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File:Shoshonite lava flows on South Table Mountain, Colorado. Shoshonite is a type of igneous rock.More specifically, it is a potassium-rich variety of basaltic trachyandesite, [1] composed of olivine, augite and plagioclase phenocrysts in a groundmass with calcic plagioclase and sanidine and some dark-colored volcanic glass.
Fire rock is manufactured lava rock that is sold in various shapes and sizes, and is used as a medium for retaining direct heat. Fire rocks are used in natural gas fireplaces or in natural gas or propane burning fire pits. It may be used as the main fuel distributor or as padding for fire glass to go on top.
Pages in category "Lava rock buildings and structures" The following 24 pages are in this category, out of 24 total. This list may not reflect recent changes .
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If the parent rock is flow-foliated lava, sedimentary material or schistose metamorphic rocks, the blocks may have a plate-like or slab-like form. In other cases, blocks derived from great depths may resemble polished water-worn pebbles and are cobbled due to fluidisation and upwards transport.
More generally the classification of fine grained rocks recognises a group known as 'picritic rocks' that are characterised by high magnesium content and low SiO2 content. They fit in the TAS classification system only at the lowest level of Si02 (41 to 43% by weight) and Na2O + K2O (up to 3% by weight). They include picrite, komatiite and ...