Cts.75.50 Ethiopian Rough Opal Specimen
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Item Details
Description
Mineral : Natural Ethiopian Rough Opal
Dimensions: 30x29x20mm
Weight: 75.50 Cts
Origin (Region/ City):Ethiopia , Wello
Origin (Country): Africa
Pictures taken with high resolution camera on different backgrounds in order to depict the item as realistically as possible.
International registered mail with tracking number.
Description
An opal is a hydrated form of silica with a water content ranging from 3 to 21%.Indeed, it is this permeability to water that makes it a hydrophile.Opals are deposited at a relatively low temperature and may occur in the fissures of almost any kind of rock, being most commonly found with limonite, sandstone, rhyolite, marl, and basalt. Precious opals show a variable interplay of internal colors.Hydrophane OpalsA category of opals is the hydrophane. The hydrophane opal is a particular variety of opal that, having lost its water, appears murky and insignificant. It is, however, surprising what happens to this stone when it is immersed in water (time varies from minutes to some days): its refraction index goes from 1.40 to 1.44 and being rehydrated is almost unrecognizable due to its newly found almost impeccable transparency and splendid hues of iridescence. However, this treatment is skin-deep. When referring to the hydrophane opal, we’re therefore talking about a category of this mineral that is not sparkly, is highly porous and becomes transparent when immersed in water.
Dimensions: 30x29x20mm
Weight: 75.50 Cts
Origin (Region/ City):Ethiopia , Wello
Origin (Country): Africa
Pictures taken with high resolution camera on different backgrounds in order to depict the item as realistically as possible.
International registered mail with tracking number.
Description
An opal is a hydrated form of silica with a water content ranging from 3 to 21%.Indeed, it is this permeability to water that makes it a hydrophile.Opals are deposited at a relatively low temperature and may occur in the fissures of almost any kind of rock, being most commonly found with limonite, sandstone, rhyolite, marl, and basalt. Precious opals show a variable interplay of internal colors.Hydrophane OpalsA category of opals is the hydrophane. The hydrophane opal is a particular variety of opal that, having lost its water, appears murky and insignificant. It is, however, surprising what happens to this stone when it is immersed in water (time varies from minutes to some days): its refraction index goes from 1.40 to 1.44 and being rehydrated is almost unrecognizable due to its newly found almost impeccable transparency and splendid hues of iridescence. However, this treatment is skin-deep. When referring to the hydrophane opal, we’re therefore talking about a category of this mineral that is not sparkly, is highly porous and becomes transparent when immersed in water.
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Cts.75.50 Ethiopian Rough Opal Specimen
Estimate €750 - €1,290
2 bidders are watching this item.
Shipping & Pickup Options
Item located in Roma, italia, it$12 shipping in the US
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