Specific Varieties of Rocks
The following are terms for rocks that are not petrographically or genetically distinct but are defined according to various other criteria; most are specific classes of other rocks, or altered versions of existing rocks. Some archaic and vernacular terms for rocks are also included.
- Adamellite - a variety of quartz monzonite
- Appinite - a group of varieties of lamprophyre, mostly rich in hornblende
- Aphanite - an aphanitic felsic volcanic rock which confounds identification via optical means
- Borolanite - a variety of nepheline syenite from Loch Borralan, Scotland
- Blue Granite - essentially larvikite, a monzonite
- Epidosite - a type of metasomatite; essentially altered basalt
- Felsite - an aphanitic felsic volcanic rock which confounds identification via optical means
- Flint - typically a form of chert, jasper, or tuff
- Ganister - a Cornish term for a palaeosol formed on sandstone
- Ijolite - a silica-undersaturated plutonic rock associated with nepheline syenites
- Jadeitite - a very rare rock formed by concentration of jadeite pyroxene; a form of serpentinite
- Jasperoid - a hematite-silica metasomatite analogous to a skarn
- Kenyte - a variety of phonolite, first found on Mount Kenya
- Vogesite - a variety of lamprophyre
- Larvikite - a variety of monzonite with microperthitic ternary feldspars from Larvik, Norway
- Litchfieldite - a metamorphosed nepheline syenite occurrence near Litchfield, Maine
- Luxullianite - a tourmaline-bearing granite with a peculiar texture, occurring at Luxulyan, Cornwall, England
- Mangerite - a hypersthene-bearing monzonite
- Minette - a variety of lamprophyre
- Novaculite - a chert formation found in Oklahoma, Arkansas and Texas
- Pyrolite - a chemical analogue considered to theoretically represent the earth's upper mantle
- Rapakivi granite - a granite which exhibits the peculiar rapakivi texture
- Rhomb porphyry - a type of latite with euhedral rhombic phenocrysts of feldspar
- Shonkinite - melitilic and kalsititic rocks
- Taconite - banded iron formation, primarily used in the United States of America
- Teschenite - essentially a silica undersaturated, analcime bearing gabbro
- Theralite - essentially a nepheline gabbro
- Variolite - devitrified glass
Read more about this topic: List Of Rock Types
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