Ametrine

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Refractive Index : 1.553 – 1.544

Optical Characteristic : DR U+ , AGG

Specific Gravity : 2.651 (+0.04 – 0.01)

Formula : SiO2

Crystal System : Trigonal

Variety/Species : Ametrine

Species/Group : Quartz

Birefringence : 0.009

Dispersion : 0.013

Hardness : 7

Toughness : Good

Ultrasonic : Usually Safe

Steam : Risky

UV Long : Inert to Weak

UV Short : Inert to Weak

Pleochroism : 2 Colors

Strength : Weak to Moderate

Pleochroism Colors : Weak to moderate : Purple/ reddish purple, Very weak : Different shades of yellow or orange

Heat : Avoid heating

Acids : Avoid hydrofluoric acid

Light : Some may fade

Polish Luster : Vitreous

Fracture : Conchoidal

Fracture Luster : Vitreous

Clarity Type : II

Tones : 2-8

Saturations : 1-5

Cause of Color : Color centers involving iron impurities and irradiation

Enhancements : Heating

Cleavage : None

Color Range : Purple, violet, bluish purple, yellow, orangy yellow, orange, brownish orange, yellowish orange purplish, violetish, yellowish, reddish, orangy, brownish

Transparency : Transparent

Phenomena : None

Separations : Ametrine from-
Has a unique appearance with both colors of amethyst and citrine in the same crystal.

This makes it unlikely to be confused with another gemstone.

Identifying Characteristics and information
Color zoning, twinning, two-phase inclusions, negative crystals three-phase inclusions, may show bulls eye or Airys spiral optic fiqure.

Has a unique appearance with both colors of amethyst and citrine.

Spectral Data
Not Diagnostic.

Trade Names and Misnomers
Amethyst-Citrine
Ametrine
Citrine-Amethyst

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