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Chinese Name:尖晶石
English Name:Spinel
Chemical Composition:MgAl2O4 (Magnesium Aluminium Oxide)
Crystal System:Cubic
Hardness:7.5 - 8.0
SG:3.58 - 3.61
RI: 1.71 - 1.74 (Single Refraction)
Related Chakra: Different Colour related to different chakra;Red: Root
Locality:Burma, Sri Lanks, Madagascar, Afhanistan, Pakistan, Brazil, Australia, Italy, Turkey, Russia, USA
Colour:Red
Other Spinel:Pink, Orange, Blue, Green, Purple, Yellow, Brown, Black, Colourless/White and Colour Change
Optical Effect:Might show 4-rays or 6-ryas Star Effect if there's enough silk like rutile inclusions
Remarks:Its name comes from Latin "spina" (arrow), because of the shape of its rough
 
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Function:
1. Eliminate sickness & negative energy.
2. Increase communication ability.
3. It's a kind of wealthy stone.
4. Increase self confidence.
5. A good stone for marriage.
 
General care:
 
1. The gem is durable enough for everyday wear.
2. Avoid strong heat.
3. Cleaning: Use lukewarm plain water, mild soap and a soft brush to scrub behind the stone where dirt can collect.
 
The oxide spinels have a formula of the model [A][B]2O4; where [A] is commonly Fe2+, Mg2+, or Mn2+, and [B] is Fe3+, Al3+, or Cr3+.
  Variety of Spinel Description RI
SG
Chemical Composition Colour
1. Magnesium Spinel As Magnesium Alunminium Oxide, with little colouring elements. 1.71 - 1.74 3.58 - 3.61 MgAl2O4 Red,Pink,Blue,Purple,Green,Brown and Colourless
2. Alkali-spinel Variety of Spinel containing Na2O 1.38%, K2O 1.31%. 1.71 - 1.74 3.65 - 4.55 MgAl2O4 Dark Green
3. Ceylonite A ferroan spinel with Mg:Fe from 3:1 and 1:1 and little or no ferric iron. 1.77 - 1.80 3.63 - 3.90 (Mg,Fe)Al2O4 Dark Green, Gray to black
4. Chlorospinel A ferrian variety of Spinel containing Fe3+ next in abundance after Al. 1.77 - 1.78 3.63 - 3.90 MgAl2O4 Green
5. Ferropicotite A ferroan variety of spinel 1.77 - 1.78 3.60 - 4.10 MgAl2O4 Dark Gray to Black
6. Gahnospinel A variety of spinel rich in zinc. 1.73 - 1.79 3.65 - 4.55 (Mg,Zn)Al2O4 Light to Dark Blue, Violet or Black
7. Iron-magnesia Spinel (Hercynite) A ferroan variety of spinel 1.80 - 1.84 4.39 FeAl2O4 Dark Blue, Green, Yellow or Brown
8. Magnochromite A chromium variety of spinel 1.71 - 1.74 3.58 - 3.61 MgAl2O4 Red
9. Chrome Spinel/Picotite A chromium bearing, dark-green to dark-brown spinel 2.08 - 2.16 4.05 - 4.80 FeCr2O4 Dark Yellowish Brown to greenish brown
10. Pleonaste An intermediate variety of the Hercynite-Spinel Series, = iron-rich spinel or magnesium-rich hercynite 1.77 - 1.80 3.63 - 3.90 (Mg,Fe)Al204 Dark Green to Blue-green to black
11. Rubicelle Yellow to orange-red variety 1.71 - 1.74 3.60 - 4.10 MgAl2O4 Yellow, orange to Red
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