
<ns0:uwmetadata xmlns:ns0="http://phaidra.univie.ac.at/XML/metadata/V1.0" xmlns:ns1="http://phaidra.univie.ac.at/XML/metadata/lom/V1.0" xmlns:ns10="http://phaidra.univie.ac.at/XML/metadata/provenience/V1.0" xmlns:ns11="http://phaidra.univie.ac.at/XML/metadata/provenience/V1.0/entity" xmlns:ns12="http://phaidra.univie.ac.at/XML/metadata/digitalbook/V1.0" xmlns:ns13="http://phaidra.univie.ac.at/XML/metadata/etheses/V1.0" xmlns:ns2="http://phaidra.univie.ac.at/XML/metadata/extended/V1.0" xmlns:ns3="http://phaidra.univie.ac.at/XML/metadata/lom/V1.0/entity" xmlns:ns4="http://phaidra.univie.ac.at/XML/metadata/lom/V1.0/requirement" xmlns:ns5="http://phaidra.univie.ac.at/XML/metadata/lom/V1.0/educational" xmlns:ns6="http://phaidra.univie.ac.at/XML/metadata/lom/V1.0/annotation" xmlns:ns7="http://phaidra.univie.ac.at/XML/metadata/lom/V1.0/classification" xmlns:ns8="http://phaidra.univie.ac.at/XML/metadata/lom/V1.0/organization" xmlns:ns9="http://phaidra.univie.ac.at/XML/metadata/histkult/V1.0">
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    <ns1:title language="it">Porfido rosso scuro</ns1:title>
    <ns1:language>it</ns1:language>
    <ns1:description language="it">Lapis porphyrites (di color rosso porpora) o Pietra di porpora, denominato anche Porfido rosso antico, Leucostictos o Leucostitto (punteggiato di bianco), Tebaico (dall&apos;antica regione della Tebaide), Lithos romaion o Pietra Romana (pietra simbolo della Roma antica). 
Veniva estratto in Egitto, Red Sea Hills - Gebel Abu Dokhan (l&apos;antico Mons Porphyrites o Mons Igneus). È una roccia vulcanica, una lava a blocchi di composizione andesitico-dacitica. 
Ha struttura porfirica con fenocristalli biancastri di plagioclasio contenuti in una pasta di fondo di colore rosso vivo-violaceo. Al microscopio ottico si osserva una tessitura a blocchi con elementi lavici porfirici spigolosi o a bordo sinuoso contenuti in una matrice finemente sminuzzata. Oltre ai plagioclasi (sostituiti da albite, silice ed epidoto) sono presenti fenocristalli di anfibolo bruno, epidoti da incolori a violacei (piemontite) e minerali opachi. Diffusissima l’ematite che conferisce il colore rosso alla roccia.
</ns1:description>
    <ns1:keyword language="it">Collezione Sarti, porfido rosso, petrografia </ns1:keyword>
    <ns1:coverage language="it">Data di donazione: 1876</ns1:coverage>
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    <ns1:upload_date>2019-12-09T12:07:44.081Z</ns1:upload_date>
    <ns1:status>44</ns1:status>
    <ns2:peer_reviewed>no</ns2:peer_reviewed>
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        <ns3:firstname>Antonio</ns3:firstname>
        <ns3:lastname>Sarti</ns3:lastname>
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        <ns3:firstname>Giuseppe Maria</ns3:firstname>
        <ns3:lastname>Bargossi</ns3:lastname>
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    <ns1:contribute seq="2">
      <ns1:role>1557110</ns1:role>
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        <ns3:firstname>Giorgio</ns3:firstname>
        <ns3:lastname>Gasparotto</ns3:lastname>
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    <ns1:contribute seq="3">
      <ns1:role>1552154</ns1:role>
      <ns1:entity seq="0">
        <ns3:institution>Sistema Museale di Ateneo- Università di Bologna</ns3:institution>
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    <ns1:purpose>70</ns1:purpose>
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      <ns8:faculty>UNIBOMUSEI</ns8:faculty>
      <ns8:department>Collezione_Mineralogia_unibo</ns8:department>
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  <ns10:provenience>
    <ns10:contribute>
      <ns10:location language="it">Collezione di Mineralogia &quot;Museo Luigi Bombicci&quot;, vetrina n.11</ns10:location>
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