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Inorganic compound
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<p>An inorganic compound is typically a <a href="/facts/Chemical_compound/37FXqqtv">chemical compound</a> that lacks <a href="/facts/Carbon%E2%80%93hydrogen_bond/yA8K48Ga">carbon–hydrogen bonds</a>—that is, a compound that is not an <a href="/facts/Organic_compound/gqCNaN45">organic compound</a>. The study of inorganic compounds is a subfield of chemistry known as <i><a href="/facts/Inorganic_chemistry/ErD6ypnb">inorganic chemistry</a></i>. </p><p>Inorganic compounds comprise most of the <a href="/facts/Earth%27s_crust/VSy2u31r">Earth's crust</a>, although the compositions of the deep <a href="/facts/Mantle_(geology)/RpDdtjCr">mantle</a> remain active areas of investigation. </p><p>All <a href="/facts/Allotrope/2WUdHWxg">allotropes</a> (structurally different pure forms of an element) and some simple <a href="/facts/Carbon/ukrgQexo">carbon</a> compounds are often considered inorganic. Examples include the allotropes of carbon (<a href="/facts/Graphite/sSf3KMXr">graphite</a>, <a href="/facts/Diamond/IBUdnd1y">diamond</a>, <a href="/facts/Buckminsterfullerene/F0VebtPK">buckminsterfullerene</a>, <a href="/facts/Graphene/QDGUBaPt">graphene</a>, etc.), <a href="/facts/Carbon_monoxide/CKuLtEMJ">carbon monoxide</a> CO, <a href="/facts/Carbon_dioxide/xGzpppEp">carbon dioxide</a> CO2, <a href="/facts/Carbide/xfCMTjYJ">carbides</a>, and <a href="/facts/Salt_(chemistry)/lsSKwGpn">salts</a> of inorganic <a href="/facts/Anion/wrbwhF3z">anions</a> such as <a href="/facts/Carbonate/FES1QHkN">carbonates</a>, <a href="/facts/Cyanide/t0o8FMKI">cyanides</a>, <a href="/facts/Cyanate/EcDWGQQh">cyanates</a>, <a href="/facts/Thiocyanate/S438CJp8">thiocyanates</a>, <a href="/facts/Isothiocyanate/zk3Q3Pv8">isothiocyanates</a>, etc. Many of these are normal parts of mostly organic systems, including <a href="/facts/Organism/j8JkL09u">organisms</a>; describing a chemical as inorganic does not necessarily mean that it cannot occur within <a href="/facts/Life/DNw7NUId">living</a> things. </p>