Ambiguous igneous rocks.
Reynolds
Owen
O
D003880:Dermatology; D055593:Geological Phenomena; D005844:Geology; D006801:Humans; D008010:Lichen Planus / Q000175:diagnosis; D019365:Metaphor; D008903:Minerals; D017640:Silicates; D012822:Silicon Dioxide; D009626:Terminology as Topic
D008903:Minerals; D017640:Silicates; C060346:basalt; C007886:granite; D012822:Silicon Dioxide