[{"@context":"https:\/\/schema.org\/","@type":"Article","@id":"https:\/\/www.tisktuma.cz\/co-vime-o-piskovci\/#Article","mainEntityOfPage":"https:\/\/www.tisktuma.cz\/co-vime-o-piskovci\/","headline":"Co v\u00edme o p\u00edskovci","name":"Co v\u00edme o p\u00edskovci","description":"do by neznal Prav\u010dickou br\u00e1nu, Dr\u00e1bsk\u00e9 sv\u011btni\u010dky, Adr\u0161pa\u0161sko-Teplick\u00e9 sk\u00e1ly nebo Labsk\u00e9 p\u00edskovce. Jsou to jedine\u010dn\u00e9 p\u0159\u00edrodn\u00ed \u010di lidsk\u00e9 v\u00fdtvory a v\u0161echny je spojuje jedin\u00fd spole\u010dn\u00fd znak \u2013 velmi roz\u0161\u00ed\u0159en\u00fd a kr\u00e1sn\u00fd p\u0159\u00edrodn\u00ed materi\u00e1l s n\u00e1zvem p\u00edskovec. Odkud pramen\u00ed n\u00e1zev \u2013 n\u00e1zev p\u00edskovec nez\u00edskal tento nerost n\u00e1hodou, je doopravdy odvozen od p\u00edsku a zjednodu\u0161en\u011b \u0159e\u010deno jde […]","datePublished":"2021-07-10","dateModified":"2023-09-21","author":{"@type":"Person","@id":"https:\/\/www.tisktuma.cz\/author\/devene\/#Person","name":"devene","url":"https:\/\/www.tisktuma.cz\/author\/devene\/","identifier":1,"image":{"@type":"ImageObject","@id":"https:\/\/secure.gravatar.com\/avatar\/8eaf08ef5a7e54fc91db02b2058b03bc913caaaa39c046819bbf43d06bd23c2b?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/8eaf08ef5a7e54fc91db02b2058b03bc913caaaa39c046819bbf43d06bd23c2b?s=96&d=mm&r=g","height":96,"width":96}},"publisher":{"@type":"Organization","name":"tisktuma.cz","logo":{"@type":"ImageObject","@id":"\/logo.png","url":"\/logo.png","width":600,"height":60}},"image":{"@type":"ImageObject","@id":"https:\/\/www.tisktuma.cz\/wp-content\/uploads\/Prav%C4%8Dick%C3%A1%20br%C3%A1na_3.jpg","url":"https:\/\/www.tisktuma.cz\/wp-content\/uploads\/Prav%C4%8Dick%C3%A1%20br%C3%A1na_3.jpg","height":0,"width":0},"url":"https:\/\/www.tisktuma.cz\/co-vime-o-piskovci\/","about":["V\u00fdrobky"],"wordCount":396,"articleBody":"     do by neznal Prav\u010dickou br\u00e1nu, Dr\u00e1bsk\u00e9 sv\u011btni\u010dky, Adr\u0161pa\u0161sko-Teplick\u00e9 sk\u00e1ly nebo Labsk\u00e9 p\u00edskovce. Jsou to jedine\u010dn\u00e9 p\u0159\u00edrodn\u00ed \u010di lidsk\u00e9 v\u00fdtvory a v\u0161echny je spojuje jedin\u00fd spole\u010dn\u00fd znak \u2013 velmi roz\u0161\u00ed\u0159en\u00fd a kr\u00e1sn\u00fd p\u0159\u00edrodn\u00ed materi\u00e1l s n\u00e1zvem p\u00edskovec.Odkud pramen\u00ed n\u00e1zev \u2013 n\u00e1zev p\u00edskovec nez\u00edskal tento nerost n\u00e1hodou, je doopravdy odvozen od p\u00edsku a zjednodu\u0161en\u011b \u0159e\u010deno jde o p\u00edsek, kter\u00fd vlivem dlouhodob\u00fdch p\u0159\u00edrodn\u00edch jev\u016f z\u00edskal tuto podobu. Z\u00e1klad p\u00edskovc\u016f tedy tvo\u0159\u00ed velmi drobn\u00e1 