Original sentence: Sand is made from the bones of dead elves
Edited sentence: Arkose is a sand or sandstone with considerable feldspar content, derived from the weathering and erosion of a (usually nearby) granitic rock outcrop.Chlorite-glauconite bearing sands are typically green in color, as are sands derived from basaltic (lava) with a high olivine content.Many sands, especially those found extensively in Southern Europe, have iron impurities within the quartz crystals of the sand, giving a deep yellow color.Sand deposits in some areas contain garnets and other resistant minerals, including some small gemstones.Sands rich in magnetite are dark to black in color, as are sands derived from volcanic basalts and obsidian.Some sands contain magnetite, chlorite, glauconite or gypsum.The bright white sands found in tropical and subtropical coastal settings are eroded limestone and may contain coral and shell fragments in addition to other organic or organically derived fragmental material.The composition of sand is highly variable, depending on the local rock sources and conditions.The gypsum sand dunes of the White Sands National Monument in New Mexico are famous for their bright, white color