Presentation (1).pptx
- 3. • INTRODUCTION • TYPES • ORGIN • OCCURRENCE • USES OUTLINE
- 4. INTRODUCTION • Syenite is a coarse-grained intrusive igneous rock. • With a general composition similar to that of granite, but deficient in quartz, • Which, if present at all, occurs in relatively small concentrations (< 5%).
- 5. • “Clinopyroxene, hornblende, biotite mica, or olivine may be present in minor proportions”
- 6. Based on the composition the SYENITE is classified into 1. ALKALIC SYENITE 2. NEPHELINE SYENITE 3. CALC SYENITE NEPHELINE SYENITES
- 7. • Granite is a common type of felsic (acidic) intrusive igneous rock and can be predominantly white, pink, or gray in color, depending on mineralogy. Granite contains between 20% and 60% quartz by volume, and at least 35% of the total feldspar consisting of alkali feldspar. • Granite is a common type of felsic (acidic) intrusive igneous rock and can be predominantly white, pink, or gray in color, depending on mineralogy. • Granite contains between 20% and 60% quartz by volume, and at least 35% of the total feldspar consisting of alkali feldspar. • Syenite is a coarse-grained intrusive igneous rock with a general composition similar to that of granite, but deficient in quartz (i.e. <5%) • The feldspar component of syenite is predominantly alkaline in character (usually orthoclase). Plagioclase feldspars may be present in small proportions, less than 10%. The difference between SYENITE and GRANITE GRANITE SYENITE