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Describing MineralCharacteristics
Minerals
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What are minerals?
A mineral is a naturally occurring solid chemicalsubstance that is formed through geologicalprocesses and that has a characteristic chemicalcomposition, a highly ordered atomic structure,
and specific physical properties. By comparison,a rock is an aggregate of minerals and/ormineraloids and does not have a specificchemical composition.
Essentially Rocks are made from
Minerals therefore Minerals are the BuildingBlocks of life.
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Colour
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Sometimes, one mineral candisplay a number of colours.
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and polished
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Acid Test!
NO!!
Not that type of
Acid..
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This refers to the appearance of thesurface of the mineral.
Lustre
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Lustre
Metallic Lustre
Galena
Pyrite
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Adamantine
Diamond
Lustre
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Glassy (Vitreous)
Rose Quartz
Lustre
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Pearly
talc
Lustre
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Resinous
Amber
Lustre
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Waxy
Common Opal
Lustre
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Dull
Brucite
Lustre
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Earthy
Kaolinite
Lustre
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Streak
Oh Behave!
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Cleavage
Cleavage, is the tendency of crystallinematerials to split along definite planes,
creating smooth surfaces, of whichthere are several types.
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Cleavage
Perfect micaceous
Muscovite mica
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Cubic
Halite
Cleavage
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Fracture
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Fracture
Conchoidal
Sulfur
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Irregular (uneven)
Cinnabar
Fracture
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Hackly
Fracture
Native Copper
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Parting
Fracture
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Density
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Hardness
Hardness is measured using Mohs Scale
Finger Nail
(2.5)
Copper Coin
(3)
Steel Blade
(5.5)
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This refers to the natural shape createdwhen the crystal forms, it is dependenton the internal structure of the mineral.
Crystal Form
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Crystal Form
Six sided
Quartz
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Cubic
Fluorite
Crystal Form
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Octahedron
Magnetite
Crystal Form
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The shape created by crystal growthwhen unusual conditions force the
crystal from its natural form.
Mineral Habit
e.g. Pyrite Sun formedbetween layers of Shale.
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Mineral Habit
Acicular (needle-like)
Natrolite
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Botryoidal (grapelike)
Siderite
Mineral Habit
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Radiating
Brochantite
Mineral Habit
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Dendrytic
Psilomelane
Mineral Habit