p\u00edse\u010dn\u00e1 zrnka spojen\u00e1 velmi r\u016fznorod\u00fdmi pojivy (n\u00e1nosy j\u00edl\u016f, v\u00e1pencem – uhli\u010ditanem v\u00e1penat\u00fdm a n\u011bkter\u00fdmi oxidy) a stla\u010den\u00e1 pod r\u016fzn\u00fdmi tlaky, v\u011bt\u0161inou na dn\u011b prehistorick\u00fdch oce\u00e1n\u016f. Druh pojiva a tlak horniny rozhoduje o tom, zda p\u016fjde o materi\u00e1l velmi por\u00e9zn\u00ed a m\u011bkk\u00fd, nebo naopak pevn\u00fd a tvrd\u00fd. Por\u00e9zn\u00ed p\u00edskovce se vyu\u017e\u00edvaj\u00ed nap\u0159. pro um\u011bleck\u00e9 p\u0159edm\u011bty a znaj\u00ed je akvarist\u00e9 jako vzduchovac\u00ed kameny. Z tuh\u00fdch p\u00edskovc\u016f se vyr\u00e1b\u00ed obkladov\u00fd a dla\u017eebn\u00ed materi\u00e1l, vhodn\u00fd p\u0159edev\u0161\u00edm do interi\u00e9ru a za ur\u010dit\u00fdch podm\u00ednek i v exteri\u00e9ru.Vlastnosti p\u00edskovcov\u00e9ho obkladu a dla\u017eby \u2013 u p\u00edskovc\u016f byste m\u011bli db\u00e1t p\u0159edev\u0161\u00edm na mrazuvzdornost a s t\u00edm souvisej\u00edc\u00ed nenas\u00e1kavost vodou. \u010c\u00edm v\u00edce tento materi\u00e1l absorbuje vodn\u00ed masu, t\u00edm m\u00e9n\u011b je vhodn\u00fd pro dla\u017ebu, zvl\u00e1\u0161t\u011b pro venkovn\u00ed \u00fa\u010dely. Podstatn\u00e1 je rovn\u011b\u017e odolnost v\u016f\u010di ot\u011bru a tvrdost. Existuj\u00ed stupnice, podle nich\u017e snadno rozpozn\u00e1te, zda je k\u00e1men vhodn\u00fd jako dla\u017eebn\u00ed materi\u00e1l, a p\u00edskovcov\u00e9 obklady a dla\u017eba tak\u00e9 mus\u00ed b\u00fdt t\u011bmito symboly \u0159\u00e1dn\u011b ozna\u010dena.Je velmi dekorativn\u00ed \u2013 obkladov\u00fd materi\u00e1l z p\u00edskovc\u016f je opravdu n\u00e1dhern\u00fd, jsou na n\u011bm patrn\u00e9 jednotliv\u00e9 vrstvy sediment\u016f tak, jak postupem \u010dasu, v pr\u016fb\u011bhu milion\u016f let, usedaly na oce\u00e1nsk\u00e9 dno. V\u011bt\u0161inou jsou zbarven\u00e9 do okrov\u00e9, kr\u00e9mov\u00e9 a\u017e sv\u011btle hn\u011bd\u00e9 a vytv\u00e1\u0159\u00ed t\u00edm velmi p\u016fsobiv\u00e9, tepl\u00e9 prost\u0159ed\u00ed, a p\u0159edev\u0161\u00edm v p\u0159\u00edrodn\u00edm, p\u0159irozen\u00e9m duchu.                                                                                                                                                                                                                                                                                                                                                                                         3\/5 - (2 votes)        "},{"@context":"https:\/\/schema.org\/","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Co v\u00edme o p\u00edskovci","item":"https:\/\/www.tisktuma.cz\/co-vime-o-piskovci\/#breadcrumbitem"}]}]