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<title>Ferridrite</title>
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<wx:section level="1" title="Ferridrite" id="wxsec1"><h1 class="pagetitle" id="wx1">Ferridrite</h1>

<wx:template id="wx_t1" pagename="Template:Minerale" page_id="42897"/>
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<p id="wx5">Ferridrite</p>
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<tr class="hiddenStructure noprint" id="wx6">
<td colspan="2" align="center" bgcolor="#FFFFFF" style="border-bottom: 1px solid #808080; border-left: 1px solid #808080; border-right: solid 1px #808080" id="wx7">
<p id="wx8">[[Immagine:|250px|]]</p>
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<tr id="wx9">
<td valign="top" width="140px" bgcolor="#EFEFEF" style="border-bottom:1px solid #808080; border-left:1px solid #808080;" id="wx10"><a href="/wit/Classificazione_Strunz" title="Classificazione Strunz" wx:linktype="known" wx:pagename="Classificazione_Strunz" wx:page_id="9395" id="wx11">Classificazione Strunz</a> </td>
<td style="border-bottom: 1px solid #808080; border-left: 1px solid #808080; border-right: solid 1px #808080;" id="wx12">
<p id="wx13">IV/F.09-20</p>
</td>
</tr>

<tr id="wx14">
<td valign="top" bgcolor="#EFEFEF" style="border-bottom: 1px solid #808080; border-left: 1px solid #808080;" id="wx15"><a href="/wit/Formula_bruta" title="Formula bruta" wx:linktype="known" wx:pagename="Formula_bruta" wx:page_id="1925" id="wx16">Formula chimica</a> </td>
<td style="border-bottom: 1px solid #808080; border-left: 1px solid #808080; border-right: solid 1px #808080;" id="wx17">
<p id="wx18">Fe<sup id="wx19">3+</sup>2O<sub id="wx20">3</sub>·0,5(H<sub id="wx21">2</sub>O)</p>
</td>
</tr>

<tr id="wx22">
<th style="font-size:110%;background:#A0FFA0; border: 1px solid #808080;" align="center" colspan="2" id="wx23">
<p id="wx24">Proprietà cristallografiche</p>
</th>
</tr>

<tr id="wx25">
<td valign="top" bgcolor="#EFEFEF" style="border-bottom: 1px solid #808080; border-left: 1px solid #808080;" id="wx26"><a href="/wit/Gruppo_cristallino" title="Gruppo cristallino" wx:linktype="known" wx:pagename="Gruppo_cristallino" wx:page_id="9399" id="wx27">Gruppo cristallino</a> </td>
<td style="border-bottom: 1px solid #808080; border-left: 1px solid #808080; border-right: solid 1px #808080;" id="wx28">
<p id="wx29">dimetrico</p>
</td>
</tr>

<tr id="wx30">
<td valign="top" bgcolor="#EFEFEF" style="border-bottom: 1px solid #808080; border-left: 1px solid #808080;" id="wx31"><a href="/wit/Sistema_cristallino" title="Sistema cristallino" wx:linktype="known" wx:pagename="Sistema_cristallino" wx:page_id="9398" id="wx32">Sistema cristallino</a> </td>
<td style="border-bottom: 1px solid #808080; border-left: 1px solid #808080; border-right: solid 1px #808080;" id="wx33">
<p id="wx34">trigonale</p>
</td>
</tr>

<tr id="wx35">
<td valign="top" bgcolor="#EFEFEF" style="border-bottom: 1px solid #808080; border-left: 1px solid #808080;" id="wx36"><a href="/wit/Classe_di_simmetria" title="Classe di simmetria" wx:linktype="known" wx:pagename="Classe_di_simmetria" wx:page_id="9463" id="wx37">Classe di simmetria</a> </td>
<td style="border-bottom: 1px solid #808080; border-left: 1px solid #808080; border-right: solid 1px #808080;" id="wx38">
<p id="wx39">esagonale-scalenoedrico</p>
</td>
</tr>

<tr id="wx40">
<td valign="top" bgcolor="EFEFEF" style="border-bottom: 1px solid #808080; border-left: 1px solid #808080;" id="wx41"><a href="/wit/Parametri_di_cella" title="Parametri di cella" wx:linktype="known" wx:pagename="Parametri_di_cella" wx:page_id="238981" id="wx42">Parametri di cella</a> </td>
<td style="border-bottom: 1px solid #808080; border-left: 1px solid #808080; border-right: solid 1px #808080;" id="wx43">
<p id="wx44">a = 2,96, c = 9,4</p>
</td>
</tr>

