Zealand. In the United States, in California, Utah, and at the Red Cloud Mine in Colorado.
Hessonite (See Essonite.)
Heulandite: Hydrated Silicate. Silica 60%, Alumina 17% Lime 10%. This mineral occurs in crystals, in foliated granular masses, and globular aggregates with a glassy
luster; is colorless, white, yellow, brown, pink or red. It is found in
Italy, Tyrol, Sweden, Scotland; along the north shore of Lake:
Superior, and near Baltimore, Md.
Hiddenite: A glassy, emerald-green variety of Spodumene. A semi-precious stone from Stony Point, North Carolina
Hornblende: One of the dark-green, brown or black forms of Amphibole.
Horn-Silver or An important ore of Silver, (see Cerargyrite). Cerargyrite:
Hyacinth: A
variety of Zircon, the name of which is taken from its color,
hyacinth-red, though some specimens shade to brown, and the
light-yellow ones, known as Jargoons,
in their brilliancy and fire resemble the diamond. Hyacinths of the
best color are obtained from Ceylon where they are found in stream
gravel with Sapphire, Ruby and Spinel.
Hyalite A transparent colorless variety of Opal, usually in globular or botryoidal masses.
Hydromagnesite:
Basic Magnesium Carbonate. Carbon Dioxide 36%, Magnesia 44%. Occurs in
small crystals, usually acicular or bladed and tufted, also as chalky
or mealy crusts with color and streak white. Found in Styria, Baden,
also in Texas, Hoboken, N. J., and Pennsylvania.
Hydrozincite: Basic
Zinc Carbonate. Exact composition uncertain. This mineral is a white
substance that occurs as earthy or fibrous incrustations on other zinc
compounds.
Iceland Spar: A
transparent, colorless, double-refracting variety of Calcite. This form
of Calcite has been a great servant of science, for its perfect
cleavage pieces
and strong double refraction, led Bartholinus and Huygens to the
