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Sapphire deposit, Wutu, Changle County, Weifang, Shandong, Chinai
| Regional Level Types | |
|---|---|
| Sapphire deposit | Deposit |
| Wutu | Town |
| Changle County | County |
| Weifang | Prefecture-level City |
| Shandong | Province |
| China | Country |
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Latitude & Longitude (WGS84):
36° 34' 59'' North , 118° 54' 0'' East
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Tertiary olivine tholeiites with porphyritic texture and vesicular or amgydaloidal cavities that are usually filled with calcite, chlorite or analcime. The rocks contain lherzolite and websterite xenoliths, and also megacrysts of a variety of minerals including zircon, spinel, corundum, garnet and feldspar (anorthoclase).
Primary sapphires are located at a distance of 30 m from the mountaintop. The Fangshan gray–black sapphire-bearing basalt has developed a porphyritic texture and massive structure, with square and hexagonal columnar joints. Irregular horizontal joints are developed. At the bottom of the basalt sequence, the volume of enclaves is rather substantial, with many megacrystals and mantle-derived xenoliths. Megacrystals are mainly composed of olivine, pyroxene, corundum, spinel, titanium magnetite, etc., with a particle size of 0.5~4 cm. The xenoliths include peridotite and pyroxenite, with a particle size of 1~9 cm. There are visible traces of xenolith detachment on the rock wall.
Primary sapphires are located at a distance of 30 m from the mountaintop. The Fangshan gray–black sapphire-bearing basalt has developed a porphyritic texture and massive structure, with square and hexagonal columnar joints. Irregular horizontal joints are developed. At the bottom of the basalt sequence, the volume of enclaves is rather substantial, with many megacrystals and mantle-derived xenoliths. Megacrystals are mainly composed of olivine, pyroxene, corundum, spinel, titanium magnetite, etc., with a particle size of 0.5~4 cm. The xenoliths include peridotite and pyroxenite, with a particle size of 1~9 cm. There are visible traces of xenolith detachment on the rock wall.
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:
| ⓘ Albite Formula: Na(AlSi3O8) Description: Found as inclusions in megacrysts of corundum and anorthoclase. |
| ⓘ Albite var. Anorthoclase Formula: (Na,K)AlSi3O8 |
| ⓘ Albite var. Oligoclase Formula: (Na,Ca)[Al(Si,Al)Si2O8] Description: Found as inclusions in megacrysts of corundum and anorthoclase. |
| ⓘ Analcime Formula: Na(AlSi2O6) · H2O |
| ⓘ Calcite Formula: CaCO3 |
| ⓘ 'Chlorite Group' |
| ⓘ 'Clinopyroxene Subgroup' |
| ⓘ 'Columbite-(Fe)-Columbite-(Mn) Series' Description: Found as inclusions in corundum megacrysts. |
| ⓘ Corundum Formula: Al2O3 |
| ⓘ Corundum var. Sapphire Formula: Al2O3 Habit: trapiche Colour: white, blue, black Description: are all trapiche-like sapphires, with white “arms” developing around the core. Various sections of the samples were distinguished by visual observation. Detailed inspection of the raw stone reveals subtle changes in different zones. Further polishing made the phenomenon more visible. The arms are generally white, reaching from the mineral’s border to the center and aborting at the cores. The cores are substantially darker in color, typically dark blue or black, whereas the sectors are blue.