<tr id="wx45">
<td valign="top" bgcolor="#EFEFEF" style="border-bottom: 1px solid #808080; border-left: 1px solid #808080;" id="wx46"><a href="/wit/Gruppo_puntuale" title="Gruppo puntuale" wx:linktype="known" wx:pagename="Gruppo_puntuale" wx:page_id="224806" id="wx47">Gruppo puntuale</a> </td>
<td style="border-bottom: 1px solid #808080; border-left: 1px solid #808080; border-right: solid 1px #808080;" id="wx48"><font style="text-decoration:overline" id="wx49">3</font>
<p id="wx50">2/m</p>
</td>
</tr>

<tr id="wx51">
<td valign="top" bgcolor="#EFEFEF" style="border-bottom: 1px solid #808080; border-left: 1px solid #808080;" id="wx52"><a href="/wit/Gruppo_spaziale" title="Gruppo spaziale" wx:linktype="known" wx:pagename="Gruppo_spaziale" wx:page_id="9480" id="wx53">Gruppo spaziale</a> </td>
<td style="border-bottom: 1px solid #808080; border-left: 1px solid #808080; border-right: solid 1px #808080;" id="wx54">
<p id="wx55">P <font style="text-decoration:overline" id="wx56">3</font>1c</p>
</td>
</tr>

<tr id="wx57">
<th style="font-size:110%;background:#A0FFA0; border: 1px solid #808080;" align="center" colspan="2" id="wx58">
<p id="wx59">Proprietà fisiche</p>
</th>
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<tr id="wx60">
<td valign="top" bgcolor="#EFEFEF" style="border-bottom: 1px solid #808080; border-left: 1px solid #808080;" id="wx61">
<p id="wx62">Densità</p>
</td>
<td style="border-bottom: 1px solid #808080; border-left: 1px solid #808080; border-right: solid 1px #808080;" id="wx63">
<p id="wx64">3,8 g/cm³</p>
</td>
</tr>

<tr id="wx65">
<td valign="top" bgcolor="#EFEFEF" style="border-bottom: 1px solid #808080; border-left: 1px solid #808080;" id="wx66">
<p id="wx67">Durezza (<a href="/wit/Scala_di_Mohs" title="Scala di Mohs" wx:linktype="known" wx:pagename="Scala_di_Mohs" wx:page_id="9392" id="wx68">Mohs</a>)</p>
</td>
<td style="border-bottom: 1px solid #808080; border-left: 1px solid #808080; border-right: solid 1px #808080;" id="wx69">
<p id="wx70"> </p>
</td>
</tr>

<tr id="wx71">
<td valign="top" bgcolor="#EFEFEF" style="border-bottom: 1px solid #808080; border-left: 1px solid #808080;" id="wx72"><a href="/wit/Sfaldatura" title="Sfaldatura" wx:linktype="known" wx:pagename="Sfaldatura" wx:page_id="9481" id="wx73">Sfaldatura</a> </td>
<td style="border-bottom: 1px solid #808080; border-left: 1px solid #808080; border-right: solid 1px #808080;" id="wx74">
<p id="wx75"> </p>
</td>
</tr>

<tr id="wx76">
<td valign="top" bgcolor="#EFEFEF" style="border-bottom: 1px solid #808080; border-left: 1px solid #808080;" id="wx77"><a href="/wit/Frattura_%28mineralogia%29" title="Frattura (mineralogia)" wx:linktype="known" wx:pagename="Frattura_(mineralogia)" wx:page_id="9482" id="wx78">Frattura</a> </td>
<td style="border-bottom: 1px solid #808080; border-left: 1px solid #808080; border-right: solid 1px #808080;" id="wx79">
<p id="wx80"> </p>
</td>
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<tr id="wx81">
<td valign="top" bgcolor="#EFEFEF" style="border-bottom: 1px solid #808080; border-left: 1px solid #808080;" id="wx82">
<p id="wx83">Colore</p>
</td>
<td style="border-bottom: 1px solid #808080; border-left: 1px solid #808080; border-right: solid 1px #808080;" id="wx84">
<p id="wx85">giallo bruno, marrone scuro</p>
</td>
</tr>

<tr id="wx86">
<td valign="top" bgcolor="#EFEFEF" style="border-bottom: 1px solid #808080; border-left: 1px solid #808080;" id="wx87">
<p id="wx88">Lucentezza</p>
</td>
<td style="border-bottom: 1px solid #808080; border-left: 1px solid #808080; border-right: solid 1px #808080;" id="wx89">
<p id="wx90"> </p>
</td>
</tr>

