275ct Rough Andamooka Rainbow Matrix Opal Chunk (55g, 1.94oz)

Description: 275ct Rough Andamooka Rainbow Matrix Opal Chunk (55g, 1.94oz) - Hefty Andamooka rainbow matrix opal (AKA Concrete) found in Andamooka South Australia. Rainbow Matrix is an affordable way to create great looking black opals, with the added protection of a glassy resin coating. Pictures taken wet. Has been; sliced to show face of the stone, permanently darkened to N3/N4 with a single sugar carbon and heat treatment. - easier treatment method due to properties of this material. * Please refer to pictures and video for size and quality. - WYSIWYG Can be cut into stones, used for carving, or kept as a specimen. If cutting and shaping is deep then the material may require a further darkening treatment. - There are many resources online that show who to do this. * Treatment Process: Dissolve sugar into hot water at about 50/50 ratio,Place stones into sugar water mixture for 1 day, Take stone(s) out of sugar water mixture and dry naturally for 1 day,Place stone(s) individually in a double piece of tin foil (aluminium foil) and add spoon full of vegetable oil (any),Wrap the foil around the stone(s) - not too tightly,Place stone(s) in foil onto a BBQ - medium heat with closed lid for 1 hour,Turn off BBQ and leave it for 2 hours to cool. Clean the carbon off the face of the stone (with a CAB, Rotary, Sander) and Ta-Da! Finish a stone in 3 steps:Shape and rub stone down to at least 2000 grit,Wash and then dry the stone thoroughly,Coat in a two part epoxy resin for a glassy finish. Will combine shipping. All items sent registered mail Australia Post International buyers please note:Import duties, taxes and charges, if any, are the buyers responsibility

Price: 235 AUD

Location: Sutherland

End Time: 2025-01-14T22:17:42.000Z

Shipping Cost: 12.43 AUD