If a piece of Michigan nepheline syenite lacks fluorescent sodalite, what is it correctly identified as?
Answer
Simply syenite (or local nepheline syenite)
If the defining feature—the fluorescent sodalite—is absent, the rock is considered a piece of local nepheline syenite but does not carry the popular 'Yooperlite' designation.
Related Questions
What geological classification is Yooperlite considered a specific, recognizable variety of?What unique physical property elevates a nepheline syenite to the trade designation Yooperlite?Which specific mineral is responsible for the bright orange or reddish glow observed in Yooperlite under UV light?How does typical syenite primarily differ structurally from granite?What specific type of syenite are Yooperlites classified as based on their mineral makeup?According to the text, what kind of name is 'Yooperlite'?What essential tool is required for the initial successful identification of Yooperlite in the field?What color does the sodalite in Yooperlite typically flash when exposed to the correct UV light wavelength?The presence of nepheline in Yooperlite suggests it formed from magmas relatively low in what component?If a piece of Michigan nepheline syenite lacks fluorescent sodalite, what is it correctly identified as?What mineral generally dominates the composition of a typical syenite rock?