Koroit Boulder Opal Rub Rough Green Fire 82.5crt - BO-108
 
Large slice of Koroit Boulder opal with exposed green fire and natural stone pattern.
 
Mine - Koroit Boulder
Body Tone - Iron Stone
Brightness - 4/5
Fire colour - Green
Size - 55x12x8mm
Weight - 82.5 carat - 16.5 grams
 
About Opals
 
Lustre: Pearly, Vitreous, Opalescence
Birthstone zodiac sign: Libra
Associated month: October
Crystal system: Amorphous solid
Chemical formula: SiO₂·nH₂O
Hardness (Mohs hardness scale): 5.5 – 6.5
Country of origin: Australia, Ethiopia, Mexico and Cornwall amazingly 
Size variations: can vary 0.3mm each way on all dimension given
 
Properties:
 
In mystical circles, opal is considered a stone representing hope, innocence and purity. It has strong connotations of happiness, faithfulness, loyalty and confidence.  Regarded as a powerful sea stone for safety on the water.
 
All orders are sent recorded delivery UK and International.