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Wegeltena, Delanta Woreda, North Wollo Zone, Amhara Region, Ethiopiai
| Regional Level Types | |
|---|---|
| Wegeltena | Town |
| Delanta Woreda | District |
| North Wollo Zone | Zone |
| Amhara Region | Region |
| Ethiopia | Country |
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Latitude & Longitude (WGS84):
11° 35' 35'' North , 39° 12' 56'' East
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Other/historical names associated with this locality:
(Wegel Tena); Wogeltena
Other Languages:
French:
Wegel Tena, Semien Wollo, Amhara, Éthiopie
Simplified Chinese:
沃格爾特納, 北沃洛地區, 阿姆哈拉州, 埃塞俄比亚
Wegeltena (also known as Wegel Tena; Amharic: ወገል ጠና), is the main town and administrative center of Delanta woreda (district).
Located at 3,000 m high on the Ethiopian Plateau, which is conformed by a succesion of Oligocene volcanic materials including opal-bearing rhyolitic ignimbrite.
Half dozen of active large mining areas (Alwat, Koke Woha, Tirtrya, Minch, Gelbate and Nech Gedel) and countless small diggings around the town are worked looking for precious opal.
Located at 3,000 m high on the Ethiopian Plateau, which is conformed by a succesion of Oligocene volcanic materials including opal-bearing rhyolitic ignimbrite.
Half dozen of active large mining areas (Alwat, Koke Woha, Tirtrya, Minch, Gelbate and Nech Gedel) and countless small diggings around the town are worked looking for precious opal.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
9 valid minerals.
Rock Types Recorded
Select Rock List Type
Alphabetical List Tree DiagramDetailed Mineral List:
| ⓘ 'Alkali Feldspar' |
| ⓘ Goethite Formula: Fe3+O(OH) |
| ⓘ Graphite Formula: C Description: "graphitic carbon" inclusions in opal. |
| ⓘ Hematite Formula: Fe2O3 |
| ⓘ Hollandite Formula: Ba(Mn4+6Mn3+2)O16 Description: Ba-bearing Mn oxide, probably hollandite, inclusions in opal. |
| ⓘ Manganite Formula: Mn3+O(OH) |
| ⓘ Opal Formula: SiO2 · nH2O |
| ⓘ Opal var. Opal-CT Formula: SiO2 · nH2O Fluorescence: white or bluish‐white |
| ⓘ Opal var. Precious Opal Formula: SiO2 · nH2O |
| ⓘ Pyrite Formula: FeS2 Description: Microscopic inclusions in opal. |
| ⓘ Pyrolusite Formula: Mn4+O2 |
| ⓘ Quartz Formula: SiO2 |
| ⓘ Quartz var. Chalcedony Formula: SiO2 |
| ⓘ 'Smectite Group' Formula: A0.3D2-3[T4O10]Z2 · nH2O |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Graphite | 1.CB.05a | C |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Goethite | 4.00. | Fe3+O(OH) |
| ⓘ | Hematite | 4.CB.05 | Fe2O3 |
| ⓘ | Quartz var. Chalcedony | 4.DA.05 | SiO2 |
| ⓘ | 4.DA.05 | SiO2 | |
| ⓘ | Opal | 4.DA.10 | SiO2 · nH2O |
| ⓘ | var. Precious Opal | 4.DA.10 | SiO2 · nH2O |
| ⓘ | var. Opal-CT | 4.DA.10 | SiO2 · nH2O |
| ⓘ | Pyrolusite | 4.DB.05 | Mn4+O2 |
| ⓘ | Hollandite | 4.DK.05a | Ba(Mn4+6Mn3+2)O16 |
| ⓘ | Manganite | 4.FD.15 | Mn3+O(OH) |
| Unclassified | |||
| ⓘ | 'Alkali Feldspar' | - | |
