valum
Valum refers to a specific type of volcanic rock. It is generally characterized by its fine-grained texture and often displays a dark coloration, typically ranging from black to dark gray. The composition of valum can vary, but it is commonly found to be a basaltic or andesitic rock, indicating a significant presence of minerals like plagioclase feldspar and pyroxene. This type of rock is formed from the rapid cooling of lava flows on the Earth's surface.
The term "valum" itself is not as universally recognized or strictly defined in geological literature as terms