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Umptekite

A rock subtype
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A variety of alkali-feldspar-syenite consisting of microperthite, arfvedsonite, aegirine and, sometimes, nepheline.


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Unique IdentifiersHide

Mindat ID:
52100
Long-form identifier:
mindat:1:1:52100:4

Classification of UmptekiteHide

Mineralogy of UmptekiteHide

Essential minerals - these are minerals that are required within the classification of this rock:
Amphibole > ArfvedsoniteNaNa2(Fe2+4Fe3+)Si8O22(OH)2
Feldspar > Alkali FeldsparA subgroup of the Feldspar Group, poor in calcium, and mostly rich in potassium.
MicroperthiteA microscopic intergrowth of albite or other plagioclase and orthoclase or microcline.
Pyroxene > Clinopyroxene > AegirineNaFe3+Si2O6
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
Feldspathoid > NephelineNa3K(Al4Si4O16)

Internet Links for UmptekiteHide

References for UmptekiteHide

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