Answer:
Igneous rock usually appears with a well mixed texture without fossils, bands or layers, may contain vesicles (air bubbles or holes from trapped gases) and does not react with dilute acid.
Igneous rocks can:
Be glassy or frothy in appearance.
Be felsic, intermediate, mafic, or ultramafic in nature.
Be porous or full of bubbles.
Have large crystal structure like granites.
Have small crystal structure like basalts.
Have a combination of large and small interlocked crystals.
Be more dense than other rock types.
Have an interlocking crystalline structure.
Appear to be peppered with black specks.
Be light enough to float (pumice).
Igneous rocks run the gamut from white to black, glassy to coarse-grained.