GENERALLY LIGHT – COLORED(Few Iron – Magnesian minerals)

GENERALLY DARK-COLORED (FE&Mg

melimpah)

Orthoklas dominanOrthoklas and plagioklas about equal

Plagioklas Dominan PlagioklasNo/

Plagioklas

Coarse = Grained ; mineral reconizable by eye or lens intrusive

faneritik

QuartzNo

QuartzQuartz No Quartz Quartz No Quartz Gabro Peridotit

CortlanditeDunite(no volcanic equivalents)

Granite Pegmatit

SyeniteNapheliteSyenite

Quartz MonzoniteGranodiorite

MonzoniteQuartz Diorite

DioriteAnorthositeDolerite

Diabase

Fanero Porphyritic

Granite Porphyri

SyenitePorphyri

Quartz MonzonitePorphyriGranodiorite Porphyri

MonzonitePorphyri

Quartz Diorite Porphyri

Diorite porphyri

Gabro Pophyri

Dense or very fine grained ; few minerals recognizable.Extrusive or intrusive near surface

Porphyro afanitik

RhyoliteTrachite Phonolite

Latite DasiteAndesite Porphyri

Basalt Pophyri

Limburgitafanitik Felsite Andesite Basalt

Class, wholly or in part

Not porphyritic

Obsidian (dark), Pithstone, Perlite, fumice, etc Trachite

Extrusive Porphyritic Vitrophyre (=obsidian porphyri and pitchsone pophyri)Fragmental;may form layers Extrusive

Volcanic Ash, Tuff, Aglomerate, Breccia, etc.