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Cut Spinel

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Original price $110
Current price $105
 

Bright red color of cut Spinel of different sizes and shapes.. 

Price per carat: 105 $ per carat (17,000 PKR per carat)

Total number of stones in the lot: 5

Total Weight of all the Spinels: 9 carats

Total Price of the whole lot: 945 $ (151,000 PKR)

Origin: Afghanistan

Color: Red


5 stones of different sizes, shapes and beautiful red color.

 

You can also buy one stone of your choice for 105 $ per carat (17,000 PKR).

 

 

Spinel is the magnesium/aluminium member of the larger spinel group of minerals. It has the formula MgAl2O4 in the cubic crystal system. Its name comes from the Latin word "spinella", which means spine in reference to its pointed crystals.

Spinel has long been found in the gemstone-bearing gravel of Sri Lanka and in limestones of the Badakshan Province in modern-day Afghanistan and Tajikistan; and of Mogok in Myanmar.

Spinel crystallizes in the isometric system; common crystal forms are octahedra, usually twinned. It has an imperfect octahedral cleavage and a conchoidal fracture. Its hardness is 8, its specific gravity is 3.5–4.1, and it is transparent to opaque with a vitreous to dull luster. It may be colorless, but is usually various shades of pink, rose, red, blue, green, yellow, brown, black, or (uncommon) violet.

 

GENERAL

Category

·         Oxide minerals

·         Spinel group

·         Spinel structural group

Formula

MgAl2O4

Strunz classification

4.BB.05

Crystal system

Cubic

Crystal class

Hextetrahedral (43m)
H-M symbol: (43m)

Space group

F 4 3 m (No. 216)

Unit cell

a = 8.0898(9) Å; Z = 8

IDENTIFICATION

Color

Various; red, pink, blue, lavender/violet, dark green, brown, black, colourless

Crystal habit

Octehedra or flat triangular plates caused by twinning

Twinning

common

Cleavage

None

Fracture

Conchoidal

Mohs scale hardness

7.5–8.0

Luster

Vitreous

Streak

White

Diaphaneity

Transparent to opaque

Specific gravity

(depending on the composition) the rare, Zn-rich spinel can be as high as 4.40, otherwise it averages from 3.58 to 3.61

Optical properties

Isotropic

Refractive index

1.719

Pleochroism

Absent

Solubility

none

Other characteristics

Weak to medium magnetic, sometimes fluorescent (red synthetic yes, natural red sometimes)