El sienogranit és una roca ígniaplutònica que presenta una composició granítica. És una roca generalment fèlsica. Generalment el feldespat que es troba en els sienogranits és feldespat alcalí (normalment ortòclasi); la roca presenta entre un 20 i un 60% de quars. El sienogranit és similar a la sienita, i la seva major diferència amb aquesta és el contingut de quars (la sienita té un contingut inferior (15-20%)).[1] Normalment la biotita domina sobre l'hornblenda i pot haver-hi presència de rútil i moscovita com a minerals accessoris. Alguns sienogranits presenten amfíbol idiomòrfic (hornblenda i edenita) [2]
↑Bley, Benjamin, Peter Christian Hackspacher, Elton Luizdantas, and William Randall Van Schmus. (1998) "Archean Accretion in the Sao Jose do Campestre Massif, Borborema Province, Northeast Brazil." Revista Brasileirade Geociencias, Vol. 28
↑Mafti, Mohammed Rashad H. (2001) "Age, Geochemistry and Origin of the Peraluminous A-Type Granitoids of the Ablah-Shuwas Pluton, Ablah Graben Arabian Shield." Faculty of Earth Sciences, King Abdulaziz University, Acta Mineralogica-Petrographica, Vol. 42, pp. 5–20.
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