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16.5.4: Prasiolita

Última actualización

30 oct 2022
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- 16.5.3: Citrina
- 16.5.5: Cristal de Roca

gemology
Gemology Project

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Prasiolita
Composición química	SiO ₂ Dióxido de silicio
Sistema de cristal	Trigonal
Hábito	Prismático
Escote	Pobre
Fractura	Concoidal
Dureza	7
Naturaleza óptica	Uniaxial +
Índice de refracción	1.544 - 1.553
Birrefringencia	0.009
Dispersión	0.013
Gravedad específica	2.63 - 2.65
Lustre	Vítreo
Pleochoísmo	Débil a fuerte

Archivo:Verde quartz.jpg

Figura $\PageIndex{1}$ : Brasil

La prasiolita es la variedad verde del cuarzo.
El color es causado por el calentamiento de amatista natural (por exposición a la luz solar o artificial) o por tratamiento térmico artificial de amatista irradiada. El primero le dará un color verde más estable que es menos propenso a la decoloración.

Sinónimos: Prasiolita, amatista verde, cuarzo verde.
Nombres inadecuados: Amatista verde.

El nombre “prasiolita” no debe confundirse con prasolita (una variedad verde del grupo clorito) y praseolita que es la variedad verde de cordierita.

Diagnóstico

Filtro de color Chelsea

Reacciones bajo luz incandescente:

Cuarzo verde irradiado: rojo.
Cuarzo verde tratado térmicamente: verde.

Diagnóstico

Filtro de color Chelsea

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