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Grawin & Glengarry Opal Fields, Lightning Ridge, Finch Co., New South Wales, Australiai
Regional Level Types
Grawin & Glengarry Opal Fields- not defined -
Lightning RidgeRidge
Finch Co.County
New South WalesState
AustraliaCountry

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Key
Latitude & Longitude (WGS84):
29° 39' 22'' South , 147° 39' 16'' East
Latitude & Longitude (decimal):
Nearest Settlements:
PlacePopulationDistance
Cumborah493 (2013)14.8km
Lightning Ridge2,685 (2012)40.4km


About 40 kilometres south west of Lightning Ridge.

Underground and open cut mining techniques are used to extract opal from depths ranging from near surface up to 25 metres underground. The host rock is the Cretaceous Griman Creek Formation which is predominantly composed of freshwater (rarely estuarine?) claystones and sandstones.

Most of the gem opal from this area is found as "seam" opal. Seam opal typically occurs as semi-continuous plates or sheets of variable thickness within claystone layers. The thickness of the sheet can range from less than 1mm up to 5cm or more. Individial pieces can rarely weigh up to a few kilograms.

Opalised fossils also occur sporadically. Fossils include bivalve shells, gastropod shells, dinosaur bones & teeth, turtle shell & bones, crustacean gastroliths, plant stems & fruiting bodies, plesiosaur bones & teeth, monotreme bones, etc.

Regions containing this locality

Australian Plate (Australia Plate)Tectonic Plate
Eromanga Basin, AustraliaBasin
Lachlan Orogen, AustraliaOrogen
Eastern Province, Lachlan Orogen, AustraliaGeologic Province

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


1 valid mineral.

Detailed Mineral List:

Opal
Formula: SiO2 · nH2O
Reference: - Cram, L. (2004): A Journey with Colour, Vol 2, Part B - A History of Lightning Ridge Opal 1873-2003, Len Cram. - Australian Opal Centre web site http://www.australianopalcentre.com/
Opal var: Black Opal
Formula: SiO2 · nH2O
Reference: Cram, L. (2004): A Journey with Colour, Vol 2, Part B - A History of Lightning Ridge Opal 1873-2003
Opal var: Bone Opal
Formula: SiO2 · nH2O
Reference: Cram, L. (2004): A Journey with Colour, Vol 2, Part B - A History of Lightning Ridge Opal 1873-2003
Opal var: Precious Opal
Formula: SiO2 · nH2O
Reference: - Cram, L. (2004): A Journey with Colour, Vol 2, Part B - A History of Lightning Ridge Opal 1873-2003, Len Cram. - Australian Opal Centre web site http://www.australianopalcentre.com/
Opal var: Shell Opal
Reference: - Smith, E. & R. (1999): Black Opal Fossils of Lightning Ridge - Treasures from the Rainbow Billabong, Kangaroo Press, East Roseville.
Opal var: Wood Opal
Formula: SiO2 · nH2O
Reference: - Smith, E. & R. (1999): Black Opal Fossils of Lightning Ridge - Treasures from the Rainbow Billabong, Kangaroo Press, East Roseville.

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: Bone Opal4.DA.10SiO2 · nH2O
var: Precious Opal4.DA.10SiO2 · nH2O
var: Shell Opal4.DA.10SiO2 · nH2O
var: Wood Opal4.DA.10SiO2 · nH2O

List of minerals arranged by Dana 8th Edition classification

Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with H2O and organics
Opal75.2.1.1SiO2 · nH2O
Unclassified Minerals, Mixtures, etc.
var: Black Opal-SiO2 · nH2O
var: Bone Opal-SiO2 · nH2O
var: Precious Opal-SiO2 · nH2O
var: Shell Opal-SiO2 · nH2O
var: Wood Opal-SiO2 · nH2O

List of minerals for each chemical element

HHydrogen
H Opal (var: Precious Opal)SiO2 · nH2O
H OpalSiO2 · nH2O
H Opal (var: Wood Opal)SiO2 · nH2O
H Opal (var: Bone Opal)SiO2 · nH2O
H Opal (var: Black Opal)SiO2 · nH2O
OOxygen
O Opal (var: Precious Opal)SiO2 · nH2O
O OpalSiO2 · nH2O
O Opal (var: Wood Opal)SiO2 · nH2O
O Opal (var: Bone Opal)SiO2 · nH2O
O Opal (var: Black Opal)SiO2 · nH2O
SiSilicon
Si Opal (var: Precious Opal)SiO2 · nH2O
Si OpalSiO2 · nH2O
Si Opal (var: Wood Opal)SiO2 · nH2O
Si Opal (var: Bone Opal)SiO2 · nH2O
Si Opal (var: Black Opal)SiO2 · nH2O

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
- Smith, E. & R. (1999): Black Opal Fossils of Lightning Ridge - Treasures from the Rainbow Billabong, Kangaroo Press, East Roseville.
- Cram, L. (2004): A Journey with Colour, Vol 2, Part B - A History of Lightning Ridge Opal 1873-2003, Len Cram.

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