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Plagioklas - Versionshistorik
2026-06-24T16:29:22Z
Versionshistorik för denna sida på wikin
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https://wiki.guldforum.se/w/index.php?title=Plagioklas&diff=11978&oldid=prev
Dan Olsson den 28 februari 2013 kl. 00.24
2013-02-28T00:24:07Z
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Äldre version</td>
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Versionen från 27 februari 2013 kl. 20.24</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Kategori:Silikatmineral]]</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Kategori:Silikatmineral]]</div></td></tr>
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<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">[[ar:بلاغيوكلاس]]</del></div></td><td colspan="2" class="diff-side-added"></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">[[ca:Plagioclasa]]</del></div></td><td colspan="2" class="diff-side-added"></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">[[cs:Plagioklas]]</del></div></td><td colspan="2" class="diff-side-added"></td></tr>
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Dan Olsson
https://wiki.guldforum.se/w/index.php?title=Plagioklas&diff=11180&oldid=prev
Dan Olsson: 1 version
2013-02-25T23:36:35Z
<p>1 version</p>
<p><b>Ny sida</b></p><div>'''Plagioklas''' är ett samlingsnamn för en grupp [[fältspat]]er som består av albit, natriumaluminiumsilikat (NaAlSi<sub>3</sub>O<sub>8</sub>) och anortit, kalciumaluminiumsilikat (CaAl<sub>2</sub>Si<sub>2</sub>O<sub>8</sub>) vilka är helt lösliga i varandra och samkristalliserar ([[triklint kristallsystem]]). Man har delat in plagioklasmineralen i sex grupper beroende på halten anortit. <br />
*[[Albit]] (0-10% anortit) <br />
*[[Oligoklas]] (10-30% anortit)<br />
*[[Andesin]] (30-50% anortit)<br />
*[[Labradorit]] (50-70% anortit)<br />
*[[Bytownit]] (70-90% anortit)<br />
*[[Anortit]] (90-100% anortit) <br />
<br />
Densiteten varierar mellan 2,63 g/cm<sup>3</sup> för ren albit och 2,75 g/cm<sup>3</sup> för ren anortit. Färgen är vanligen vit eller transparent (färglös), men inneslutningar kan göra att mineralet på avstånd ser mörkt ut. Spaltbarheten är mycket god utefter två ytor, så att spaltstyckena får två 94°- och två 86°-vinklar. Tvillinglameller syns i mikroskop som raka streck från korngräns till korngräns. Hårdheten är 6-6,5 enligt [[Mohs hårdhetsskala]]. Plagioklaser är mindre stabila än [[ortoklas]]er och [[mikroklin]], och vittrar lättare ju höger andel anortit de innehåller. Omvandlingsprodukter är lermineralen [[montmorillonit]], [[skapolit]] och [[prehnit]]. <br />
<br />
==Källor==<br />
*Erich Spicar: Mineral och bergarter, Ica bokförlag 1995. ISBN 91-534-1385-7, ss. 90 ff.<br />
<br />
==Se även==<br />
{{Commons|Category:Plagioclase}}<br />
<br />
[[Kategori:Silikatmineral]]<br />
<br />
[[ar:بلاغيوكلاس]]<br />
[[ca:Plagioclasa]]<br />
[[cs:Plagioklas]]<br />
[[de:Feldspat#Plagioklase]]<br />
[[et:Plagioklass]]<br />
[[en:Plagioclase]]<br />
[[es:Plagioclasa]]<br />
[[eu:Plagioklasa]]<br />
[[fa:پلاژیوکلازها]]<br />
[[fr:Plagioclase]]<br />
[[gl:Plaxioclasio]]<br />
[[ko:사장석]]<br />
[[is:Plagíóklas]]<br />
[[it:Plagioclasio]]<br />
[[he:פלגיוקלז]]<br />
[[lt:Plagioklazas]]<br />
[[hu:Plagioklászok]]<br />
[[nl:Plagioklaas]]<br />
[[no:Plagioklas]]<br />
[[pl:Plagioklazy]]<br />
[[pt:Plagioclase]]<br />
[[ru:Плагиоклаз]]<br />
[[sk:Plagioklas]]<br />
[[sl:Plagioklaz]]<br />
[[sr:Плагиоклас]]<br />
[[sh:Plagioklas]]<br />
[[fi:Plagioklaasi]]<br />
[[uk:Плагіоклаз]]<br />
[[vi:Plagioclase]]<br />
[[zh:斜长石]]</div>
Dan Olsson