8.81 cts - boulder - Australia Opal - cabochon free form - loose gemstone yowah picture stone fire green opal boulder
Boulder Opal, Australia
Stone in my Studio
Cut: cabochon free form
Size: 17 x 8 x 6 mm
Weight: 8.81 carats
Treatment: None - natural gemstone.
Origin: Queensland, Australia
Photo: Neutral light without flash - the colors are usually darker in real life and sunlight. You will always receive stone pictured with the same colors.
Opal is the birthstone for those who were born in October.
Opal wedding = 21 years of marriage
The Boulder Opal, also called Pebble Opal, hails from the region of Queensland, Australia. Specifically found in regions of South West Queensland: Quilpie, Yowah, erotic.
Sedimentary rocks in this area dating from the Cretaceous period (-140 million to-65 million years before.) BC). Most opals from these arid, during periods of rainfall, tiny particles of silica was dissolved in water. When the water has evaporated, these pieces of silica crystallized into small spheres in the rock and gave birth to opals.
The first Boulder opals were discovered in 1869 and the first mine born in 1871 in the County of Quilpie. Very quickly a few minor arrived in this area to exploit this wealth as Bekerlman Lambert that presented opals in the 'London Gem Exhibition 'from 1893 that immediately made feel.
Features of the Boulder Opal.
The Boulder Opal is imprisoned Opal veins in the iron ore. We usually size so that part of this mineral around the veins of Opal. Size is quite delicate due to the hardness of iron ore compared to the opal. But thanks to this peculiarity, these opals are known to be stronger than their counterparts. The Boulder Opal is especially interesting because the contrast of Black Rock matrix makes multiple bright colors of Opal games. For the Boulders opals color are more often in shades of blue-green.
They are usually cut in the direction of the vein of opal with ore in the back support, the surface of the stone is then covered with Opal; or size Cross perpendicular to the veins of Opal to highlight stripes silica trapped in the rock.
You might also like
More from this seller
Shipping & policies
- Money Order
- Other Method
Returns & exchanges
- Custom or personalized orders
- Perishable products (like food or flowers)
- Digital downloads
- Intimate items (for health/hygiene reasons)
- Items on sale