| 释义 |
itacolumite Min.|ɪtəˈkɒljuːmaɪt|
[f. Itacolumi, name of a mountain in Minas Geraes, Brazil + -ite.]
A granular, quartzose, talcomicaceous slate, sometimes flexible in thin slabs.
1862Dana Man. Geol. §88. 83 Itacolumite, a schistose quartz rock, consisting of quartz grains with talc or mica. 1868― Min. (ed. 5) 22 The diamond appears generally to occur in regions that afford a laminated granular quartz rock, called itacolumite, which pertains to the talcose series, and which in thin slabs is more or less flexible. 1878Lawrence tr. Cotta's Rocks Class. 240 In the Brazils itacolumite forms whole systems of strata of great thickness. |