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Pumice Properties Kenya

Pumice Properties

Physical Properties

  • Composed of highly micro vesicular glass pyroclastic with very thin, translucent bubble walls of extrusive igneous rock.
  • Commonly, but not exclusively of silicic to intermediate composition but basaltic and other compositions are known.
  • Commonly pale in color ranging from white, cream, blue or grey to green-brown or black.
  • Is a common product of explosive eruptions (plinian and ignimbrite-forming) and commonly forms zones in upper parts of silicic lavas.
  • Has a porosity of 64-85% by volume, floats on water possibly for years, until it is eventually waterlogged and sinks.
  • Occurs in two main forms of vesicles, tubular and subspherical micro vesicles.

Pumice Properties Kenya Naivasha Company Pumice Properties Kenya

Chemical Properties Properties

  • Chemical name: Amorphous Aluminum Silicate.
  • Hardness (MOHS): 6
  • pH: 7.2
  • Radioactivity: none
  • Loss on Ignition (LOI) : 5%
  • Softening point: 900°C
  • Water soluble substances: 0.15%
  • Acid soluble substances: 2.9%
  • Reactivity: Inert


Typical Chemical averages

  • Silicon Dioxide- 76.2%
  • Aluminum Oxide- 13.5%
  • Ferric Oxide- 1.1%
  • Ferrous Oxide- 0.1%
  • Sodium Oxide- 1.6%
  • Potassium Oxide- 1.8%
  • Calcium Oxide- 0.8%
  • Titanium Oxide- 0.2%
  • Magnesium Oxide- 0.05%
  • Water- <1.0%