from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A white or gray mineral of potassium aluminum silicate, KAlSi2O6.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. 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.
- n. A leucoplast.
from the GNU version of the Collaborative International Dictionary of English
- n. 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.
- n. A leucoplast.
from The Century Dictionary and Cyclopedia
- n. 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.
- n. A small yellowish body found in the cotyledons of a germinating plant that has not been exposed to sunlight.
As regards Kaiser Wilhelm Land, the Gaussberg is a volcanic cone mainly composed of leucite-basalt, but its slopes are strewn with erratics presumably transported from the south and these include gneiss, mica-schist and quartzite, apparently Archaean.
These include the cesium - and potassium-rich zeolites, pollucite and leucite, and the lithium-rich mica, zinnwaldite (a variety of the mineral lepidolite).
These machines are about six feet high in the whole, made of a rough gray volcanic stone, full of large crystals of leucite.
Dürkheim; it is also found in lepidolite, leucite, petalite, triphylline and in the carnallite from Stassfurt.
The flows from Kibo include nepheline and leucite basanite lavas rich in soda felspars.
Several days might be profitably spent by the antiquarian in investigating the contents of the different tiers of galleries; while the geologist would find matter for interesting speculation in the partial intrusion of the older lithoid tufa here and there into the softer and more recent volcanic deposits in which the passages are excavated, and in which numerous decomposing crystals of leucite may be observed.
Minor amounts have been extracted in Utah from the mineral alunite (a sulphate of potassium and aluminum), in Wyoming from leucite (a potassium-aluminum silicate), in
Various potassium silicates -- leucite, feldspar, sericite, and glauconite -- and the potassium sulphate, alunite, have received attention and certain of them have been utilized to a small extent, but none of them are normally able to compete on the market.
Nepheline, leucite, idocrase, and meionite have not yet been seen at the peak of
Notwithstanding the great number of blocks, which we stopped to break, to the great regret of our guides, we could discover neither nepheline, leucite, * nor feldspar.