sideriticadj.
/ˌsʌɪdəˈrɪtɪk/, /ˌsɪdəˈrɪtɪk/, U.S. /ˌsɪdəˈrɪdɪk/, /ˌsaɪdəˈrɪdɪk/ Geology and Mineralogy.
Of the nature of or containing siderite (siderite n.1: formerly in senses 3, 5; now in sense 6).
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the world > the earth > minerals > types of mineral > phosphates > [adjective] > phosphate of iron
sideritic1796
1796 R. Kirwan Elements Mineral. (ed. 2) II. 180 Sideritic Calx. This consists of Calx of Iron united to Phosphoric acid.
1811 J. Pinkerton Petralogy I. 8 As the stones, confessedly called basalts by the ancients, often present marks of crystallisation, being sideritic rocks or primitive traps.
1954 J. F. Kirkaldy Gen. Princ. Geol. xviii. 273 At Banbury in Oxfordshire and in the Cleveland Hills of Yorkshire, there are beds of sideritic iron ore.
2008 Constr. & Building Materials 22 1447/2 In the Whitby area the junction between the Middle and Lower Jurassic is marked by the Dogger of the Lower Bajocian (sideritic sandstone).
This entry has been updated (OED Third Edition, March 2016; most recently modified version published online March 2022).
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adj.1796