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- Slate abstract "Slate is a fine-grained, foliated, homogeneous metamorphic rock derived from an original shale-type sedimentary rock composed of clay or volcanic ash through low-grade regional metamorphism. It is the finest grained foliated metamorphic rock. Foliation may not correspond to the original sedimentary layering, but instead is in planes perpendicular to the direction of metamorphic compression.The very strong foliation is called "slaty cleavage". It is caused by strong compression causing fine grained clay flakes to regrow in planes perpendicular to the compression. When expertly "cut" by striking parallel to the foliation, with a specialized tool in the quarry, many slates will form smooth flat sheets of stone which have long been used for roofing and floor tiles and other purposes. Slate is frequently grey in color, especially when seen, en masse, covering roofs. However, slate occurs in a variety of colors even from a single locality; for example, slate from North Wales can be found in many shades of grey, from pale to dark, and may also be purple, green or cyan. Slate is not to be confused with shale, from which it may be formed, or schist. Ninety percent of Europe's natural slate used for roofing originates from Spain.The word "slate" is also used for certain types of object made from slate rock. It may mean a single roofing tile made of slate, or a writing slate. This was traditionally a small smooth piece of the rock, often framed in wood, used with chalk as a notepad or noticeboard, and especially for recording charges in pubs and inns. The phrases "clean slate" and "blank slate" come from this usage.".
- Slate thumbnail SlateUSGOV.jpg?width=300.
- Slate wikiPageExternalLink turner01.html.
- Slate wikiPageExternalLink Howers%20Lightning%20Slate%20Reckoner%201888%20-%201904.pdf.
- Slate wikiPageExternalLink www.aditnow.co.uk.
- Slate wikiPageExternalLink www.slatevalleymuseum.org.
- Slate wikiPageExternalLink Slate_taxonomy.html.
- Slate wikiPageExternalLink 4zVmtLOmjVw.
- Slate wikiPageID "44214".
- Slate wikiPageRevisionID "605439244".
- Slate caption "Slate".
- Slate composition Illite.
- Slate composition Muscovite.
- Slate composition Quartz.
- Slate compositionSecondary Biotite.
- Slate compositionSecondary Chlorite_group.
- Slate compositionSecondary Hematite.
- Slate compositionSecondary Pyrite.
- Slate hasPhotoCollection Slate.
- Slate name "Slate".
- Slate type "Metamorphic".
- Slate typeLink "Metamorphic rock".
- Slate subject Category:Building_materials.
- Slate subject Category:Building_stone.
- Slate subject Category:Dielectrics.
- Slate subject Category:Metamorphic_rocks.
- Slate subject Category:Natural_materials.
- Slate subject Category:Pavements.
- Slate subject Category:Slate.
- Slate subject Category:Stone.
- Slate comment "Slate is a fine-grained, foliated, homogeneous metamorphic rock derived from an original shale-type sedimentary rock composed of clay or volcanic ash through low-grade regional metamorphism. It is the finest grained foliated metamorphic rock. Foliation may not correspond to the original sedimentary layering, but instead is in planes perpendicular to the direction of metamorphic compression.The very strong foliation is called "slaty cleavage".".
- Slate label "Ardesia".
- Slate label "Ardoise".
- Slate label "Ardósia".
- Slate label "Leisteen".
- Slate label "Pizarra (roca)".
- Slate label "Schiefer".
- Slate label "Slate".
- Slate label "Łupek".
- Slate label "Шифер".
- Slate label "اردواز".
- Slate label "板岩".
- Slate label "粘板岩".
- Slate sameAs Břidlice.
- Slate sameAs Schiefer.
- Slate sameAs Pizarra_(roca).
- Slate sameAs Arbel.
- Slate sameAs Ardoise.
- Slate sameAs Ardesia.
- Slate sameAs 粘板岩.
- Slate sameAs 점판암.
- Slate sameAs Leisteen.
- Slate sameAs Łupek.
- Slate sameAs Ardósia.
- Slate sameAs m.0c1ml.
- Slate sameAs Q207079.
- Slate sameAs Q207079.
- Slate wasDerivedFrom Slate?oldid=605439244.
- Slate depiction SlateUSGOV.jpg.
- Slate isPrimaryTopicOf Slate.