Adamellite
What is Adamellite?
Quartz monzonite or adamellite is an intrusive, felsic, igneous rock where two feldspar (Plagioclase and Alkali Feldspar) are approximately equal in quantity. Rest of the mineral constituent are quartz, biotite or hornblende. It is typically a light colored phaneritic (coarse-grained) to porphyritic granitic rock. The plagioclase is typically intermediate to sodic in composition, andesine to oligoclase.
Its appearance is often similar to granite. But whereas granite contains more than 20% quartz, quartz monzonite is only 5–20% quartz. Rock with less than five percent quartz is classified as monzonite. The fine-grained volcanic rock equivalent of quartz monzonite is quartz latite.
The name is derived from the type locality of Adamello in the Tyrol where granites of this type were originally defined.
What is Adamellite?
Quartz monzonite or adamellite is an intrusive, felsic, igneous rock where two feldspar (Plagioclase and Alkali Feldspar) are approximately equal in quantity. Rest of the mineral constituent are quartz, biotite or hornblende. It is typically a light colored phaneritic (coarse-grained) to porphyritic granitic rock. The plagioclase is typically intermediate to sodic in composition, andesine to oligoclase.
Its appearance is often similar to granite. But whereas granite contains more than 20% quartz, quartz monzonite is only 5–20% quartz. Rock with less than five percent quartz is classified as monzonite. The fine-grained volcanic rock equivalent of quartz monzonite is quartz latite.
The name is derived from the type locality of Adamello in the Tyrol where granites of this type were originally defined.