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16.6.1: Calcedonia

Última actualización

30 oct 2022
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- 16.06: Cuarzo - Policristalino
- 16.6.1.1: Ágata

gemology
Gemology Project

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Calcedonia
Composición química	Dióxido de silicio SiO ₂
Sistema de cristal	Trigonal
Hábito	Agregado
Fractura	Concoidal
Dureza	6.5-7
Índice de refracción	1.535 - 1.539
Gravedad específica	2.60
Lustre	Vítreo

La calcedonia es cuarzo microcristalino (criptocristalino). El nombre se usa a menudo para abarcar todas las variedades de cuarzo microcristalino como jaspe, cornalina, crisoprasa y piedras de sangre. El mineral es muy abundante y se encuentra en todo el mundo. La variedad más común es un tono gris azulado silenciado (sin nombre) que se encuentra en geodas y vugs.

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