Minerals Characteristics of Minerals Minerals are n Naturally
- Slides: 18
Minerals Characteristics of Minerals
Minerals are… n Naturally occurring (not man made) Yes - Diamonds No – Cubic Zirconia
Minerals are… n Inorganic (non-living) From non-living carbon Mineral From carbon of plants Not a mineral
Minerals are… n Solid – definite volume, definite shape
Minerals are… n Solid – definite volume, definite shape n Definite chemical (fixed) composition A mineral always contains certain elements in definite proportions
Minerals have… n Crystal structure – a repeating pattern of particles
Write a definition for a mineral A mineral is…
Write a definition for a mineral A mineral is a naturally occurring, inorganic solid with a crystal structure and a definite chemical composition.
Solid Naturally Occurring Inorganic Composition Element or Compound
Identifying Minerals n Color
Identifying Minerals Color n Streak – color of the mineral as a powder n - we use a streak plate (unglazed porcelain) to create the powder How do we perform a Streak test everyday? Using a pencil.
Identifying Minerals n Luster – how light reflects off the surface of a mineral Metallic (like metal) Nonmetallic – glassy, waxy, greasy, pearly, dull, silky, earthy
Identifying Minerals n Density – mass per unit volume density= mass/volume
Identifying Minerals n Density – mass per unit volume density= mass/volume Mass = 72 g Volume = 9 cm 3 Density = ? 8 g/cm 3 n Hardness – how easily a mineral can be scratched Moh’s Scale Softest (1) - Hardest (10)
Mohs Hardness Scale
Identifying Minerals n Crystal systems cubic tetragonal hexagonal orthorhombic monoclinic triclinic
Identifying Minerals n Breakage Cleavage - breaks along flat surfaces Fracture – breaks in an irregular way
Identifying Minerals n Special Properties Magnetic (magnetite) Optical properties (some calcite) Fizzes with HCl (calcite) Taste (halite) Smell (sulfur)
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- Characteristics of minerals
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