18.85 carat Mintabie crystal free form opal - OPL047
 
This opal has a lovely sky blue crystal over the top of greens and oranges. Top example of Mintabie Opal. Hard to put this one down.
 
Mine - Mintabie - Australia
Body Tone - crystal
Brightness - 4/5
Fire colour - Blue Green
Size - 25x19x5.4mm
Weight - 18.85 carat
 
About Opals
 
Luster: 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.
 
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