Lightning Ridge Rough Nobby Piece Opal 16.80 crts - OPL289
 
Dark base nobby with a bright red, green and blue fire section.  Could be carved into one stone or sliced for a couple.  Chance to cut a black opal.
 
Source - Lightning Ridge
Size - 25x18x10mm
Weight - 16.80 crts
Base Tone - N3
Fire Colour - Red Green Blue 
Brightness - 4/5 in rough form
 
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.