THE MINERAL GORMANITE

  • Chemistry: (Fe, Mg)3Al4(PO4)4(OH)6 - 2H2O, Hydrated Iron Magnesium Aluminum Phosphate Hydroxide.
  • Class: Phosphates
  • Uses: Only as mineral specimens.
  • Specimens

Gormanite is one of the new phosphates coming from the hydrothermal phosphate deposits such as the Rapid Creek, Big Fish River and Blow River areas in the Yukon Territory of Canada. Gormanite forms a series with the mineral souzalite.

A series is a set of minerals that differ only in their chemical content and not appreciably in their respective structures. The chemical difference is usually between two elements that can occupy the same site in a crystal lattice and thus can substitute for each other. If the substitution can range from 100% of element A to 100% of element B in the site, then the series is called a complete series. In this case, the series is probably incomplete between the magnesium rich souzalite and the iron rich gormanite.

Gormanite is relatively new to the mineral world having been described in just the last 20 years. Gormanite forms attractive, colorful specimens with generally good crystals that are easily a good addition to anyone's collection.

PHYSICAL CHARACTERISTICS:

  • Color is blue-green.
  • Luster is vitreous.
  • Transparency: Specimens are translucent to transparent.
  • Crystal System: Triclinic; bar 1
  • Crystal Habits include stubby to prismatic crystals and druzy crusts.
  • Hardness is 4 - 5
  • Specific Gravity is approximately 3.1 (average for translucent minerals)
  • Associated Minerals include other phosphates such as wardite, goyazite, augelite, whiteite, ludlamite, kulanite, lazulite and brazilianite as well as siderite and calcite among others.
  • Notable Occurrences: The Rapid Creek, Big Fish River and Blow River areas, Yukon Territory, Canada and limited examples elsewhere.
  • Best Field Indicators: color, crystal habit, associations and localities.
This Site Awarded
Available GORMANITE specimens:
see this List of ALL specimens including SOLD ones

 

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