<tr id="wx91">
<td valign="top" bgcolor="#EFEFEF" style="border-bottom: 1px solid #808080; border-left: 1px solid #808080;" id="wx92">
<p id="wx93">Opacità</p>
</td>
<td style="border-bottom: 1px solid #808080; border-left: 1px solid #808080; border-right: solid 1px #808080;" id="wx94">
<p id="wx95"> </p>
</td>
</tr>

<tr id="wx96">
<td valign="top" bgcolor="#EFEFEF" style="border-bottom: 1px solid #808080; border-left: 1px solid #808080;" id="wx97">
<p id="wx98">Striscio</p>
</td>
<td style="border-bottom: 1px solid #808080; border-left: 1px solid #808080; border-right: solid 1px #808080;" id="wx99">
<p id="wx100">bruno giallastri</p>
</td>
</tr>

<tr id="wx101">
<td valign="top" bgcolor="#EFEFEF" style="border-bottom: 1px solid #808080; border-left: 1px solid #808080;" id="wx102">
<p id="wx103">Diffusione</p>
</td>
<td style="border-bottom: 1px solid #808080; border-left: 1px solid #808080; border-right: solid 1px #808080;" id="wx104">
<p id="wx105"> </p>
</td>
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<tr id="wx106">
<td colspan="2" style="border: 0px" id="wx107">
<center id="wx108"><small id="wx109">Si invita a seguire lo schema di <a href="/wit/Wikipedia:Schede/Minerali" title="Wikipedia:Schede/Minerali" wx:linktype="known" wx:pagename="Wikipedia:Schede/Minerali" id="wx110">Wikischeda Minerali</a></small></center>
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<wx:templateend start="wx_t1"/>
<p id="wx111">La <b id="wx112">ferridrite</b> è un minerale, un ossi-idrossido di ferro presente in molte parti del mondo. Ha varie applicazioni industriali<sup id="_ref-0" class="reference"><a href="#_note-0" title="" wx:fragment="_note-0" wx:linktype="note" id="wx113"/></sup> <sup id="_ref-1" class="reference"><a href="#_note-1" title="" wx:fragment="_note-1" wx:linktype="note" id="wx114"/></sup> e può trovarsi anche all'interno degli organismi viventi, compreso l'uomo<sup id="_ref-2" class="reference"><a href="#_note-2" title="" wx:fragment="_note-2" wx:linktype="note" id="wx115"/></sup>.</p>

<div id="wx_toc"/>

<a id="Abito_cristallino" name="Abito_cristallino"/>
<wx:section level="2" title="Abito cristallino" id="wxsec2"><h2 id="wx116">Abito cristallino</h2>

<a id="Origine_e_giacitura" name="Origine_e_giacitura"/>
</wx:section><wx:section level="2" title="Origine e giacitura" id="wxsec3"><h2 id="wx117">Origine e giacitura</h2>

<p id="wx118">Si rinviene nel terreno e nell'acqua<sup id="_ref-3" class="reference"><a href="#_note-3" title="" wx:fragment="_note-3" wx:linktype="note" id="wx119"/></sup>.</p>

<a id="Forma_in_cui_si_presenta_in_natura" name="Forma_in_cui_si_presenta_in_natura"/>
</wx:section><wx:section level="2" title="Forma in cui si presenta in natura" id="wxsec4"><h2 id="wx120">Forma in cui si presenta in natura</h2>

<p id="wx121">La ferridrite è conosciuta solo sotto forma di tracce, in piccoli cristalli visibili solo al microscopio e, anche se la sua classificazione da parte dell'<a href="/wit/IMA" title="IMA" wx:linktype="known" wx:pagename="IMA" wx:page_id="883222" id="wx122">IMA</a> risale al <a href="/wit/1971" title="1971" wx:linktype="known" wx:pagename="1971" wx:page_id="4712" id="wx123">1971</a>, quale sia la sua struttura è ancora oggetto di dibattito.</p>

<a id="Riferimenti" name="Riferimenti"/>
</wx:section><wx:section level="2" title="Riferimenti" id="wxsec5"><h2 id="wx124">Riferimenti</h2>

<ol class="references" id="wx125">
<li id="_note-0"><a href="#_ref-0" title="" wx:fragment="_ref-0" wx:linktype="noteref" id="wx126"><b id="wx127">^</b></a>
<p id="wx128">G. P. Huffman et al., Energy Fuels 7, 285 (1993).</p>
</li>

