Of a mineral: older than the rock or deposit of which it forms part (cf. allogenic, adj. 1). Contrasted with authigenic, adj.
| 单词 | θ7253 |
| 释义 | the world > the earth > minerals > types of mineral > [adjective] > other general types (2) allothigenic1888 Of a mineral: older than the rock or deposit of which it forms part (cf. allogenic, adj. 1). Contrasted with authigenic, adj. femic1902 Designating a primary category of igneous rocks whose chemical composition can be expressed in terms of a group of standard minerals which are… |
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