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Mookaite

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Colour:
Varicoloured white, ...
Lustre:
Vitreous
Hardness:
6 - 7
Name:
Named after Mooka Station on which it was found.
The term 'Mookaite' is an unofficial, locally coined name for a silicified porcelanite which forms in the weathering profile of a geological formation known as Windalia Radiolarite (WR), a Lower Cretaceous siltstone that outcrops over much of the Carnarvon Basin in Western Australia.

Mookaite is variously, and incorrectly, described as chert, opalite, chalcedony or combinations of the three.

From a strictly geological perspective however, Mookaite is best defined as a silicified type of Windalia Radiolarite whose silification is opaline to chalcedonic.

[A.McLaren, www.eskimo.com/~knapper/mookaite.htm]

In Featherston et.al. Mookaite is described as being "dominantly massive ultrafine silica".


Classification of Mookaite

Physical Properties of Mookaite

Vitreous
Diaphaneity (Transparency):
Translucent, Opaque
Comment:
Vitreous with patches of matte appearance
Colour:
Varicoloured white, cream, brown, grey, yellow, orange-red, purple-red, yellow, mauve
Comment:
Colouring due to iron oxide/hydroxide granules
Hardness (Mohs):
6 - 7

Other Names for Mookaite

Name in Other Languages:

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Mookaite

Reference List:
http://www.outbackmining.com/mookaite

https://en.wikipedia.org/wiki/Radiolarite

http://gemfossicking.com.au/modules/AMS/article.php?storyid=67

http://aussielapidaryforum.com/forum/index.php?topic=4118.0

(Dead link) http://www.eskimo.com/~knapper/mookaite.htm (A.McLaren)

Fetherston, J.M., Stocklmayer, S.M., Stocklmayer, V.C. (2013) Gemstones of Western Australia. Geological Survey of Western Australia, Mineral Resources Bulletin 25, 306p.

Internet Links for Mookaite

mindat.org URL:
https://www.mindat.org/min-27597.html
Please feel free to link to this page.

Localities for Mookaite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Australia
 
  • Western Australia
    • Carnarvon Shire
Carnarvon Tourist Bureau
Mineral and/or Locality  
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