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breccia

breccia

SRI Petrography ID: 61

Hötting
Tirol

breccia
lime-breccia
breccia tigrata

Dekorgestein und Baugesteinsammlung
NHM-Inv.-No.: G7328
SRI-No.: 530-61

breccia
lime-breccia
fiorita breccia
persichina breccia
braccetta fiorita persichina

Dekorgestein und Baugesteinsammlung
NHM-Inv.-No.: G7327
SRI-No.: 531-61

breccia
lime-breccia
breccia antica traccagnina rossa

Dekorgestein und Baugesteinsammlung
NHM-Inv.-No.: G7327
SRI-No.: 532-61

Names

[de] Breccie
[en] breccia

Description

hard or soft sedimentary rock, composed of angular, gravel-size fragments in a fine grained matrix. Breccia is the consolidated equivalent of rubble.
More than 50% of the components have to be larger than 2 mm (below this grain size: sandstone).
The angularity of fragments is defined as roundness aequivalent. Below 0.25, after another definitions below 0.1 fragments are called angular. Sediments with rounder fragments above 2 mm diameter are defined as conglomerates.
Breccia commonly results from processes such as landslides or faulting when rocks are fractured. The fractured rocks are often cemented in situ by aqueous solutions, often supersaturated in calcite (aragonite).
Besides this breccia type also intraformational or intraclastic breccias exist, formed by breakup and incorporation of sediment aggregates within the same formation.

Color

variable. Matrix often brown to yellow

Grain Size

Matrix fine grained, fragments from 2 mm to m

Texture

brecciated

Minerals

matrix often calcitic, sometimes aragonitic

Occurences

various sites. Breccias are appreciated building stones of many important cities

Comments

Related rocks:
Sandstone: sedimentary rock consisting of matrix and components below 2mm
conglomerate: sedimentary rock with rounded components above 2mm
volcanic breccia: breccia formed by volcanic activity

Classification

Class

SEDIMENTARY ROCKS

Broader Terms

clastic sedimentary rocks

Narrower Terms

Africa-breccia

Austria-breccia

Egypt-breccia

France-breccia

Germany-breccia

Grecce-breccia

Italy-breccia

Spain-breccia

Sudan-breccia