Gemstones

Marl



Marl
Marl,or,marlstone,is,a,calcium,carbonate,or,lime-rich,mud,or,mudstone,which,contains,variable,amounts,of,clays,and,silt,The,dominant,carbonate,mineral,in,most,marls,is,calcite,,but,other,carbonate,minerals,such,as,aragonite,,dolomite,,and,siderite,may,be,present,Marl,was,originally,an,old,term,loosely,applied,to,a,variety,of,materials,,most,of,which,occur,as,loose,,earthy,deposits,consisting,chiefly,of,an,intimate,mixture,of,clay,and,calcium,carbonate,,formed,under,freshwater,conditions;,specifically,an,earthy,substance,containing,35–65%,clay,and,65–35%,carbonate1,It,also,describes,a,habit,of,coralline,red,alga2,The,term,is,today,often,used,to,describe,indurated,marine,deposits,and,lacustrine,lake,sediments,which,more,accurately,should,be,named,marlstone,Marlstone,is,an,indurated,resists,crumbling,or,powdering,rock,of,about,the,same,composition,as,marl,,more,correctly,called,an,earthy,or,impure,argillaceous,limestone,It,has,a,blocky,subconchoidal,fracture,,and,is,less,fissile,than,shale,The,term,marl,is,widely,used,in,English-language,geology,,while,the,terms,Mergel,and,Seekrmarlboro.com,,marla,maples,,marlon,brando,,marlboro,,marlo,thomas,,marley,shelton,Marl
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