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16.37: Obsidiana

Última actualización

30 oct 2022
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- 16.36: Fluorita
- 16.38: Piedra de oro

gemology
Gemology Project

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La obsidiana (llamada así por el romano, Obsius) es un vidrio volcánico.

Diagnósticos

Color

Su color es negro, gris, marrón, verde y puede ser dorado o plateado debido a inclusiones.

Diafanidad

Transparente a opaco.

Dureza

La obsidiana tiene una dureza de 5-5 1/2.

Gravedad específica

La obsidiana tiene una densidad de 2.35-2.60.

Índice de refracción

La obsidiana es solo refractiva con un rango de I. I. de 1.45 a 1.55.

Variedades

La obsidiana copo de nieve es el nombre comercial de una obsidiana con inclusiones en forma de bola de color gris-blanco de Esferulitas que se encuentran en México y Estados Unidos.

Localidades

Los depósitos se encuentran en Estados Unidos, México, Japón, Italia, Islandia, Indonesia y Ecuador.