Minerals in rock sections

INTRODUCTORY OPTICS FOR OPTICAL MINERALOGY. Ordinary Light.—Plane Polarized Light.—Effects Produced by Crystal Sections on Transmitted Light.—Amorphous Bodies.—Isotropic Crystal...

INVESTIGATION OF MICROSCOPIC AND OPTICAL CHARACTERS OF MINERALS. Opaque Minerals. Transparent Minerals: With transmitted light: _Form_, _Color_, _Index of Refraction and Relief_...

CHEMICAL AND MECHANICAL TESTS. Chemical Tests on Crystal in Section: _Carbonates_, _Gelatinizing Silica_.—Etched Figures.—Heating Section to Redness.—Methods of Isolating Crysta...

The object of this introduction is merely to give a practical discussion of elementary optics, as applied to optical mineralogy,[3] and no elaborate discussion of this important...

The _petrographical microscope_ is essentially an ordinary microscope[17] with the following important additional equipment. It must be provided with: 1° a _polarizer_ (a piece...

When the metallic minerals of a rock specimen are distinctly seen with the unaided eye, it is rarely necessary to make a section for their determination, as this can more easily...

▄Usual Appearance in Sections▄: Colorless patches, incrustations or veins, also at times with sphærulitic structure (hyalite), showing interference cross, of negative character,...

The methods described will be those used in making rock sections. The general principles involved are the same for both rock and crystal sections; although more difficulties are...

These tests may be necessary to confirm an optical determination or to assist in the differentiation of the closely related species of a group, as for example, the different pla...