| NOUN | substance | groundmass | (geology) the matrix of fine-grained crystalline material in which larger / larger crystals are embedded |
|---|
| Meaning | (geology) the matrix of fine-grained crystalline material in which larger / larger crystals are embedded. | |
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| Category | geology | A science that deals with the history of the earth as recorded in rocks / rocks |
| Broader | igneous rock | rock formed by the solidification of molten magma |
| Substance of | porphyry, porphyritic rock | Any igneous rock with crystals embedded in a finer groundmass of minerals |
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