Koroit Boulder Opal Rub Rough Green Fire 50crt -BO-104
 
Stunning Koroit boulder opal rub rough piece, exposed face of greens and blue.  Some sand spots to carve around.  Will cut a parge stone or a selection of smaller ones.
 
Mine - Koroit Boulder
Body Tone - Iron Stone
Brightness - 4/5
Fire colour - Green and blue
Size - 25x15x15mm
Weight - 50 carat - 10 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.