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Tephrite
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<p>Tephrite is an <a href="/facts/Igneous_rock/xeMJhUah">igneous</a>, <a href="/facts/Volcanic/c2M5upml">volcanic</a> (<a href="/facts/Extrusive/AAFoj1BF">extrusive</a>) <a href="/facts/Rock_(geology)/FXCJkmop">rock</a>, with <a href="/facts/Aphanitic/nqFPUEjV">aphanitic</a> to <a href="/facts/Porphyritic/G81JCEky">porphyritic</a> <a href="/facts/Texture_(crystalline)/c4rhvqus">texture</a>. <a href="/facts/Mineral/LkUFbNmv">Mineral</a> content is usually abundant <a href="/facts/Feldspathoid/a2hPbGCg">feldspathoids</a> (<a href="/facts/Leucite/l1uVJHtm">leucite</a> or <a href="/facts/Nepheline/2PXytbnE">nepheline</a>), <a href="/facts/Plagioclase/X0XLHGKU">plagioclase</a>, and lesser alkali <a href="/facts/Feldspar/DVvFnfA9">feldspar</a>. <a href="/facts/Pyroxene/hWMTLF9o">Pyroxenes</a> (clinopyroxenes) are common accessory minerals. <a href="/facts/Quartz/4n86tE2G">Quartz</a> and <a href="/facts/Olivine/tLLL4rae">olivine</a> are absent. The absence of olivine distinguishes them from the otherwise similar <a href="/facts/Basanite/29aUR5Ao">basanite</a>. It's parameters are defined in the <a href="/facts/QAPF/HgX5ys5K">QAPF</a> diagram. Occurrences include leucite nepheline tephrite from Hamberg bei Neckarelz near <a href="/facts/Heidelberg/jfbzRTo0">Heidelberg</a>, <a href="/facts/Germany/paluuWBX">Germany</a>, phonolite-tephrite at <a href="/facts/Monte_Vulture/6KGcoQd0">Monte Vulture</a>, <a href="/facts/Basilicata/cUK7Uny4">Basilicata</a>, Italy and <a href="/facts/Basanite/29aUR5Ao">basanite</a>–tephrite <a href="/facts/Intrusion/y65IUQps">intrusions</a> in <a href="/facts/Namibia/ahXuaypy">Namibia</a>. </p>