Min. [f. SPHÆRO- + SIDERITE1.] ‘A variety of siderite occurring in spherical concretions’ (Chester).
1837. Dana, Min., 213. Carbonate of Iron. Sparry Iron…. Sphærosiderite.
1878. Lawrence, trans. Cotta’s Rocks Class., 50. In the compact state, or when occurring in reniform masses or concretions, this mineral is termed sphærosiderite.
1886. Geikie, Class-bk. Geol., 181. Sphærosiderite or Clay-ironstone concretion enclosing portion of a fern.
