spinel MgAl2O4

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$1.00 - $1,000.00 / Pieces | 1 Piece/Pieces (Min. Order)
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Place of Origin:
Shanghai, China
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Supply Ability:
2 Kilohertz per Month
Packaging & Delivery
Packaging Details
vacuum or plastic and sponge packing
Shanghai China
Lead Time :
depend on what kind of your order


Transparent ceramic spinel (Transparent Magnesium Aluminate spinel, MgAl2O4 transparent spinel, MA polycrystalline spinel) is a

Transparent Ceramic spinel


Transparent ceramic spinel (Transparent Magnesium Aluminate spinel, MgAl2O4 transparent spinel, MA polycrystalline spinel) is an attractive material for uses in a wide range of optical, electronic and structural applications including windows and lenses, which require excellent transmission from the visible through to the mid IR. Theoretical transmission is very uniform and approaches 87% between 0.3 to 5 microns. Transmission characteristics rival that of ALON and sapphire in the mid-wave IR, making it especially attractive for the ever-increasing performance requirements of current and next-generation IR imaging systems.

Physical properties







Thermal conductivity

15w/m · k

Melting point


Thermal expansion


Knoop hardness


Dielectric constant




Refractive index



Crystal structure








Flexural strength



Application fields:

  • Pressure vessel sight glass; furnace sight glass.
  • Substrate material,Project TV faceplate.
  • Optical windows; optical lens; prisms; domes.
  • A valve flap; valve seat; a water-jet cutting flow-shaper; a nozzle for process fluids.
  • An optical fiber connector; components in a high-speed printer and for optical computers.
  • High-pressure arc lamp
  • Watch crystal; safety goggles.
  • Surgical knives;


Tile and camber samples smaller than Φ220mm X 15mm are available.

Hemsphrer samples smaller than Φ150mm X 6mm are available.

We are the unique producer to supply the transparent ceramic spinel in China. It has the best ratio of performance to price


Transmittance of transparent ceramic spinel


  • Color is red, green, blue, purple, brown, and black; but red is by far the more common color.
  • Luster is vitreous.
  • Transparency: Crystals are transparent to translucent and sometimes nearly opaque.
  • Crystal System: Isometric; 4/m bar 3 2/m
  • Crystal Habits include the typical octahedron, but can be found as dodecahedrons and combinations of other isometric forms. Also as rounded grains in alluvial placer deposits.
  • Cleavage: None
  • Fracture is conchoidal.
  • Hardness is 7.5-8.0
  • Specific Gravity is 3.6-4.0
  • Streak is white.
  • Other Characteristics: index of refraction is approximately 1.71 - 1.76 and rutile inclusions may produce six or four rayed stars or asterisms.
  • Associated Minerals include Calcite, dolomite, corundum and garnets .
  • Notable Occurrences include Burma, Sri Lanka, Brazil and Afghanistan.
  • Best Field Indicators are twinned crystals if present, color, hardness, density and locality.

Now treasured for its own sake, spinel is a favourite of gem dealers and collectors on account of its brilliance, hardness and wide range of spectacular colours. In addition to beautiful rich reds, spinel can be found in a range of gorgeous pastel shades of pink and purple. Of particular interest is a vivid hot pink with a tinge of orange mined in Burma. It is one of the most spectacular gemstone colours seen in any species at all. Spinel also comes in beautiful blue tones called cobalt spinel, but these are very, very rare.

Because spinels made in a laboratory are often used for imitation birthstone rings, many people think 'synthetic' when they hear the name spinel. Often enough, they have never even seen the real thing.

In fact, the main factor preventing the spinel from achieving greater recognition is its rarity. Fine spinels are now rarer than the rubies they used to imitate. Strangely, they are also more affordable: in the gem world, being too rare can be a drawback because so few people even get a chance to develop a fondness for the varieties in question.

In addition to Burma, spinel is mined in Sri Lanka, Tanzania, and Tadzhikistan, part of the former Soviet Union.

Spinel is a durable gemstone that is perfect for all jewellery uses. It is most often faceted in oval, round, or cushion shapes and is not currently found in calibrated sizes due to its rarity

transmittance of transparent ceramic spinel


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