16.21: Azurita
- Page ID
- 90517
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|---|---|
| Composición química | Cu 3 (CO 3) 2 (OH) 2 |
| Sistema de cristal | Monocínicos |
| Hábito | Columlar corto, botrioidal |
| Escote | Indistinto |
| Fractura | Concoidal, desigual, quebradizo |
| Dureza | 3 1/2 - 4 |
| Naturaleza óptica | Biaxial + |
| Índice de refracción | 1.720-1.848 |
| Birrefringencia | 0.108-0.110 |
| Gravedad específica | 3.7-3.9 |
| Lustre | Vítreo |
| Pleocroísmo | Azul claro, azul oscuro |
Figura\(\PageIndex{1}\): Azurita Botryoidal
Bisbee, Arizona
La azurita se forma directamente de la oxidación del mineral de cobre. Azurita (azul) y malaquita (verde) a menudo se encuentran juntas porque la azurita tiende a alterarse en malaquita. Debido al intenso color azul de la azurita, alguna vez se usó como pigmento para pinturas al óleo. Desafortunadamente, el tiempo ha provocado que esos cielos originalmente azules y cuerpos de agua se vuelvan decididamente verdes. En el antiguo Egipto, la pintura azurita era utilizada por los sacerdotes del templo para pintar y decorar el Tercer Ojo en sus frentes creyendo que aumentaba sus poderes. Los antiguos chinos veneraban a la azurita como la Piedra del Cielo, capaz de abrir puertas espirituales.
Localidades
- cristales azul oscuro casi negros han venido de Tsumbed (Namibia) y Marruecos
- Australia (Queensland), Chile, México, Rusia (Ural) y Estados Unidos (Arizona, Nuevo México)
Fuentes
- Piedras preciosas del mundo - Walter Schumann