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Spyglass is a soft black with a mostly matte finish. It was densely-pressed into the pan, which resulted in a thinner, drier, and stiffer formula. It had buildable pigmentation from mostly opaque to opaque, but it was harder to blend it out. I'd recommend using a light hand and really building up as this made blending more foolproof. It stayed on well for eight hours before fading a bit.
FURTHER READING: Formula Overview, which is a detailed review of the range as a whole.
Looking for something similar or to see what you have in your stash? Here are some of the top dupes for this shade!
Highly pigmented shadow that applies evenly and feels ultra-velvety and silky. This long wearing formula contains a unique combination of softer powders which adheres easily to the eyes, gives a soft focus effect, and blends smoothly and evenly.