| ⓘ | 'Smectite Group' | - | A0.3D2-3[T4O10]Z2 · nH2O |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Goethite | Fe3+O(OH) |
| H | ⓘ Manganite | Mn3+O(OH) |
| H | ⓘ Opal | SiO2 · nH2O |
| H | ⓘ Opal var. Precious Opal | SiO2 · nH2O |
| H | ⓘ Smectite Group | A0.3D2-3[T4O10]Z2 · nH2O |
| H | ⓘ Opal var. Opal-CT | SiO2 · nH2O |
| C | Carbon | |
| C | ⓘ Graphite | C |
| O | Oxygen | |
| O | ⓘ Quartz var. Chalcedony | SiO2 |
| O | ⓘ Goethite | Fe3+O(OH) |
| O | ⓘ Hematite | Fe2O3 |
| O | ⓘ Hollandite | Ba(Mn64+Mn23+)O16 |
| O | ⓘ Manganite | Mn3+O(OH) |
| O | ⓘ Opal | SiO2 · nH2O |
| O | ⓘ Pyrolusite | Mn4+O2 |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Opal var. Precious Opal | SiO2 · nH2O |
| O | ⓘ Smectite Group | A0.3D2-3[T4O10]Z2 · nH2O |
| O | ⓘ Opal var. Opal-CT | SiO2 · nH2O |
| Si | Silicon | |
| Si | ⓘ Quartz var. Chalcedony | SiO2 |
| Si | ⓘ Opal | SiO2 · nH2O |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Opal var. Precious Opal | SiO2 · nH2O |
| Si | ⓘ Opal var. Opal-CT | SiO2 · nH2O |
| S | Sulfur | |
| S | ⓘ Pyrite | FeS2 |
| Mn | Manganese | |
| Mn | ⓘ Hollandite | Ba(Mn64+Mn23+)O16 |
| Mn | ⓘ Manganite | Mn3+O(OH) |
| Mn | ⓘ Pyrolusite | Mn4+O2 |
| Fe | Iron | |
| Fe | ⓘ Goethite | Fe3+O(OH) |
| Fe | ⓘ Hematite | Fe2O3 |
| Fe | ⓘ Pyrite | FeS2 |
| Ba | Barium | |
| Ba | ⓘ Hollandite | Ba(Mn64+Mn23+)O16 |
Other Databases
| Wikipedia: | https://en.wikipedia.org/wiki/Wegeltena |
|---|---|
| Wikidata ID: | Q3567075 |
Other Regions, Features and Areas containing this locality
AfricaContinent
- East African Rift System (EARS)Zone (Tectonic)
African PlateTectonic Plate
- Arabian-Nubian Shield
- Nakfa TerraneVolcanic Arc
This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to
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References
Rondeau, Benjamin, Fritsch, Emmanuel, Mazzero, Francesco, Gauthier, Jean-Pierre, Cenki-Tok, Bénédicte, Bekele, Eyassu, Gaillou, Eloïse (2010) Play-of-Color Opal from Wegel Tena, Wollo Province, Ethiopia. Gems & Gemology, 46 (2) 90-105 doi:10.5741/gems.46.2.90
Chauviré, Boris; Rondeau, Benjamin; Mazzero, Francesco; Ayalew, Dereje (2017) The Precious Opal Deposit At Wegel Tena, Ethiopia: Formation Via Successive Pedogenesis Events. The Canadian Mineralogist, 55 (4). p.701-723. doi:10.3749/canmin.1700010
Chauviré, Boris, Rondeau, Benjamin, Alexandre, Anne, Chamard-Bois, Sarah, La, Carole, Mazzero, Francesco (2019) Pedogenic origin of precious opals from Wegel Tena (Ethiopia): Evidence from trace elements and oxygen isotopes. Applied Geochemistry, 101. 127-139 doi:10.1016/j.apgeochem.2018.12.028
Ayalew, Dereje, Pik, Raphael, Gibson, Sally, Yirgu, Gezahegn, Ali, Seid, Assefa, Dereje (2020) Pedogenic origin of Mezezo opal hosted in Ethiopian Miocene rhyolites. The Canadian Mineralogist, 58 (2). 231-246 doi:10.3749/canmin.1900059
Wegeltena, Delanta Woreda, North Wollo Zone, Amhara Region, Ethiopia