A course or fine white mineral powder that is naturally occurring, chemically inert and stable to very high temperatures. Insoluble in water, dilute acids and hot concentrated sulfuric acid.

Zircon is a mineral belonging to the group of nesosilicates. Its chemical name is zirconium silicate and its corresponding chemical formula is ZrSiO4. Hafnium is almost always present in quantities ranging from 1 to 4%. The crystal structure of zircon is a tetragonal crystal class. The natural color of zircon varies between colorless, yellow-golden, red, brown, and green. Colorless specimens that show gem quality are a popular substitute for diamond; these specimens are also known as “Matura diamond”. It is not to be confused with cubic zirconium, a synthetic substance with a completely different chemical composition.

Chemical Name:  Zirconium silicate

Chemical Formula:  ZrSiO4


Zircon flour/zircon sand, zirconium silicate, zirconium orthosilicate, ZrSiO4, hyacinth, (silicic acid, zirconium (4+) salt), zircon, zirconium silicon oxide, CAS # 10101-52-7

Chemical Properties:

ZrO2= 66.0%, SiO2= 32.0%

Physical Properties:

  1. -40 + 200 mesh
  2. 200 mesh and finer
  3. 325 mesh and finer
  4. 400 mesh and finer
  5. 600 mesh and finer
  6. Between 0.7 and 2.4 mm bead granulations

Typical Applications:

ZrSiO4 is High-temperature applications. The primary source for investment casting shell molds, foundry cores, metal chills, ladle brick, welding rod coatings, abrasive cleaning, ceramics, glass, chemical, refractory bricks, abrasive & mold washes, solid oxide fuel cells, and nuclear power plants.


Molecular Weight (g/mol.)183.1
Bulk Density (lbs./ft.3)115-130 & 170-180
Specific Gravity4.5 to 4.8
Solid Specific Heat0.132
Melting Point (°C)2200 to 2550
Dissociation Temp. (°F)3200
Thermal Exp. Coef. (cm/cm/°C)4.2
Mohs Hardness @20°C7.5-8.0
An angle of Repose (degrees)30
L.O.I.0.15 to 0.25
Thermal Conductivity (BTU/sq.ft./hr/°F/in.) 14.5