8/14/2023 0 Comments All types of obsidianBomb: a volcanic projectile with an average diameter greater than 64 mm and whose shape or surface indicates that it was partially or completely molten during its formation and transport through the air. ![]() Amygdaloidal: a volcanic rock containing mineral-filled cavities (or vesicles).Agglomerate: a rock of coarse pyroclastic material consisting dominantly of rounded fragments.They commonly display a spinifex texture consisting of intergrown skeletal and bladed olivine and pyroxene crystals in a glassy groundmass. Komatiite: these rocks are high in magnesium and crystallised at high temperatures.Trachyte: a volcanic rock composed largely of alkali feldspar.Latite: an intermediate volcanic rock with equal amounts of sodic plagioclase and alkali feldspar.Andesite: an intermediate, commonly porphyritic volcanic rock composed of plagioclase, pyroxene, hornblende and/or biotite. ![]() Composed of essential calcic plagioclase and pyroxene, sometimes with olivine, feldspathoids or interstitial quartz.
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