File:Натуральный (необработанный) кусок мела.JPG
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Summary
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Русский: Мел — осадочная горная порода белого цвета, мягкая и рассыпчатая, нерастворимая в воде, органического (зоогенного) происхождения. Основу химического состава мела составляет карбонат кальция с небольшим количеством карбоната магния, но обычно присутствует и некарбонатная часть, в основном оксиды металлов. В меле обычно находится незначительная примесь мельчайших зёрен кварца и микроскопические псевдоморфозы кальцита по ископаемым морским организмам (радиолярии и др.) Нередко встречаются крупные окаменелости мелового периода: белемниты, аммониты и др. English: Chalk — sedimentary rock of white, soft and friable, insoluble in water, organic (zoogenic) origin. The basis of the chemical composition of chalk is calcium carbonate with a small amount of magnesium carbonate, but usually is present and non-carbonate part of mainly metal oxides. The chalk is usually a slight admixture of fine grains of quartz and microscopic calcite pseudomorphs on fossil marine organisms (Radiolaria, etc.) Often found large fossils of the Cretaceous period: belemnites, Ammonites, etc. |
| Date | |
| Source | Own work |
| Author | Superagent001 |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 18:25, 19 November 2015 | | 2,560 × 1,920 (1.55 MB) | Superagent001 | User created page with UploadWizard |
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_кусок_мела.JPG){kind=link}