siderite (noun)
1
(uncountable, mineralogy) a widespread brown mineral, FeCO3, having the structure of calcite
2
(countable) an iron meteorite
3
An indigo-blue variety of quartz.
(uncountable, mineralogy) a widespread brown mineral, FeCO3, having the structure of calcite
(countable) an iron meteorite
An indigo-blue variety of quartz.