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The unicorn throne in Denmark.. A unicorn horn, also known as an alicorn, [1] is a legendary object whose reality was accepted in Europe and Asia from the earliest recorded times.
Pumice is composed of highly microvesicular glass pyroclastic with very thin, translucent bubble walls of extrusive igneous rock.It is commonly [4] but not exclusively of silicic or felsic to intermediate in composition (e.g., rhyolitic, dacitic, andesite, pantellerite, phonolite, trachyte), but basaltic and other compositions are known.