Rough- 31 g - (1)
04
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Current bid
€ 5
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Selected by Georgia Foteinou
Holds BSc in geology and post-graduate qualifications in geochemistry.
Estimate € 150 - € 200
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 Bidder 4676 | €5 |
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Welo opal from Ethiopia in rough form, weighing 31 g, displays multicolor play and natural material for cabochon or setting.
AI-assisted summary
Description from the seller
Ópalo Welo
Multicolor
Raw form
Weight 148cts
Natural state
Opal is a mineraloid with a composition similar to quartz, but it differs due to its amorphous, non-crystalline nature and because it contains water molecules within its structure. Its formula is SiO2•nH2O. Despite its amorphous structure, it has historically been considered a mineral.
The chemical composition of opal is SiO2·H2O, silicon dioxide combined with water (an opal stone can contain up to 30% water). The Mohs hardness of opal is measured between 6.0 and 6.5 on a hardness scale similar to that of quartz.
Shipment has been made with a tracking number.
Ópalo Welo
Multicolor
Raw form
Weight 148cts
Natural state
Opal is a mineraloid with a composition similar to quartz, but it differs due to its amorphous, non-crystalline nature and because it contains water molecules within its structure. Its formula is SiO2•nH2O. Despite its amorphous structure, it has historically been considered a mineral.
The chemical composition of opal is SiO2·H2O, silicon dioxide combined with water (an opal stone can contain up to 30% water). The Mohs hardness of opal is measured between 6.0 and 6.5 on a hardness scale similar to that of quartz.
Shipment has been made with a tracking number.
Details
Number of items
1
Mineral Form
Rough
Weight
31 g
Origin (Region/ City)
Welo
Country of Origin
Ethiopia
Sold by
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It is believed that certain gemstones and minerals have beneficial health and spiritual properties. However, using or wearing gemstones or minerals does not mean that you can treat, cure or prevent any disease. Please consult your health care professional for information on health care issues and do not stop any medications or courses of treatment, without first consulting your health care professional. The use of gemstones or minerals as a wellness therapy is one of personal choice. While stones or crystals have been used historically to relieve or prevent symptoms, the objects sold on our website offer no guarantee of results. Therefore, Catawiki cannot guarantee or be held liable for the effectiveness of these objects sold herein.
It is believed that certain gemstones and minerals have beneficial health and spiritual properties. However, using or wearing gemstones or minerals does not mean that you can treat, cure or prevent any disease. Please consult your health care professional for information on health care issues and do not stop any medications or courses of treatment, without first consulting your health care professional. The use of gemstones or minerals as a wellness therapy is one of personal choice. While stones or crystals have been used historically to relieve or prevent symptoms, the objects sold on our website offer no guarantee of results. Therefore, Catawiki cannot guarantee or be held liable for the effectiveness of these objects sold herein.
