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Glossary of Minerals Terms
beginning with letter L
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labradorite Tweet Definition of labradorite Like Definition of labradorite on Facebook
noun (plural:labradorites)
  1. (mineralogy) A plagioclase feldspar, the fourth member of the Albite-Anorthite solid solution series. Often very coarsely crystalline, it is used as a decorative stone for carvings and building faí§ades. Crystal surfaces often show a bluish reflection called "Schiller", which resembles the reflections from a butterfly's wing.
  • Chemical composition: Calcium sodium aluminum silicate, <math>Ca_xNa_xAlSi_3O_8</math>
  • Physical properties:
    Moh's Hardness: 6.0
    Specific gravity: 2.71
    Color: Usually bluish-gray to dark gray
    Luster: glassy
    Fracture: conchoidal
    Cleavage: two good at about 94º to each other
  • Habit: Triclinic - pinacoidal. Crystals are common and usually striated.
lamina Tweet Definition of lamina Like Definition of lamina on Facebook
noun (pl1=laminaspl2=laminae)
  1. (anatomy) A thin plate or scale, such as the arch of a vertebra.
  2. (botany) The flat part of a leaf or leaflet; the blade.
langbeinite Tweet Definition of langbeinite Like Definition of langbeinite on Facebook
noun
  1. (mineralogy) a saline evaporite, consisting of a mixed potassium and magnesium sulphate
laumontite Tweet Definition of laumontite Like Definition of laumontite on Facebook
noun
  1. (mineralogy) A mineral, of a white color and vitreous luster. It is a hydrous silicate of alumina and lime. Exposed to the air, it loses water, becomes opaque, and crumbles.
lazurite Tweet Definition of lazurite Like Definition of lazurite on Facebook
nounLazurite
  1. (mineralogy) A mineral of metamorphosed limestones. Lazurite forms the gemstone lapis lazuli, and crushed lazurite provided the ultramarine color in artists' paint of the old masters. sodalite and lazurite form the sodalite group of silicate minerals.
  • Chemical composition: Sodium aluminum silicate with sulphur, <math>Na_{4-5}Al_3Si_3O_{12}S</math>
leucite Tweet Definition of leucite Like Definition of leucite on Facebook
noun
  1. (mineralogy) 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.
  • Chemical composition: Potassium aluminum subsilicate, <math>KAlSi?_2O_6</math>
  • Physical properties:
    Moh's Hardness: 5.5-6.0
    Specific gravity: 2.4-2.5
    Color: Gray to white to colorless
    Luster: Glassy, but rapidly weathers to a dull surface
    Fracture: Conchoidal
    Cleavage: Imperfect dodecahedral
  • Habit: Tetragonal-trapezohedral (pseudo-isometric)
limonite Tweet Definition of limonite Like Definition of limonite on Facebook
noun
  1. (mineralogy) any of several natural hydrous iron oxides; often a mixture of goethite and hemite with clays and manganese oxide
loadstone Tweet Definition of loadstone Like Definition of loadstone on Facebook
noun
  1. (context, archaic) A magnet, iron oxide in the form of w:magnetite, magnetite.
lodestone Tweet Definition of lodestone Like Definition of lodestone on Facebook
noun
  1. A naturally occuring magnet.
  2. An obsolete term for the mineral magnetite.
luster Tweet Definition of luster Like Definition of luster on Facebook
noun
  1. (alternative spelling of, lustre) shine, Shine, polish, or sparkle.
He polished the brass doorknob to a high .
  1. By extension, interest, attractiveness, or splendor.
After so many years in the same field, the job had lost its .
  1. Refinement, polish, or quality.
    He spoke with all the lustre a seasoned enthusiast should have.
  2. A period of five years, from the Latin word lustrum

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