<li id="_note-1"><a href="#_ref-1" title="" wx:fragment="_ref-1" wx:linktype="noteref" id="wx129"><b id="wx130">^</b></a>
<p id="wx131">P. A. Riveros, J. E. Dutrizac, P. Spencer, Can. Metall. Q. 40, 395 (2001).</p>
</li>

<li id="_note-2"><a href="#_ref-2" title="" wx:fragment="_ref-2" wx:linktype="noteref" id="wx132"><b id="wx133">^</b></a>
<p id="wx134">A. Lewin, G. R. Moore, N. E. Le Brun, Dalton Trans. 2005, 3597 (2005).</p>
</li>

<li id="_note-3"><a href="#_ref-3" title="" wx:fragment="_ref-3" wx:linktype="noteref" id="wx135"><b id="wx136">^</b></a>
<p id="wx137">U. Schwertmann, L. Carlson, E. Murad, Clays Clay Miner.35, 297 (1987)</p>
</li>
</ol>

<a id="Collegamenti_esterni" name="Collegamenti_esterni"/>
</wx:section><wx:section level="2" title="Collegamenti esterni" id="wxsec6"><h2 id="wx138">Collegamenti esterni</h2>

<ul id="wx139">
<li id="wx140"><wx:template id="wx_t2" pagename="Template:En" page_id="121878"/>
<p id="wx141">(<span style="font-weight:bolder; font-size:80%" id="wx142"><a href="/wit/Lingua_inglese" title="Lingua inglese" wx:linktype="known" wx:pagename="Lingua_inglese" wx:page_id="2523" id="wx143">EN</a></span>) <wx:templateend start="wx_t2"/> <a href="http://webmineral.com/data/Ferrihydrite.shtml" class="external text" wx:linktype="external" rel="nofollow" id="wx144">Webmin</a></p>
</li>
</ul>
</wx:section></wx:section></div>
<div id="wx_categorylinks">
<a href="/wit/index.php?title=Speciale:Categories&amp;article=Ferridrite" title="Speciale:Categories" wx:linktype="known" wx:pagename="Speciale:Categories" id="wx145">Categoria</a>: <span dir="ltr" id="wx146"><a href="/wit/Categoria:Ossidi_e_idrossidi" title="Categoria:Ossidi e idrossidi" wx:linktype="known" wx:pagename="Categoria:Ossidi_e_idrossidi" wx:page_id="306539" id="wx147">Ossidi e idrossidi</a></span></div>
<div id="wx_languagelinks">
Altre lingue: <a href="http://en.wikipedia.org/wiki/Ferrihydrite" class="external" wx:linktype="interwiki" wx:pagename="en:Ferrihydrite" id="wx148">English</a></div>
</body>
<wx:templatearguments for="wx_t1"><wx:argument name="nomeminerale">
<p id="wx149">Ferridrite</p>
</wx:argument><wx:argument name="immagine"/><wx:argument name="classificazione">
<p id="wx150">IV/F.09-20</p>
</wx:argument><wx:argument name="formula">
<p id="wx151">Fe<sup id="wx152">3+</sup>2O<sub id="wx153">3</sub>·0,5(H<sub id="wx154">2</sub>O)</p>
</wx:argument><wx:argument name="gruppo">
<p id="wx155">dimetrico</p>
</wx:argument><wx:argument name="sistema">
<p id="wx156">trigonale</p>
</wx:argument><wx:argument name="classe">
<p id="wx157">esagonale-scalenoedrico</p>
</wx:argument><wx:argument name="parametri">
<p id="wx158">a = 2,96, c = 9,4</p>
</wx:argument><wx:argument name="puntuale">
<font style="text-decoration:overline" id="wx159">3</font>
<p id="wx160">2/m</p>
</wx:argument><wx:argument name="spaziale">
<p id="wx161">P <font style="text-decoration:overline" id="wx162">3</font>1c</p>
</wx:argument><wx:argument name="valoredensita">
<p id="wx163">3,8</p>
</wx:argument><wx:argument name="valoredurezza">
<p id="wx164"> </p>
</wx:argument><wx:argument name="tiposfaldatura">
<p id="wx165"> </p>
</wx:argument><wx:argument name="tipofrattura">
<p id="wx166"> </p>
</wx:argument><wx:argument name="coloreminerale">
<p id="wx167">giallo bruno, marrone scuro</p>
</wx:argument><wx:argument name="tipolucentezza">
<p id="wx168"> </p>
</wx:argument><wx:argument name="tipoopacita">
<p id="wx169"> </p>
</wx:argument><wx:argument name="coloreriflessi">
<p id="wx170">bruno giallastri</p>
</wx:argument><wx:argument name="tipodiffusione">
<p id="wx171"> </p>
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