英语词源字典 - 在线词源网站

siderite [siderite 词源字典]: "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.[siderite etymology, siderite origin, 英语词源]
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'.