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marl

marl

SRI Petrography ID: 67

marl

Kieslinger Dekorgestein und Baugesteinsammlung
GBA-ID.-No.: 3063, drawer-No: 231

Names

[de] Mergel
[en] marl

Description

Marl is a sedimentary rock made of clay and limestone, which belongs to the family of pelitic rocks (clays <0.02 mm, the fine particles in water sales) and a carbonate is a variety of mudstone. The rocks can be both clastic and chemical-biogenic origin.
The carbonate can be washed in as detritus, often goes back to the carbonate skeletons of plankton or biochemically precipitated calcite.
On the seabed to collect layers of calcite and clay sediments, which are becoming more powerful over time and compacted by the weight of younger sediments onlay. Furthermore, responding in the sediment pore solution with the mineral matter and the sediment is gradually changing into a rock.
The trivial term ruin marble (also landscape marble) refers to limestone and marl (as calcitic overprinted mud stones).

Color

green, brown, beige and gray - grayish white

Grain Size

very fine grained


Texture

conchoidal fracture


Minerals

Marl nearly consists of equal numbers clays and calcite or dolomite. Furthermore quartz, mica, pyrite and gypsum may be present.

Occurences

Marl occurs worldwide, the variety ruin marble in Italy (near Florence), Austria, Czech Republic and Pakistan.

Comments


Depending on the amount of clay and lime, it is either called lime marl or clay marl.
high percentage of limestone (up to 95% lime, 5% clay)
marly limestone (up to 85% calcium, 15% clay)
Mergelkalk (up to 75% calcium, 25% clay)
Marl (up to 65% calcium, 35% clay)
Marl (up to 35% calcium, 65% clay)
Marl (up to 25% calcium, 75% clay)
Marl (up to 15% calcium, 85% clay)
marly clay (up to 5% calcium, 95% clay)
high percent clay (up to 0% lime, 100% clay)
The use is mainly as a raw material in the manufacture of Portland cement.
Ruin marble has often been used since the Renaissance and then in the Baroque period for stone inlay on cabinets, tables and sideboards.

Classification

Class

SEDIMENTARY ROCKS

Broader Terms

carbonate sedimentary rocks

Narrower Terms

Austria-marl

France-marl

Germany-marl

Italy-marl