Cookeite On Quartz, Stand On Your Head Claim # 1, Salinâ€¦

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COOKEIT AUF QUARZ, STAND ON YOUR HEAD CLAIM # 1, SALINE COUNTY, ARKANSAS, USA (Miniatur)

641-23

$295.00

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Cookeit ist ein extrem seltenes Mineral, das zur Silikatgruppe und insbesondere zur Phyllosubgruppe gehört, klassifiziert innerhalb der Chloritfamilie, mit der chemischen Formel LiAl4(Si3Al)O10(OH)8. Dieses weiche Mineral mit geringer Dichte weist eine Reihe von Farben auf und besitzt eine kristalline Struktur, die aus abwechselnden Schichten von LiAl2(OH)6 und Al2O4(OH)2Si8O12 besteht, die in mehreren Polytypen existieren können. Typischerweise entsteht Cookeit durch die hydrothermale Alteration von Silikaten, die in Pegmatiten vorkommen, bei relativ niedrigen Temperaturen, im Allgemeinen unter 200 °C, und unter variablen Druckbedingungen.

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