CHAPTER IV.—GENERAL MINERALOGY OF THE DISTRICT. 
EIST OF MINERALS. 
For convenient reference, the names of the principal mineral species known 
to occur in the Cripple Creek district are assembled in the following list, which 
contains 68 established and 8 doubtful species: 
List of minerals of the Cripple Creek district. 
Gold. 
Rutile. 
Anorthite. 
Copper. 
Limonite. 
Sodalite. 
Tellurium? 
Psilomelane. 
Nosean. 
Petzite ? 
Molybdite. 
Nepheline. 
Sylvanite. 
Usemannite. 
Analcite. 
Krennerite. 
Calcite. 
Natrolite. 
Calaverite. 
Dolomite. 
Stilbite. 
Emmonsite. 
Rhodochrosite. 
Tourmaline. 
Tellurite. 
Barite. 
Olivine. 
Pyrite. 
Celestite. 
Augite. 
Marcasite ? 
Alunite. 
Diallage. 
Molybdenite. 
Gypsum. 
.ZEgirine. 
Stibnite. 
Glockerite ? 
Hornblende. 
Cinnabar? 
Chalcanthite. 
Arfvedsonite. 
Galena. 
Mirabilite. 
Biotite. 
Zinc blende. 
Mallardite. 
Muscovite. 
Chalcopyrite. 
Epsomite. 
Roscoelite. 
Tetrahedrite. 
Apatite. 
Chlorite. 
Chalcocite? 
Wavellite. 
Serpentine. 
Fluorite. 
Titanite. 
Kaolin. 
Quartz. 
Hubnerite. 
Chrysocolla. 
Chalcedony. 
Orthoclase. 
Morencite ? 
Opal. 
Microcline. 
Chloropal ? 
Magnetite. 
Albite. 
Coal. 
Specularite. 
Oligoclase. 
Zircon. 
Labradorite. 
NOTES ON OCCURRENCE. 
NATIVE ELEMENTS. 
Gold .—Within the oxidized zone of the veins native gold is abundant, but it 
rarely exhibits its normal characteristics. It forms small particles, many of which 
are entirely invisible to the naked eye, or in a few cases larger grains, spongy masses, 
thin sheets, or plates. Occasionally elongated forms with grooved surfaces are 
found which more or less plainly show their character as pseudomorphs after calave- 
rite or other tellurides. The color is dull brownish, not unlike that of limonite, 
but the true tint and luster is quickly shown upon slight pressure with a knife. 
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