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Andamooka opal fields, Andamooka Ranges, Stuart Shelf, South Australia, Australiai
Regional Level Types
Andamooka opal fields- not defined -
Andamooka Ranges- not defined -
Stuart Shelf- not defined -
South AustraliaState
AustraliaCountry

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Key


Located 160 km NE of Pimba. Not as large a producer as the Coober Pedy opal fields, but well known for so-called crystal opal, a limpid colourless variety with a strong internal play of colours. This is somewhat like some of the Mexican precious opal but tends to be more stable.
Andamooka is also well known for matrix opal, the term referring to a micro-porous opal which often shows a weak play of colours when mined but is enhanced by first soaking the stone in a strong sugar solution and then boiling in sulphuric acid. The hot acid carbonises the sugar, thus giving a black background and enhancing the play of colours. This product is a legitimate gemstone, as long as it is properly labelled as treated matrix opal.
The field was discovered in 1930 and a detailed account of the discovery was given in a letter sent by Mrs. Jean Nugent of Kimba, SA to Australian Gems and Crafts Magazine. This was published in full by the editors, Cyril and Patricia Kovac in the June-July 1977 edition. The letter states that in 1930 two well-sinkers Roy Shepherd and Sam Brooks who were working on Andamooka Station, went out one evening to shoot a rabbit as they were short of meat. Roy picked up a stone and threw it to Sam saying "Catch this one Sam, it's a pretty one". This was the first piece of precious opal found on the field. The specimen was shown to Mrs. Nugent's husband "Oxy" Nugent who confirmed it as opal, having previously worked at Coober Pedy.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

Mineral list contains entries from the region specified including sub-localities

4 valid minerals.

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Opal4.DA.10SiO2 · nH2O
var: Black Opal4.DA.10SiO2 · nH2O
var: Mother of Opal4.DA.10SiO2 · nH2O
var: Opal Matrix4.DA.10SiO2 · nH2O
var: Pineapple Opal4.DA.10SiO2 · nH2O
var: Pinfire Opal4.DA.10SiO2 · nH2O
var: White Opal4.DA.10SiO2 · nH2O
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Alunite7.BC.10KAl3(SO4)2(OH)6
Gypsum7.CD.40CaSO4 · 2H2O
Group 9 - Silicates
Kaolinite9.ED.05Al2(Si2O5)(OH)4

List of minerals arranged by Dana 8th Edition classification

Group 29 - HYDRATED ACID AND NORMAL SULFATES
AXO4·xH2O
Gypsum29.6.3.1CaSO4 · 2H2O
Group 30 - ANHYDROUS SULFATES CONTAINING HYDROXYL OR HALOGEN
(AB)2(XO4)Zq
Alunite30.2.4.1KAl3(SO4)2(OH)6
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with H2O and organics
Opal75.2.1.1SiO2 · nH2O
Unclassified Minerals, Mixtures, etc.
Kaolinite-Al2(Si2O5)(OH)4
Opal
var: Black Opal
-SiO2 · nH2O
var: Mother of Opal-SiO2 · nH2O
var: Opal Matrix-SiO2 · nH2O
var: Pineapple Opal-SiO2 · nH2O
var: Pinfire Opal-SiO2 · nH2O
var: White Opal-SiO2 · nH2O

List of minerals for each chemical element

HHydrogen
H OpalSiO2 · nH2O
H GypsumCaSO4 · 2H2O
H KaoliniteAl2(Si2O5)(OH)4
H AluniteKAl3(SO4)2(OH)6
H Opal (var: Black Opal)SiO2 · nH2O
OOxygen
O OpalSiO2 · nH2O
O GypsumCaSO4 · 2H2O
O KaoliniteAl2(Si2O5)(OH)4
O AluniteKAl3(SO4)2(OH)6
O Opal (var: Black Opal)SiO2 · nH2O
AlAluminium
Al KaoliniteAl2(Si2O5)(OH)4
Al AluniteKAl3(SO4)2(OH)6
SiSilicon
Si OpalSiO2 · nH2O
Si KaoliniteAl2(Si2O5)(OH)4
Si Opal (var: Black Opal)SiO2 · nH2O
SSulfur
S GypsumCaSO4 · 2H2O
S AluniteKAl3(SO4)2(OH)6
KPotassium
K AluniteKAl3(SO4)2(OH)6
CaCalcium
Ca GypsumCaSO4 · 2H2O

Localities in this Region

Other Regions, Features and Areas that Intersect

Australia
Australian PlateTectonic Plate

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.
 
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