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- Lava containing less than 50 percent silica.
Source: Leet, L. Don. 1982. Physical Geology, 6th Edition. Englewood Cliffs, NJ: Prentice-Hall
- Lava poor in silica, generally less than 52% total SiO2 ; typically dark and heavy, as basalt.
Source: Dictionary of Mining, Mineral, and Related Terms