Bigwoodite
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A variety of alkali feldspar syenite consisting essentially of orthoclase, microcline and albite with traces of foids and sodic pyroxene and/or amphibole.
Classification of Bigwoodite
Alkali-felddspar-syenite is in section 6 of the QAPF diagram.
Mineralogy of Bigwoodite
Essential minerals - these are minerals that are required within the classification of this rock:
| Feldspar > Alkali Feldspar > Albite | Na(AlSi3O8) |
| Feldspar > Alkali Feldspar > Microcline | K(AlSi3O8) |
| Feldspar > Alkali Feldspar > Orthoclase | K(AlSi3O8) |
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
| Alkali pyroxene | A petrological name for the sodium-rich pyroxenes aegirine and aegirine-augite. |
| Amphibole | AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| Feldspathoid | A family of rock-forming minerals consisting of aluminosilicates of sodium, potassium, or calcium and having too ... |
References for Bigwoodite
Reference List:
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Le Maitre (ed.) (2002) Igneous Rocks - A Classification and Glossary of Terms. Cambridge Press
Internet Links for Bigwoodite
mindat.org URL:
https://www.mindat.org/min-51022.html
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