A white or grey mineral of potassium aluminum silicate, KAlSi2O6.
A mineral of silica-poor igneous, plutonic and volcanic stones. Chemically, leucite is a potassium feldspar with inadequate silica to fulfill the substance bonds. Because of the unfilled bonds, leucite weathers quickly and may simply be viewed as inclusions in newly damaged rock.
A mineral having a glassy break, happening in clear trapezohedral crystals. It is a silicate of alumina and potash KAlSi2O6. It really is found in the volcanic stones of Italy, particularly at Vesuvius.
A mineral originally based in the recent volcanic rocks of south Italy, particularly at Vesuvius, disseminated through lavas in crystals, often trapezohedrons, or in unusual masses.
A small yellowish human body based in the cotyledons of a germinating plant which has had not already been exposed to sunshine.