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Notes on opal-bearing surface rocks in the Northern Territory with reference to supplies of aggregate and sand

Created 17/10/2025

Updated 17/10/2025

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Geological work in the Territory since 1946 has provided more information on the composition of the so-called "porcelianite" which occupies much of the higher ground in the Peninsula on which the town of Darwin is built. This "porcelianite" is actually a fossil soil horizon and represents silicified lower zones of a laterite profile developed on Lower Cretaceous shales during Tertiary time. It is certain that at least some of the silica cementing the rock is in opaline form. The occurrence, distribution, types, and uses of opaline-material in the Northern Territory are discussed in this report. The results of testing conducted on aggregate samples are recorded, and recommendations are set down for further investigation of opaline-material.

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Field Value
Title Notes on opal-bearing surface rocks in the Northern Territory with reference to supplies of aggregate and sand
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/2d6e10e2-e548-4e27-bf77-0c27d940420d
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        129.0,
        -26.0
      ],
      [
        138.0,
        -26.0
      ],
      [
        138.0,
        -10.5
      ],
      [
        129.0,
        -10.5
      ],
      [
        129.0,
        -26.0
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Notes on opal-bearing surface rocks in the Northern Territory with reference to supplies of aggregate and sand". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/notes-on-opal-bearing-surface-rocks-in-the-northern-territory-with-reference-to-supplies-of-agg