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Magnesium Fluoride

Magnesium fluoride represented by the chemical formula MgF2 or F2Mg that bears the IUPAC name magnesium difluoride is a stable compound that is not hygroscopic as such and slightly soluble in dilute acids (like nitric acid) but insoluble in alcohol. It is an ionic compound of magnesium and fluorine and non-polar in gaseous phase [1, 8]. In UV light it fluoresces purple [8].

Magnesium Fluoride

Magnesium Fluoride Identification

CAS Number 7783-40-6 [1]
PubChem CID 24546 [1]
ChemSpider ID 22952 [2]
EC Number 231-995-1 [3]

How to Make It

Magnesium fluoride is synthesized by a reaction between magnesium oxide and ammonium bifluoride [8].

MgO + (NH4)HF2 = MgF2 + NH3 + H2O

Magnesium Fluoride Formula

Properties and Characteristics of Magnesium Fluoride

General Properties

Molar mass/molecular weight 62.302 g/mol [1]

Physical Properties

Color/appearance White crystals [3]
Melting point/freezing point 1260°C, 2300°F [3]
Boiling point 2260°C, 4100°F [3]
Density 3.2 g cm-3 [3]
State of matter at room temperature (normal phase) Solid [3]
Refractive index 1.4 [3]
Thermal conductivity 28 W/m-K [3]
Hardness (Mohs scale) 6 [10]
Specific heat capacity 0.92 X 103 J/(kg.deg C) [10]

Chemical Properties

Solubility in water No [3]
pH N/A [11]

Atomic Properties

Crystal structure Tetragonal [12]

Magnesium Fluoride Structure

Lewis Dot and Cross Diagram For Magnesium Fluoride

Magnesium Fluoride Uses

  1. In anti-reflective, multi-layer optical coatings on glass [4].
  2. As a durable material for lenses that can be used in UV and IR light eliminating birefringence [5].
  3. MgF2 windows are widely used in the deep and vacuum UV regions. They are durable and produce minimal aberrations [9].

Is It Dangerous

The compound can be acutely toxic if swallowed. It is a cause of serious eye, skin and respiratory tract irritation. So inhalation should be avoided [7].

Magnesium Fluoride (MgF2) Price

10 g of the inorganic compound powder costs around $15 [6].


  1. Magnesium Fluoride (MgF2) –
  2. Sellaite –
  3. Magnesium Fluoride –
  5. Magnesium Fluoride Plano-Convex Lenses, Uncoated –
  6. Magnesium fluoride, powder –
  7. Magnesium Fluoride –
  8. Magnesium Fluoride –
  9. Magnesium Fluoride Windows –
  10. Magnesium Fluoride (MgF2) –
  11. Magnesium Fluoride –
  12. Material

2 responses to “Magnesium Fluoride”

  1. Satish shah says:

    Very useful for me

  2. sonal says:


    what is the chemical used to remove Magnesium Fluoride (used for spectacles lens coatings) from the surface of spectacle lenses.

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