16.22: Barita
- Page ID
- 90417
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|---|---|
| Composición química | BaSO 4 |
| Sistema de cristal | Ortorrómbico |
| Hábito | Tabular paralelo a base, fibroso, nodular a masivo |
| Escote | Escote perfecto paralelo a las caras base y prisma: {001} Perfecto, {210} Perfecto, {010} Imperfecto |
| Fractura | Irregular/desigual |
| Dureza | 3-3.5 |
| Naturaleza óptica | biaxial + |
| Índice de refracción | nα = 1.634—1.637 nβ = 1.636—1.638 nγ = 1.646—1.648 |
| Birrefringencia | 0.012 |
| Gravedad específica | 4.3—5 |
| Lustre | Vítreo a nacarado |
| Características de diagnóstico | Gravedad específica alta, escisión característica y cristales |
Figura\(\PageIndex{1}\): Barita Facetada 19.35cts.
Cortesía de Egor Gavrilenko
La barita, (BaSO 4) es un mineral que consiste en sulfato de bario. Generalmente es blanco o incoloro, y es la principal fuente de bario.
Nunca se usa en joyería debido a su dureza extremadamente baja y un escote distinto, lo que hace que sea muy difícil modelarla como una gema.
Barita (barita deletreada en publicaciones británicas) fue nombrada de la palabra griega baros que significa peso, una referencia a su gravedad específica inusualmente alta.
Ocasionalmente se puede encontrar en colecciones de gemas esotéricas como una rara curiosidad.
Figura\(\PageIndex{2}\): Cristales de Barita con Calcita, Localidad: Northumberland, Condado de Nye, NV
Colección de Barbra Voltaire