Macroscopic Petrographic Description: Intrusive Magmatic Rocks

Vocabulary flashcards covering the classification and specific samples of intrusive magmatic rocks with low color indices, including granites, granodiorites, tonalites, and syenites.

Intrusive magmatic rocks with $M < 90$

A category of plutonic rocks characterized by a color index ($M$) lower than 90, including granitic and syenitic groups.

Granito a biotite (P2)

A granitic rock sample characterized by the primary presence of the mineral biotite.

Monzogranito a biotite (P1)

A specific type of granitic rock classified as monzogranite containing biotite.

Granito porfirico a biotite (P3)

A biotite-bearing granitic rock exhibiting a porphyritic texture.

Granodiorite anfibolico-biotitica (P12)

An intrusive rock of granodioritic composition containing both amphibole and biotite.

Tonalite anfibolico-biotitica (P15, P16, P17)

An intrusive rock of tonalitic composition characterized by the presence of amphibole and biotite.

Sienite anfibolico-biotitica (P19, P20, P79)

A syenitic rock containing amphibole and biotite as significant mineral phases.

Monzonite anfibolico-biotitica (P23)

An intrusive rock of monzonitic composition featuring amphibole and biotite.

Sienite a nefelina (P37)

A type of feldspathoid syenite (Sieniti a feldspatoidi) containing the mineral nepheline.

Monzosienite a nefelina (P38)

A feldspathoid-bearing monzosyenite containing nepheline.

Monzosienite a sodalite (P39)

A feldspathoid-bearing monzosyenite characterized by the presence of sodalite.