{"title":"Litofise","description":"\u003cp data-start=\"0\" data-end=\"195\"\u003eLa \u003cstrong data-start=\"3\" data-end=\"17\"\u003elitofiscia\u003c\/strong\u003e è un'interessante struttura geologica che si trova in certi tipi di rocce vulcaniche, in particolare nelle \u003cstrong data-start=\"138\" data-end=\"151\"\u003erioliti\u003c\/strong\u003e. \u003c\/p\u003e\n\u003chr data-start=\"197\" data-end=\"200\"\u003e\n\u003ch3 data-start=\"202\" data-end=\"223\"\u003e🔍 \u003cstrong data-start=\"209\" data-end=\"223\"\u003eDefinizione\u003c\/strong\u003e\n\n\u003c\/h3\u003e\n\u003cp data-start=\"224\" data-end=\"491\"\u003eIl termine \u003cstrong data-start=\"231\" data-end=\"245\"\u003elitofiscia\u003c\/strong\u003e deriva dal greco \u003cem data-start=\"260\" data-end=\"268\"\u003elithos\u003c\/em\u003e (pietra) e \u003cem data-start=\"281\" data-end=\"288\"\u003ephysa\u003c\/em\u003e (bolla, soffio). Indica una \u003cstrong data-start=\"322\" data-end=\"341\"\u003ecavità arrotondata\u003c\/strong\u003e o \u003cstrong data-start=\"345\" data-end=\"354\"\u003eovale\u003c\/strong\u003e presente in alcune rocce vulcaniche, generalmente \u003cstrong data-start=\"412\" data-end=\"463\"\u003eriempita parzialmente o totalmente di cristalli\u003c\/strong\u003e o di minerali secondari.\u003c\/p\u003e\n\u003chr data-start=\"493\" data-end=\"496\"\u003e\n\u003ch3 data-start=\"498\" data-end=\"518\"\u003e🪨 \u003cstrong data-start=\"505\" data-end=\"518\"\u003eFormazione\u003c\/strong\u003e\n\n\u003c\/h3\u003e\n\u003cp data-start=\"519\" data-end=\"688\"\u003eLe litofiscie si formano durante il \u003cstrong data-start=\"554\" data-end=\"588\"\u003eraffreddamento del magma acido\u003c\/strong\u003e (ricco di silice), in particolare nelle \u003cstrong data-start=\"627\" data-end=\"640\"\u003erioliti\u003c\/strong\u003e o \u003cstrong data-start=\"644\" data-end=\"659\"\u003eossidiane\u003c\/strong\u003e. Durante il raffreddamento:\u003c\/p\u003e\n\u003col data-start=\"690\" data-end=\"1105\"\u003e\n\n\u003cli data-start=\"690\" data-end=\"754\"\u003e\n\n\u003cp data-start=\"693\" data-end=\"754\"\u003eDelle \u003cstrong data-start=\"697\" data-end=\"714\"\u003ebolle di gas\u003c\/strong\u003e si formano nella lava ancora pastosa.\u003c\/p\u003e\n\n\n\u003c\/li\u003e\n\n\u003cli data-start=\"755\" data-end=\"829\"\u003e\n\n\u003cp data-start=\"758\" data-end=\"829\"\u003eQueste bolle rimangono intrappolate nella roccia in via di solidificazione.\u003c\/p\u003e\n\n\n\u003c\/li\u003e\n\n\u003cli data-start=\"830\" data-end=\"915\"\u003e\n\n\u003cp data-start=\"833\" data-end=\"915\"\u003eCon il tempo, i gas fuoriescono o si dissolvono, lasciando una \u003cstrong data-start=\"899\" data-end=\"914\"\u003ecavità vuota\u003c\/strong\u003e.\u003c\/p\u003e\n\n\n\u003c\/li\u003e\n\n\u003cli data-start=\"916\" data-end=\"1105\"\u003e\n\n\u003cp data-start=\"919\" data-end=\"1105\"\u003eL'interno può poi essere rivestito o riempito di \u003cstrong data-start=\"970\" data-end=\"992\"\u003ecristalli di quarzo\u003c\/strong\u003e, \u003cstrong data-start=\"994\" data-end=\"1007\"\u003efeldspato\u003c\/strong\u003e, \u003cstrong data-start=\"1009\" data-end=\"1021\"\u003ezeoliti\u003c\/strong\u003e, o altri minerali secondari derivanti dalla circolazione di fluidi idrotermali.\u003c\/p\u003e\n\n\n\u003c\/li\u003e\n\n\n\u003c\/ol\u003e\n\u003chr data-start=\"1107\" data-end=\"1110\"\u003e\n\u003ch3 data-start=\"1112\" data-end=\"1139\"\u003e🧬 \u003cstrong data-start=\"1119\" data-end=\"1139\"\u003eCaratteristiche\u003c\/strong\u003e\n\n\u003c\/h3\u003e\n\u003cul data-start=\"1140\" data-end=\"1495\"\u003e\n\n\u003cli data-start=\"1140\" data-end=\"1212\"\u003e\n\n\u003cp data-start=\"1142\" data-end=\"1212\"\u003e\u003cstrong data-start=\"1142\" data-end=\"1152\"\u003eDimensioni\u003c\/strong\u003e: da pochi millimetri a diversi centimetri di diametro.