Parcel of Mexican Fire Opal Rough MO/157

Item Information

Dimensions (mm) not provided
Weight (carats) 19 carats



 SIZE: 20.5 x 16 x 8 mm (lighter stone)

17x13.5x10mm (darker stone)

  this opal is photographed dry. 


Fire Opal was born in fire, in the ancient volcanoes of Mexico. Fire opal is believed to form when water seeps into silica-rich lava, filling seams and hollows. Under heat and pressure, the silica forms a solid gel, trapping the remaining water within its structure. Small pebbles of fire opal are found embedded in lava flows.  Fire opal is mined in the Mexican states of Queretaro, Hidalgo, Guerrero, Michoacan, Julisio, Chihuahua and San Luis Potosi. The most important mines in Queretaro were discovered in 1835 and are still producing today. Small quantities of fire opal can also be found in Oregon and British Columbia in Canada.

 Fire opal - is a term used to describe the opal body tone rather than color play. Generally it ranges from deep and rich red, orange to amber tones. Mexican fire opal that displays play of color is rare. It is belived to be because volcanic opal forms relatively quickly and the spheres of silica rarely have time to settle into the diffraction grids that create play of color.

Contra-Luz - is a term used to describe the color play that is visible when the light source is behind the opal with transparent or translucent mexican opal. 



$49.00 USD

Add to Cart Make an Offer
Shipping $15.00
21 Days via Standard Shipping - Tracked
Add to Watch List Ask a Question * All prices in USD

Audit Information

The Opal Sheriff program allows our members to request an audit on any auction, which is completed by an independent Gemologist who assesses the accuracy of the item description and pictures.

Pricing & Details

Auction ID 223429
Watchers 5 watching
Viewed 12,222 times
Starts 7th Apr 2010 7:33pm PDT

Shipping & Insurance

Provider Shipping Transit
Standard Shipping - Tracked $15.00 21 days
Shipping Insurance all providers $8.00 (optional)

Opalescence Details

You May Also Like