Porphyry and Gneiss Types and Facts

Porphyry

Gneiss

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1 Types

1.1 Types

Rhomb Porphyry

Augen Gneiss, Henderson Gneiss, Lewisian Gneiss, Archean and Proterozoic Gneiss.

1.2 Features

Generally rough to touch, Is one of the oldest rock, Surfaces are often shiny

Generally rough to touch, Is one of the oldest rock

1.3 Archaeological Significance

1.3.1 Monuments

Used

1.3.2 Famous Monuments

Data Not Available

Konark Sun Temple in India, Washington Monument, US

1.3.3 Sculpture

Used

Not Yet Used

1.3.4 Famous Sculptures

Data Not Available

Not Applicable

1.3.5 Pictographs

Not Used

1.3.6 Petroglyphs

Not Used

1.3.7 Figurines

Used

Not Yet Used

1.4 Fossils

Absent

Types of Porphyry and Gneiss

Some rocks according to their use or texture are classified into different types. Know more about Porphyry Texture and Gneiss Texture. Types of Porphyry are Rhomb Porphyry whereas the types of Gneiss are Augen Gneiss, Henderson Gneiss, Lewisian Gneiss, Archean and Proterozoic Gneiss..During historic times, some rocks depending on their hardness were used to create Pictographs and Petroglyphs. Rocks which are hard were generally not used. Pictographs are paintings or drawings that have been placed or created on the surface of rock. Porphyry and Gneiss were not used for creating pictographs. Petroglyph is an image which is carved into a rock. These are images created by removing part of a rock surface by incising, picking, carving or abrading, as a form of rock art. Porphyry and Gneiss were not used for creating petroglyphs.