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diorite

diorite

SRI Petrography ID: 19

Gebhartser fine
Lower Austria

diorite

Kieslinger Dekorgestein und Baugesteinsammlung
GBA-ID.-No.: 779, drawer-No: 65

Names

[de] Diorit
[en] diorite

Description

Medium to coarse grained, medium to dark igneous rock, containing little or no quartz. Main mineral content: low-calcium Plagioclase Feldspar (about two third) and dark minerals (Hornblende, Biotite, Pyroxene)

Color

medium to dark

Grain Size

Medium to coarse grained

Texture

Granular texture

Minerals

low-calcium plagioclase as main mineral (grey or white), hornblende, biotite, pyroxene (+ quartz + orthoclase)

Occurences

diorite is a relatively rare rock occurrences e.g. in Egypt, Italy, Finland, Romania

Comments

Diorite is the plutonic equivalent of andesite
Diorite containing more quartz is called quartz-diorite or tonalite
seldomly used as ornamental building stone (“Imperial rock”), sometimes sold as „black granite“.

Classification

Class

IGNEOUS ROCKS

Broader Terms

coarse-grained crystalline rocks

Narrower Terms

Austria-diorite

Czech-Republic-diorite

Egypt-diorite

Finland-diorite

France-diorite

Germany-diorite

Greece-diorite

Slovenia-diorite

Sweden-diorite