Lead: A
soft malleable metal, easily fused, and when freshly broken has a
bluish color, otherwise the color is lead-gray or black. It is used
extensively for water-pipes, bullets, shot,
etc., and in alloys as pewter and type-metal. The lead ores are
are Galena, Cerussite, Pyromorphite, Mimetite, Crocoite and
Wulfenite.
Lepidokrokit or A scaly-fibrous, or feathery-columnar variety of Lepidocrocit: Goethite. Color liver-brown to blackish-brown.
Lepidolite: Lithia
Mica, a variety of Muscovite. It occurs almost exclusively as
aggregates of thin plates with hexagonal outlines; in crystals it is
very poorly developed Color rose-red. violet-gray or lilac, yellowish,
greenish or white. The rose and violet varieties contain a little
manganese. It occurs in nearly all districts producing tin and the gem,
Tourmaline; Russia, Bohemia, Saxony; in large quantities in Western
Maine; in South Dakota and Pala, California.
Lepidolite
is utilized to a slight extent in the manufacture of Lithium compounds
which are employed in the preparation of Lithia waters, medicinal
compounds, etc. The salts are used in photography and in the
manufacture of fireworks and storage-batteries.
Lepidomelane:
Magnesium Iron Mica. Occurs in small six-sided tables or an aggregate
of minute scales; sometimes in crystals. Color black with an occasional
leek-green reflection. Chiefly characterized by the large amount of
ferric iron.
Leucite: A
metasilicate of Aluminium and Potassium. This mineral occurs almost
exclusively in what apparently are simple isometric crystals, but which
are actually poly-synthetic twins of a double refracting substance.
Color white, ash-gray, or smoke-gray. It is used as a source of potash
and occurs m the lavas of Vesuvius, in Italy, Brazil, and in Wyoming, U. S. A.
Leucophanite: Silicate.
Occurs in crystals and in massive forms. Color whitish-green,
deep-green or wine-yellow. It is found in Norway, and is strongly
phosphorescent
with a bluish light when struck.
Libethenite: A Copper
mineral containing 66.4% Cupric Oxide. It occurs in compact or globular
masses and in small crystals, is a very brittle, dark green or
olive-green
in color, and is transparent or translucent. It occurs in many locali-
