone词源

英文词源

siderite

"A brown mineral consisting of ferrous carbonate, occurring as the main component of some kinds of ironstone or as rhombohedral crystals in mineral veins", Late 16th century (denoting lodestone): from Greek sidēros 'iron' + -ite¹.

septarium

"A concretionary nodule, typically of ironstone, having radial cracks filled with calcite or another mineral", Late 18th century: modern Latin, from Latin septum 'enclosure'.