minerals
DESCRIPTION
IT ALL ABOUT MINERALS THEIR CHEMICAL AND PHYSICAL PROPERTIES.TRANSCRIPT
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PREPAID BY:- GROUP :C•RAJ KRUNAL•SHAH APURVA•PATHARIYA SARASWATI
CIVIL ENGINEERINGSIGMA INSTITUTE OF ENGINEERING
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TOPICS TO BE COVERD
INTRODUCTION
PHYSICAL PROPERTIES OF MINERALS
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INTRODUCTION
MINERAL-: A naturally occurring homogeneous substance which has a more or less definite atomic structure .
MINERAL
ROCK FORMING MINERALS
ORE FORMING MINERALS
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PHYSICAL PROPERTIES OF MINERALS
Determine by simple test.
Useful on field for recognizing.
Identification by polarizing microscope by cutting minerals into thin slices and passing polarized light to pass through them.
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PHYSICAL PROPERTIES OF MINERAL ARE:-
1) COLOURS 9)TENACITY
2) STREAK 10)MAGNETISM
3) LUSTRE 11)FLUORESCENCE
4) HARDNESS 12)SPECIFIC GRAVITY
5) HABIT 13)FORM
6) CLEAVAGE
7) FRACTURE
8) FEEL
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COLOURS Absorption of the certain
wave lengths of light by atoms making up the crystal.
Colour and appearance in light depends upon the composition and structure of the substance.
Phenomenon shown by minerals:-
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a) PLAY OF COLOURS:- It is the development of series of prismatic colour shown by some on turning them in light. E.g.: Diamond
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b) CHANGE OF COLOURS:-It is similar to play of colour except that the rate of change of colour on rotation is rather low. E.g.: Plagioclase Feldspar.
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c)IRIDESCENCE: Some minerals shows rainbow colours either in their exterior or in the interior surface.E.g.:-Limonite.
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STREAK The colour
of mineral powder is called the streak.
Obtained by rubbing the mineral against an unglazed porcelain plate , called the “streak plate”, .
Important in case of coloured minerals which often give a much lighter streak the their original body colour .
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LUSTURE The way of mineral, which
reflect the light from its surface and may define as shine of mineral.
There are two types of lusture:-
1)Metallic lusture
2)Non-metallic lusture
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METALLIC LUSTURE
NON-METALLIC LUSTURE
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HARDNESS Define as the resistance of a
mineral to scratching or abrasion.
Hardness is determined by rubbing a mineral of unknown hardness against one of known hardness.
Obtained by using “mohs scale of hardness". It can also be obtained by 1)scratch with finger nails , 2)a penknife, 3)penny
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FINGER NAILS PENNY
BY KNIFE
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HABIT “Habit” of a mineral may be
define as the size and shape of the crystals, and the structure or form shown by the crystal.
1)Accicular :- Minerals showing needle like crystals.
E.g.:-Natrolite.
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2)Fibrous:-Minerals showing an aggregate of long thin fibers. E.g.:-Asbestos.
3)Tabular:-Minerals showing bladed habit occur as small knife blades.E.g.:-Kyanite.
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4)Granular:-Minerals which occur as aggregate of equidimensional grains.E.g.:-Chromites.
5)Pisolitic:-Minerals which occur as aggregates of rounded grains of a pea size. E.g.:-Bauxite.
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6)Botryoidal:-Minerals showing aggregate of rounded masses resembling bunch of grapes. E.g.:-Chalcedony.
7)Columnar:-Minerals showing columnar crystals.
E.g.:- Tourmaline.
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CLEAVAGE The tendency of a mineral to break
more easily with smooth surfaces along planes of weak bonding.
It is the property which is related to the atomic arrangement within the mineral. For E.G.:-Mica,Galena,Calcite.
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Mica has basal cleavage.
Calcite has rhombohedral cleavage.
Galena has cubic cleavage.
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FRACTURE
The way a mineral breaks when it does not yield along cleavage or parting surface , it is called Fracture.
Fracture are neither linear nor parallel.
CONCHOIDAL FRACTURE
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EVEN FRACTURE:- Fracture surface which is almost flat.
UNEVEN FRACTURE:- Fracture surface which is irregular or rough.
E.g.:DUMORTIERITE
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Minerals can be identified by how they break. Obsidian (left), although not a mineral because of its lack of crystal structure, shows excellent conchoidal fracture. Asbestos (right), which is the common name for several minerals that form thin, threadlike structures, is an example of a mineral with fibrous fracture.
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FEEL Feel is the sensation upon touching or
handling minerals .the different types of feel are “greasy” , “soapy”, “rough” , and “harsh” .
Talc has “greasy” feel.
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Kaolin has “Soapy” feel.