It is not a product of basaltic magma crystallization but is more likely derived from the lower crust and is classified as magmatic sapphire. |
| ⓘ 'Fayalite-Forsterite Series' |
| ⓘ 'Feldspar Group' References: |
| ⓘ 'Garnet Group' Formula: X3Z2(SiO4)3 |
| ⓘ 'Glass' Description: Also found as inclusions in corundum. |
| ⓘ 'Iddingsite' References: |
| ⓘ Ilmenite Formula: Fe2+TiO3 Description: Found as inclusions in corundum megacrysts. |
| ⓘ 'K Feldspar' Description: Found as inclusions in corundum. |
| ⓘ Magnetite Formula: Fe2+Fe3+2O4 Description: Found as inclusions in corundum. References: |
| ⓘ Magnetite var. Titanium-bearing Magnetite Formula: Fe2+(Fe3+,Ti)2O4 |
| ⓘ 'Olivine Group' Formula: M2SiO4 References: |
| ⓘ 'Plagioclase' Formula: (Na,Ca)[(Si,Al)AlSi2]O8 |
| ⓘ 'Pyroxene Group' Formula: ADSi2O6 References: |
| ⓘ Rutile Formula: TiO2 Description: Found as inclusions in corundum. |
| ⓘ Rutile var. Niobium-bearing Rutile Formula: (Ti,Nb)O2 Description: Found as inclusions in corundum. |
| ⓘ Spinel Formula: MgAl2O4 References: |
| ⓘ Zircon Formula: Zr(SiO4) |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Magnetite | 4.BB.05 | Fe2+Fe3+2O4 |
| ⓘ | Spinel | 4.BB.05 | MgAl2O4 |
| ⓘ | Magnetite var. Titanium-bearing Magnetite | 4.BB.05 | Fe2+(Fe3+,Ti)2O4 |
| ⓘ | Corundum | 4.CB.05 | Al2O3 |
| ⓘ | Ilmenite | 4.CB.05 | Fe2+TiO3 |
| ⓘ | Corundum var. Sapphire | 4.CB.05 | Al2O3 |
| ⓘ | Rutile | 4.DB.05 | TiO2 |
| ⓘ | var. Niobium-bearing Rutile | 4.DB.05 | (Ti,Nb)O2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
| Group 9 - Silicates | |||
| ⓘ | Zircon | 9.AD.30 | Zr(SiO4) |
| ⓘ | Albite | 9.FA.35 | Na(AlSi3O8) |
| ⓘ | var. Anorthoclase | 9.FA.35 | (Na,K)AlSi3O8 |
| ⓘ | var. Oligoclase | 9.FA.35 | (Na,Ca)[Al(Si,Al)Si2O8] |
| ⓘ | Analcime | 9.GB.05 | Na(AlSi2O6) · H2O |
| Unclassified | |||
| ⓘ | 'Chlorite Group' | - | |
| ⓘ | 'Feldspar Group' | - | |
| ⓘ | 'Iddingsite' | - | |
| ⓘ | 'Clinopyroxene Subgroup' | - | |
| ⓘ | 'Fayalite-Forsterite Series' | - | |
| ⓘ | 'Columbite-(Fe)-Columbite-(Mn) Series' | - | |
| ⓘ | 'Plagioclase' | - | (Na,Ca)[(Si,Al)AlSi2]O8 |
| ⓘ | 'K Feldspar' | - | |
| ⓘ | 'Pyroxene Group' | - | ADSi2O6 |
| ⓘ | 'Garnet Group' | - | X3Z2(SiO4)3 |
| ⓘ | 'Glass' | - | |
| ⓘ | 'Olivine Group' | - | M2SiO4 |
List of minerals for each chemical element
Other Regions, Features and Areas containing this locality
AsiaContinent
Eurasian PlateTectonic Plate
- North China CratonOrogen
- Eastern Block
- Longgang BlockShield
- Luxi BlockTerrane
- Eastern Block
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References
[1]Sun, Yumeng; Zhang, Liang; Yang, Liqiang; Li, Dapeng; Zhang, Yan; Li, Zengsheng; Chen, Guodong; Sun, Xiujin; Wang, Haoshuai; Wang, Yiqi (2024) Mineralogical Characteristics and Genesis of Trapiche-like Sapphire in Changle, Eastern North China Craton. Minerals, 14 (4). p.364. doi:10.3390/min14040364
Sapphire deposit, Wutu, Changle County, Weifang, Shandong, China