Assertion: obsidian's composition | /r/HasProperty | complex to comprise a single mineral
Facets:
Source sentences:
text: Because crystals cannot form in this situation, the lava cools into a volcanic glass containing no crystals!Obsidian is mineral-like, but not a true mineral because as a glass it is not crystalline; in addition, its composition is too complex to comprise a single mineral.
text: Because crystals cannot form in this situation, the lava cools into a volcanic glass containing no crystals!Obsidian is mineral-like, but not a true mineral because as a glass it is not crystalline; in addition, its composition is too complex to comprise a single mineral.