1. a gray or green mineral that is an alteration product of other minerals, especially cordierite
Usage: mineralogy

Examples

• The geologist identified pinite in the metamorphic rock sample.
• Pinite forms when cordierite undergoes chemical alteration.
• The gray pinite crystals were visible under the microscope.
• Pinite is commonly found in altered igneous rocks.
• The mineral collection included a specimen of green pinite.