1. of, relating to, or containing felsite; composed of fine-grained igneous rock with a glassy or cryptocrystalline texture
Usage: geology; technical

Examples

• The felsitic texture of the volcanic rock indicated rapid cooling.
• Geologists identified the felsitic composition of the sample under the microscope.
• Felsitic rocks are common in areas of ancient volcanic activity.
• The felsitic groundmass contained scattered phenocrysts of quartz.
• This felsitic lava flow cooled too quickly to form large crystals.