Editorial Feature

Reyerite – Occurrence, Properties and Distribution

Reyerite is named after Edouard Reyer, an Austrian geologist. It is also commonly called Glimer Zeolith. It has a crystalline structure similar to minehillite.

Properties of Reyerite

The key physical properties of Reyerite are as below:

  • Cell Data
    • Space group: P3
    • a = 9.767
    • c=19.067
    • Z = 1
  • Crystal Data
    • Hexagonal
    • Point group: 3
    • Crystals – in radiating aggregates of thin hexagonal plates; massive and intergrown with chlorite.
    • X-ray powder pattern: Niaqorant, Greenland; can resemble gyrolite or truscottite.
      3.17 (vs), 2.855 (s), 2.659 (s), 1.846 (s), 4.23 (ms), 3.52 (m), 3.035 (m)
  • Chemical Composition
    Elements Content 1 Content 2 Content 3
    SiO2 53.2 54.7 53.4
    Al2O3 3.8 4.4 4.7
    CaO 32.3 31.6 31.8
    Na2O 2.3 3.5 1.5
    K2O 1.6 2.2 5.2
    H2O 6.0 [3.6] [3.4]
  • Optical Properties
    • Transparent to translucent
    • Optical class- Uniaxial
    • ω = 1.563–1.568
    • ε = 1.558–1.563
  • Estimated Properties
    Electron density Bulk density (electron density)= 2.57 g/cm3
    note: Specific gravity of Reyerite = 2.56 g/cm3
    Photoelectric PEReyerite = 3.94 barns/electron
    U=PEReyerite x ρelectron density= 10.12 barns/cm3
    Fermion index Fermion index = 0.01
    Boson index = 0.99
    GRapi = 22.53 (Gamma Ray American Petroleum Institute Units)
    Concentration of Reyerite per GRapi unit=4.44%
    Estimated radioactivity from Reyerite is barely detectable

How to Identify Reyerite

Reyerite appears as colorless to white colored or pale green with chlorite inclusions. It exhibits a vitreous, pearly lustre. The density of this mineral varies from 2.51 to 2.58 and its hardness varies from 3-4.

Global Distribution

Reyerite is widely distributed in the following locations:

  • Greenland – from Kitaa Province, West Greenland
  • Scotland –from North West Highlands, Isle of Skye and Strathclyde, Isle of Mull
  • USA- from Durham Quarry, North Carolina and Rawlings Quarry, Virginia.

Occurrence of Reyerite and Useful Mineral Association

Reyerite occurs in tuff, basalt and within the contact aureole of a volcanic plug and in low grade regionally metamorphosed diabase dike.

It is usually associated with minerals such as calcite, analcime, natrolite, pectolite, chlorite and gyrolite.


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