\u003c\/p\u003e\n\n\n\u003c\/li\u003e\n\n\u003cli data-start=\"1213\" data-end=\"1326\"\u003e\n\n\u003cp data-start=\"1215\" data-end=\"1326\"\u003e\u003cstrong data-start=\"1215\" data-end=\"1224\"\u003eForma\u003c\/strong\u003e: arrotondata, spesso con una \u003cstrong data-start=\"1254\" data-end=\"1280\"\u003estruttura concentrica\u003c\/strong\u003e (come gli strati di una cipolla) o \u003cstrong data-start=\"1313\" data-end=\"1325\"\u003eradiale\u003c\/strong\u003e.\u003c\/p\u003e\n\n\n\u003c\/li\u003e\n\n\u003cli data-start=\"1327\" data-end=\"1410\"\u003e\n\n\u003cp data-start=\"1329\" data-end=\"1410\"\u003e\u003cstrong data-start=\"1329\" data-end=\"1350\"\u003eMinerali presenti\u003c\/strong\u003e: quarzo, tridimite, cristobalite, ematite, zeoliti, ecc.\u003c\/p\u003e\n\n\n\u003c\/li\u003e\n\n\u003cli data-start=\"1411\" data-end=\"1495\"\u003e\n\n\u003cp data-start=\"1413\" data-end=\"1495\"\u003e\u003cstrong data-start=\"1413\" data-end=\"1423\"\u003eAspetto\u003c\/strong\u003e: talvolta spettacolari, con belle \u003cstrong data-start=\"1465\" data-end=\"1494\"\u003ecristallizzazioni interne\u003c\/strong\u003e.\u003c\/p\u003e\n\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003chr data-start=\"1497\" data-end=\"1500\"\u003e\n\u003ch3 data-start=\"1502\" data-end=\"1533\"\u003e📍 \u003cstrong data-start=\"1509\" data-end=\"1533\"\u003eDove si trovano?\u003c\/strong\u003e\n\n\u003c\/h3\u003e\n\u003cul data-start=\"1534\" data-end=\"1744\"\u003e\n\n\u003cli data-start=\"1534\" data-end=\"1614\"\u003e\n\n\u003cp data-start=\"1536\" data-end=\"1614\"\u003eNelle \u003cstrong data-start=\"1545\" data-end=\"1570\"\u003erioliti perlitiche\u003c\/strong\u003e degli Stati Uniti (Nuovo Messico, Colorado).\u003c\/p\u003e\n\n\n\u003c\/li\u003e\n\n\u003cli data-start=\"1615\" data-end=\"1656\"\u003e\n\n\u003cp data-start=\"1617\" data-end=\"1656\"\u003eIn Islanda, nelle zone vulcaniche.\u003c\/p\u003e\n\n\n\u003c\/li\u003e\n\n\u003cli data-start=\"1657\" data-end=\"1744\"\u003e\n\n\u003cp data-start=\"1659\" data-end=\"1744\"\u003eIn Francia: se ne possono osservare in alcune regioni vulcaniche del Massiccio Centrale.\u003c\/p\u003e\n\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003chr data-start=\"1746\" data-end=\"1749\"\u003e\n\u003ch3 data-start=\"1751\" data-end=\"1769\"\u003e🎨 \u003cstrong data-start=\"1758\" data-end=\"1769\"\u003eInteresse\u003c\/strong\u003e\n\n\u003c\/h3\u003e\n\u003cul data-start=\"1770\" data-end=\"2061\"\u003e\n\n\u003cli data-start=\"1770\" data-end=\"1895\"\u003e\n\n\u003cp data-start=\"1772\" data-end=\"1895\"\u003e\u003cstrong data-start=\"1772\" data-end=\"1788\"\u003eScientifico\u003c\/strong\u003e: forniscono informazioni sulle condizioni di solidificazione della lava e sui processi post-vulcanici.\u003c\/p\u003e\n\n\n\u003c\/li\u003e\n\n\u003cli data-start=\"1896\" data-end=\"2061\"\u003e\n\n\u003cp data-start=\"1898\" data-end=\"2061\"\u003e\u003cstrong data-start=\"1898\" data-end=\"1912\"\u003eEstetico\u003c\/strong\u003e: alcune litofiscie sono ricercate per la loro bellezza cristallina, talvolta utilizzate come \u003cstrong data-start=\"2008\" data-end=\"2032\"\u003eoggetti da collezione\u003c\/strong\u003e o \u003cstrong data-start=\"2036\" data-end=\"2060\"\u003epietre ornamentali\u003c\/strong\u003e.\u003c\/p\u003e\n\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e","products":[],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0808\/8577\/6732\/collections\/lithophyse-9895751.jpg?v=1779712283","url":"https:\/\/www.laboiteacailloux.com\/it\/collections\/lithophyse.oembed","provider":"La Boite à Cailloux","version":"1.0","type":"link"}