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The terms lava stone and lava rock are more used by marketers than geologists, who would likely say "volcanic rock" (because lava is a molten liquid and rock is solid). "Lava stone" may describe anything from a friable silicic pumice to solid mafic flow basalt, and is sometimes used to describe rocks that were never lava, but look as if they ...
Flaked stone artefacts from Australia, made of tachylite. A second mode of occurrence of tachylite is in the form of lava flows.Basaltic rocks often contain a small amount of glassy ground-mass, and in the limburgites this becomes more important and conspicuous, but vitreous types are far less common in these than in the acid lavas.
The lava flows formed the conditions for the creation of Lake Superior agates. As the lava solidified, water vapor and carbon dioxide trapped within the solidified flows formed a vesicular texture (literally millions of small bubbles). Later, groundwater transported ferric iron, silica, and other dissolved minerals passed through the trapped ...
Rivers of lava spewed from a fissure in the mountainside, snaking downwards and erupting in fountains of red and gold molten rock when the Fagradalsfjall volcano erupted this week in a fishing ...
Most of the lava continued to flow westward through Klastline Valley and reached the Stikine River. [121] [131] Lava flows overlying sediment at the mouth of the Tahltan River. Lava of the Klastline eruptive period continued to flow 55 kilometres (34 miles) downstream along the Stikine River from its confluence with the Klastline River. [142]
Basaltic lava rock with holes where bubbles of gas were trapped within the lava when it was molten, from Lanzarote (length: 6 cm (2.4 in)) In the Canary Islands, igneous rocks of the alkaline magma series are common, while rocks of the sub-alkaline tholeiitic magma series are rare. [25]