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The Mineral & Gemstone Ametrine
PHYSICAL PROPERTIES:
VARIETY OF: Quartz , SiO 2 , Silicon Dioxide.
CRYSTAL SYSTEM: Trigonal
COLOR: A mix of purple and yellow
USES: Gemstone and ornamental stone.
REFRACTIVE INDEX : 1.544-1.553
HARDNESS: 7
CLASS: tectosilicate
CLEAVAGE: none
FRACTURE: conchoidal
LUSTER: vitreous
STREAK: white
PLEOCHROISM: weak to distinct
SPECIFIC GRAVITY: 2.65
TRANSPARENCY: opaque to transparent
DISTINGUISHING CHARACTERISTICS:
The term Ametrine was coined for a variety of quartz in which both amethyst
and citrine occur together. The process is not fully understood, but Amatrine
is formed, when iron impurities in quartz are affected in different ways.
An example of how this could happen is if one side of the crystal was
facing a vent or other such heat source. Any change in pressure would
affect the temperature forming the citrine and amethyst would begin to
form instead.
LOCALITIES:
The colors in ametrine have been artificially produced in quartz by
irradiation and/or heating. Ametrine rarely occurs in nature. The most
well-known natural ametrine source is the Anahi mine in Bolivia.