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What do you mean "hydrothermal"?
What igneous rocks are porphyritic? | Socratic
Porphyry | geological feature | Britannica.com
Phenocryst & Porphyritic Textures - Science Trends
PPT - Porphyria PowerPoint Presentation, free download - ID:2122608
Fine-Grained Porphyritic Textures
Porphyry - Igneous Rocks
Porphyry - Igneous Rocks
Igneous Rock Textures