alkali feldspar वाक्य
उदाहरण वाक्य
मोबाइल
- In the alkali feldspar almost pure albite domains are observed.
- Less quartz content would lead to " quartz alkali feldspar syenite ".
- They are angular intergrowths of quartz and alkali feldspar.
- Minerals in the tonalite are quartz, plagioclase, alkali feldspar and hornblende.
- Alkali feldspar may be present in minor amounts.
- The alkali feldspar is confined to the groundmass.
- Alkali feldspar dominates, commonly represented by orthoclase and the exsolved lamellar albite, form perthite.
- Dark rounded alkali feldspars, typically one centimeter or less in diameter, dominate this rock.
- If the rock has a greater percentage of alkali feldspar, it grades into a syenite.
- More than 90 % of the total feldspar content is in the form of alkali feldspar.
- Riebeckite-granites have close affinities to aplites, shown especially in the prevalence of alkali feldspars.
- Crystal twinning is common in feldspars, especially polysynthetic twins in plagioclase and Carlsbad twins in alkali feldspars.
- As shown in the QAPF diagram, alkali feldspar granite contains between 20 %-60 % quartz.
- Granite is classified according to the QAPF diagram for coarse grained petrologic convention contains both plagioclase and alkali feldspars.
- In the case of the alkali feldspar minerals, thin white albite layers will alternate between typically pink microcline.
- The alkali feldspar may have unusual compositions unlike any terrestrial feldspar, and they are often Ba-rich.
- When a granitoid is devoid or nearly devoid of plagioclase, the rock is referred to as alkali feldspar granite.
- "' Nepheline syenite "'is a holocrystalline plutonic rock that consists largely of nepheline and alkali feldspar.
- They consist of quartz, plagioclase, orthoclase or alkali feldspar, rare mafics ( pyroxene ), and rare zircon.
- Perthite is an intergrowth of alkali feldspar of intermediate composition : the coarseness of perthitic intergrowths is related to cooling rate.
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