Bauxite has “Rough” feel.
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TENACITY
Tenacity of mineral denotes the degree or character of cohesion.
Tenacity is classified as follows:-
1)Sectile:-Mineral which may be cut with knife but slices are not malleable.
ORPIMENT
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2)Malleable:-Minerals which flatten under the hammer.
GOLD
3)Flexible:-Minerals which may be bent.
GYPSUM
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MAGNETISM
A few minerals are attracted by magnet . Of these minerals magnetite and pyrrhotite are the most common examples. The magnetite that possesses attracting power and polarity is called “Lodestone”.
MAGNETITE
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FLUORESCENCE
Some minerals when exposed in sunlight or ultraviolet light, produce a colour quit different from their own. Thus green or colourless fluorite shows a blue or purple colour in ultraviolet light. This property of minerals is called “Fluorescence”.
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GREEN FLUORITE
SHOWS BLUE OR PRPULE COLOUR
IN SUNLIGHT
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SPECIFIC GRAVITY
“Specific gravity” is a number which represents the ratio of the weight of a mineral to the weight of an equal volume of water. Thus a mineral with specific gravity 4.0 is four times as heavy as water.
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FORM
The internal atomic arrangement of a mineral is manifested outwardly by development of geometrical shapes of crystal structure.
CALCIT INTERNAL CRYSTAL STRUCTURE
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COMPARISION OF MINERALSMINERALS PYRITE HEMATITE
FORMULA FeS2 Fe3O3
IMAGE
COLOUR BRASS YELLOW REDDISH BROWN OR BLACK
LUSTURE METALLIC METALLIC TO DULL
STREAK GREENISH OR BROWNISH BLACK
DARK RED
HARDNESS 6-6.5 5-6
HABIT COMMON FORMS ARE THE CUBE
CRYSTALS THIN TABULAR
USE MANUFACTURE OF SULFURIC ACID
AS IRON ORE,AS PIGMENT
CLEVAGE - ABSENT
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MINERAL MAGNETITE BAUXITE
FORMULA Fe3O4 Al2O3
IMAGE
COLOUR IRON BLACK WHITE,GRAY,YELLOW,BROWN
LUSTURE METALLIC TO DULL DULL EARTHY
STREAK BLACK YELLOW TO BROWN
HARDNESS 6 2-2.5
HABIT OCTAHEDRAL CRYSTAL,MASSIVE OR GRANULAR
PISOLITIC
USE IMPORTANT ORE OF IRONAS ABRASIVE MATERIAL,IMPORTANT ORE OF ALUMINIUM
CLEVAGE ABSENT ABSENT
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MINERAL GYPSUM DOLOMITE
FORMULA CaSO4.2H2O CaMg(CO3)2
IMAGE
COLOUR COLOURLESS,WHITE,GREY,RED OR BROWN
WHITE,GRAY TO PINK
LUSTURE USUALLY VITREOUS VITREOUS TO PEARLY
STREAK WHITE WHITE
HARDNESS 2 3.5-4
HABIT TABULAR,FIBROUS,GRAN-NULAR.
CRYSTAL SHOW CURVED FACES
USE POP , AS FERTILIZER AS BUILDING & ORNAMENTAL STONE
CLEAVAGE PERFECT PERFECT ON RHOMBOHEDRAL CLEAVAGE
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MINERAL CALCITE GRAPHITE
FORMULA CaCO3 C
IMAGE
COLOUR USUALLY WHITE TO COLOURLESS
IRON BLACK TO STEEL GRAY
LUSTURE VITREOUS METALLIC ,EARTHY
STREAK WHITE BLACK
HARDNESS 3 1-2
HABIT CRYSTALLINE,TABULAR,GRANULAR
USE MANUFACTURE OF CEMENT AND LIME.
STEEL MAKING,LUBRICANTS
CLEVAGE PERFECT WITH 74 55’ PERFECT
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MINERAL CHALCOCITE GALENA
FORMULA Cu2S PbS
IMAGE
COLOUR DARK GRAY TO BLACK LEAD GRAY AND SILVER
LUSTURE METALLIC BRIGHT METALLIC
STREAK SHINY BLACK TO LEAD GRAY
LEAD GRAY
HARDNESS 2.5-3 2.5
HABIT SHORT PRISMATIC CRSTAL,MASSIVE
OFTEN CUBIC CRYSTAL,MASSIVE
USE IMPROTANT ORE OF COPPER
IMPORTANT ORE OF LEAD AND SILVER
CLEAVAGE POOR PERFECT CUBIC
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REFERENCE:- BOOK:”PRINCIPLES OF ENGINEERING
GEOLOGY”
by,” B.M BANGAR”
GOOGLE IMAGES.
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