leucite

A white or gray mineral of potassium aluminum silicate, KAlSi₂O₆.

A mineral originally found in the recent volcanic rocks of southern Italy, especially at Vesuvius, disseminated through the lavas in crystals, usually trapezohedrons, or in irregular masses.

A small yellowish body found in the cotyledons of a germinating plant that has not been exposed to sunlight.

A mineral having a glassy fracture, occurring in translucent trapezohedral crystals. It is a silicate of alumina and potash KAlSi2O6. It is found in the volcanic rocks of Italy, especially at Vesuvius.

A leucoplast.

A mineral of silica-poor igneous, plutonic and volcanic rocks. Chemically, leucite is a potassium feldspar with insufficient silica to satisfy the chemical bonds. Because of the unfilled bonds, leucite weathers rapidly and can only be seen as inclusions in freshly broken rock.

A leucoplast.