geology ppt 007

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WELCOME
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CHAPTER -4 MINEROLOGY INTRODUCTION
MINERAL IS A NATURALLY AVAILABLE
MATERIAL
MINERALS FORMED USUALLY BY INORGANIC
PROCESS MINERALS ARE
THE BUILDING UNITS OF WHICH THE SOLID CRUST OF
THE EARTH IS MADE OF    
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• PROPERTIES OF COMMON MINERALS
• QUARTZ GROUP
• FELDSPAR GROUP
• PYROXENE GROUP
• AMPHIBOLE GROUP
• MICA GROUP
• CARBONATES
• GYPSUM
• CLAY MINERAL GROUP

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FELDSPAR FELDSPAR ARE THE MOST
IMPORTANT ROCK FORMING MINERALS THEY OCCURS
CHIEFLY IN IGNEOUS ROCKS (ABOUT 60) AND ALSO
AVAILABLE IN GOOD PROPORTION IN METAMORPHIC
ROCKS. FELDSPAR ALSO AVAILABLE IN SOME
SEDIMENTARY ROCKS
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• FELDSPAR GROUP
• ORTHOCLASE
• MICROLINE
• ALBITE
• ANORTHITE

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• ORTHOCLASE
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• COMPOSITION POTASSIUM ALLUMINIUM
  SLICATE,KAlSI3O3
• CRYSTAL SYSTEM MONOCLINIC
• CLEAVAGE TWO SETS OF PERFECT CLEAVAGE
• COLOURVARIOUS SHADES PF PINK AND RED
• STREAKWHITE
• FRACTUREUNEVEN
• LUSTUREVITREOUS TO SUB VITREOUS
• HABITSPRISMATIC CRYSTAL,CRYSTAL TWIN
• HARDNESS6-6.5
• SPECIFIC GRAVITY2.56-2.58
• OCCURENCEIGNEOUS ROCK
• GRANITES
• DIAGNOASTIC FEAUTERSWHITE TO PINK COLOUR WITH
  PERFECT CLEAVAGE PLANES
• USEAS A CREAMIC MATERIAL
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COMPOSITION ALLUMINIUM SLICATE
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CRYSTAL SYSTEM MONOCLINIC , TRICLINIC
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CLEAVAGE PERFECT CLEAVAGE
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(No Transcript)
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• 2.MICROLINE
• COMPOSITIONPOTASSIUM
  ALUMINIUM SILICATES,KAlSIO3
• CRYSTAL SYSTEMTRICLINIC
• CLEAVAGE PERFECT CLEAVAGE
• COLOUR BRIGHT GREEN ,CREAM WHITE
• STREAWHITE
• FRACTURE UNEVEN
• LUSTURE VITREOUS TO SUB VITREOUS
• HARDNESS6-6.5
• SPECIFIC GRAVITY2.54-2.57 OCCURRENCE
  IGNEOUS ROCK
• GRANITES
• DIAGNOSTIC FEATURES DISTINGUISHED FROM ORTHO
  CLASS BY ITS BRIGHT RED COLOUR
• VARIETIESANORTHOCLASE-IT CONTAINS ALSO SODIUM
  SILICATES
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STREAK WHITE STREAK COLOURLESS
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FRACTURE UNEVEN
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LUSTURE VITREOUS TO SUB VITREOUS
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HARDNESS
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Density and specific gravity
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HABITSPRISMATIC CRYSTAL,CRYSTAL TWIN
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• 3.ALBITE
• COMPOSITION SODIUM SALUMINIUM SILICATE WITH
  NaAlSI3O8,100-90 AND CaAl2SI2O8,0-10
• CRYSTAL SYSTEMTRICLINIC
• CLEAVAGEPRESENT IN TWO DIRECTIONS
• COLOURCOMMONLY WHITISHOR PINKISH WHITE BUT SHOWS
  SHADES OF GREY AND BLUE
• STREAK COLOURLESS
• LUSTREVITREOUS TO PEARLY
• HARDNESS6-6.5
• SPECIFIC GRAVITY2.60-2.62
• OCCURRENCEIGNEOUS ROCKS,SUCH AS GRANITES
• USES 1.AS A CERAMIC MATERIALS
• 2.AS AN ORNAMENTAL STONE IN POLISHED
  FORM
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CRYSTAL SYSTEM AND GROUPS
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• 4.ANORTHITE
• C0MPOSITION CaAl2SI2O8,100-90
• CRSTAL SYSTEMTRICLINIC
• CLEAVAGE PRSENT IN TWO DIRECTIONS
• COLOURGENERALLY WHITE MAY OCCURS IN REDDISH AND
  LIGHT GREY SHADE
• STREAKCOLOURLESS
• LUSTURESEMI VITREOUS
• OCCURRENCE AN IMPORTANT CONSTITUENT OF MANY
  BASIC TYPES OF IGNEOUS ROCKS
• USE AS IN ALBITE

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OCCURRENCE
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USES OF FELDSPAR
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THANK YOU