  … is a naturally occurring, solid, with highly ordered atomic arrangement, homogeneous chemical composition.  Minerals are formed by inorganic processes.

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Presentation transcript:

  … is a naturally occurring, solid, with highly ordered atomic arrangement, homogeneous chemical composition.  Minerals are formed by inorganic processes Mineral…….

Physical Properties

  Magnetism  Radioactivity  Solubility in acids  Sensory tests “odour, taste or feel” Other diagnostic properties

  Silicates(most abundant): all contain the (Si) and (O) anions  Carbonates : al contain the (CO 3 ) 2- anion  Sulphates : all contain the (SO 4 ) 2-  Halides : all contain at least 1 halogen anion (F -,CL -, Br -, I - )  Oxides : all contain at least O 2- anion  Sulphides :all contain an S 2- anion  Phosphates: all contain the (PO 4 ) -3 Most Common Groups

  Olivine group  Garnet group  Aluminosilicate group  Humite group  Phenacite Nesosilicates

 GroupNesosilicates ColourYellowish green, olive green, greenish black or reddish brown Hardness6.5-7 StreakWhite LustreVitreous SystemOrthorhombic End membersForsterite (Fe 2 SiO 4 ) Fayalite (Mg 2 SiO 4 ) Monticellite(CaMg SiO 4 ) Kirschsteinite (CaFeSi0 4 ) Olivine

 Group ColourVariable with composition Hardness StreakWhite LustreVitreous to resinious Crystal SystemIsometric End membersPyrope, Almandine, Spessartine, Andradite, Grossular, Uvarovite, Hydrogrossular Garnet Group (Mg 2+,Fe 2+,Mn 2+,) 3 Al 2 Si 3 O 12 – Ca 3 (Fe 3+ Al 3+,Cr 3+ ) 2 Si 3 O 12

 Group Colour Hardness Streak Lustre Crystal System End membersSillimanite, Kynaite and Andalusite Aluminosilicate (Al 2 SiO 5 )

  Pyroxene group  Amphibole group  Pyroxenoid group Inosilicates group

 Group Inosilicates ColourBlack Hardness StreakBlack LustreGlassy or metallic SystemOrthorhombic or monoclinic End membersEnstatite, Ferrosilite, Diopside,hedenbergite Cleavage2 planes that meet at 90 degree Pyroxene(XYZ 2 O 6 ) X= Na +, Ca 2+, Mn 2+, Fe 2+, Mg 2+ and Li + Y= Mn2+,Fe2+Fe3+,Cr3+ and Ti4 + Z= Si 4+ and Al 3+

  Anthophyllite  Cummingtonite series  Tremolite series  Sodium amphibole Group Amphiboles

  Mica group  Serpentine group  Chlorite group  Clay mineral group Phyllosilicates

 GroupMica ColourBlack or brown to red Hardness2.5-3 StreakWhite LustreVitreous CleavagePerfect cleavage in one direction Biotite

 GroupClay ColourUsually white but other colours are known Hardness2 LustreDull earthy Crystal systemTriclinic Kaolinite

 GroupMica ColourSilver-white sheen Hardness2.5-4 StreakWhite LustrePearly, vitreous CleavagePerfect cleavage Muscovite

  Feldspar Group  K-feldspar  Plagioclase feldspar series  Feldspathoid group  Scapolite Tectosilicates

 Plagioclase

 Alkali feldspar  Microcline  Sanidine

  Orthoclase Alkali feldspar

 GroupSilicate ColourVariety of colors Hardness7 Specific gravity2.66 StreakWhite LustreVitreous Crystal systemHexagonal Quartz(SiO 2 )

  Calcite  Magnisite  Siderite  Rhodochrosite  Smithosonite  Aragonite  Dolomite Carbonates

 GroupCarbonates ColourVariety of colors Hardness3 Streakwhite, grey LustreVitreous, pearly Calcite (CaCo 3 )

 GroupCarbonates ColourColourless, white or brown Hardness3.5-4 StreakWhite LustrePearly, vitreous Crystal Systemtrigonal Dolomite CaMg(CO 3 ) 2

  Hematite group  Hematite  Corundum  Ileminte  Spinel group  Magnetite  Chromite  Gahnite  Spinel Oxides

 Hematite GroupHematite Group ColourRed to reddish brown Hardness5-6 StreakRed to brownish red LustreMetallic, submetallic Crystal SystemHexagonal

 Magnetite (Fe 2 +Fe 3+ 2 O 4 ) GroupSpinel ColourBlack to metallic silver grey Hardness Streakblack LustreMetallic, dull Crystal SystemCubic

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