Petrographical Tables: An Aid to the Microscopical Determination of Rock-Forming Minerals (Classic Reprint) - Hardcover

Inhaltsangabe

Excerpt from Petrographical Tables: An Aid to the Microscopical Determination of Rock-Forming Minerals

The mean index of refraction is n 2 E denotes the apparent optic axial angle, or angle between the Optic axes measured in air.

The expression p v (under the head of dispersion) indicates that the Optic axial angle for red rays is smaller than that for violet p v that it is greater)

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