pegmatite造句
1. These give rise to pegmatites, very coarse-grained rocks that may include crystals as much as several meters across.
2. Pegmatite is a coarse type of granite that can be found in dikes or veins.
3. As with other mines containing pegmatite rocks, Brazilian Alexandrite is found in rugged areas that can be difficult to access.
4. The local Pegmatite was introduced into the body mud of stoneware basing on research, analysis, and process test. The resources were exploited, the cost of production was decreased.
5. At pegmatite contacts the composition changes to chalcopyrite, millerite, pyrite, and accompanied by magnetite and hematite.
6. Chrysoberyl in some granite pegmatite is a rare mineral that seldom seen in Altatic area [Sentence dictionary], and it is a valuable precious stone.
7. Ores are of pegmatite granites texture, graphic and massive, banded structure.
8. Following the sparse Alexandrite veins through pegmatite rock with hand dug trenches, open pits and small tunnels, mining was very primitive to say the least.
9. Spodumene is a typical kind of pegmatite, which forms mainly in the ore vein of granite-pegmatite.
10. At pegmatite contacts the composition changes to chalcopyrite, millerite, pyrite, and violarite accompanied by magnetite and hematite.
11. In addition, mineral assemblage and gabbro similar to gabbro pegmatite; and nepheline syenite nepheline syenite rock similar pegmatite and so on.
12. African Alexandrite is typically located in wet regions near rivers and mined by digging through river beds by hand to unearth the Alexandrite rich pegmatite rock.
13. A great quantity of fluid-melt inclusions was found in early-stage formed fluorite and quartz from aegirine-augite-barite pegmatite vein and carbonatite vein in Mianning REE deposit of Sichuan.
14. There is high tantalite grade for certain large scale granite - pegmatite pattern tantalite - columbite mine in our country.
15. The diabase and lamprophyre are typical mantle source rock while the granite pegmatite is typical crustal source rock.
16. Beside fractional crystallization model, liquid immiscibility of Fluorine-rich granite magma is an important mechanism to form pegmatite and pegmatite type deposit.
17. Li - Be - Ta - Nb - bearing deposits in Lianyun Mountain on thewing of Lianyun Mountain anticline the densely distributed pegmatite area.
18. Malipo emerald deposit in Yunnan Province has two types of pegmatite vein and greisen vein.
19. The research on geochemical characteristics and isotope age suggests that the deposit belongs to a magma-metasomatic pegmatite type deposit related to Fufang and Huitong granitic mass in genesis.
20. The research of compositions of fluid-melt inclusions indicates that the genesis of Altai pegmatite was close ties with magmatic-hydrothermal transitional stage.
21. Nepheline is a typical kind of alkaline mineral, which forms mainly in alkaline deposit and its pegmatite.
22. Fenitization is well developed around the carbonatite complex which is composed of various sizes of carbonatite, alkali basic pegmatite, lamprophyre, granite porphyry , and dia base dikes.