Porphyry and Banded iron formation Types and Facts
Types
Rhomb Porphyry
Algoma-type , Lake Superior-type, Superior-type and Taconite
Features
Generally rough to touch, Is one of the oldest rock, Surfaces are often shiny
Is one of the oldest rock
Archaeological Significance
Monuments
Used
Not Yet Used
Famous Monuments
Data Not Available
Not Applicable
Sculpture
Used
Not Yet Used
Famous Sculptures
Data Not Available
Not Applicable
Pictographs
Not Used
Not Used
Petroglyphs
Not Used
Not Used
Figurines
Used
Not Yet Used
Types of Porphyry and Banded iron formation
Some rocks according to their use or texture are classified into different types. Know more about Porphyry Texture and Banded iron formation Texture. Types of Porphyry are Rhomb Porphyry whereas the types of Banded iron formation are Algoma-type , Lake Superior-type, Superior-type and Taconite.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 Banded iron formation 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 Banded iron formation were not used for creating petroglyphs.