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Bi-color Kunzite Crystal 5

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Original price $500
Current price $450

Big bi-color Kunzite Crystal with clear and nice color.

Dimensions (length, width, height): 6.4cm x 2.1cm x 17.2cm

Weight: 388 grams

Origin: Peech valley, Kunar, Afghanistan.

Color:  Green & Purple


Green & Purple Crystal with big size and nice clear color.

 

 

KUNZITE:

Kunzite is a pink to lilac colored gemstone, a variety of spodumene with the color coming from minor to trace amounts of manganese. Some (but not all) kunzite used for gemstones has been heated to enhance its color. It is also frequently irradiated to enhance the color.

Kunzite was discovered in 1902, and was named after George Frederick Kunz, Tiffany & Co's chief jeweler at the time, and a noted mineralogist. It has been found in Brazil, US, Canada, CIS, Mexico, Sweden, Western Australia, Afghanistan and Pakistan.

One notable example of kunzite used in jewellery is in the Russian Palmette tiara and necklace worn by the Duchess of Gloucester.

 

GENERAL

Category

Inosilicate

Formula

lithium aluminium silicate, LiAl(SiO3)2

Crystal system

Monoclinic

Crystal class

Prismatic (2/m)

Space group

C2/c

Unit cell

a = 9.46 Å, b = 8.39 Å
c = 5.22 Å
β = 110.17°; Z = 4

IDENTIFICATION

Color

Highly variable: white, colorless, gray, pink, lilac, violet, yellow and green, may be bicolored; emerald green - hiddenite; lilac - kunzite; yellow - triphane

Crystal habit

prismatic, generally flattened and elongated, striated parallel to {100}, commonly massive

Twinning

Common on {100}

Cleavage

Perfect prismatic, two directions {110} ∧ {110} at 87°

Fracture

Uneven to subconchoidal

Tenacity

Brittle

Mohs scale hardness

6.5–7

Luster

Vitreous, pearly on cleavage

Streak

white

Specific gravity

3.03–3.23

Optical properties

Biaxial (+)

Refractive index

nα = 1.648–1.661 nβ = 1.655–1.670 nγ = 1.662–1.679

Birefringence

δ = 0.014–0.018

Pleochroism

Strong in kunzite: α-purple, γ-colorless; hiddenite: α-green, γ-colorless

2V angle

54° to 69°

Fusibility

3.5

Solubility

insoluble

Other characteristics

Tenebrescence, chatoyancy, kunzite often fluorescent under UV