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Chinese Name:黑尖晶石
English Name:Black Spinel
Chemical Composition:MgAl2O4 (Magnesium Aluminium Oxide), (Mg,Fe)Al204 (Magnesium,Iron Aluminium Oxide), (Mg,Zn)Al2O4 (Magnesium,Zinc Aluminium Oxide)
Crystal System:Cubic
Hardness:7.5 - 8.0
SG:3.60 - 4.55
RI: 1.71 - 1.80 (Single Refraction)
Related Chakra:Root
Locality:Thailand, Africa, Myanmar, Sri Lanka, Madagascar
Colour:Black
Other Spinel:Red, Pink, Orange, Blue, Green, Purple, Yellow, Brown, 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 crystal.
 
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Function:
1. Wear as a talisman.
2. To help remove blockages of chakras.
3. It is also a lovely stone for reducing stress and relieving depression.
4. It's perfect for those who have problem in moving on from certain tragedy or sadness due to loss.
5. Black Spinel also works to help remove the resentment and anger, negative energy which lead to destruction.
6. Black Spinel can also perform as tool to help attract wealth and prosperity including money by removing all the obstacles that one faces.
 
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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