the case of the scarlett streak mineral identification l.
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foundation of understanding geology and geologic processes that affect us everyday ... academic.brooklyn.cuny.edu/geology/leveson/core/linksa/mineral_id...

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the case of the scarlett streak mineral identification

THE CASE OF THE SCARLETT STREAK:MINERAL IDENTIFICATION

Virginia T. McLemore

New Mexico Bureau of Geology and Mineral Resources

New Mexico Tech

what is a mineral3
What is a mineral?
  • naturally occurring
  • inorganic
  • solid
  • homogeneous
  • crystalline material
  • with a unique chemical element or compound with a set chemical formula
  • usually obtained from the ground
slide4

A crystal is composed of a structural unit that is repeated in three dimensions. This is the basic structural unit of a crystal of sodium chloride, the mineral halite.

why are minerals important6
Why are minerals important?
  • Identification of rocks
  • commodities that we use every day
  • foundation of understanding geology and geologic processes that affect us everyday
  • understanding geologic hazards
properties of minerals
Habit (Crystal forms and shapes)

Hardness

Cleavage

Streak

Color

Luster

Transparency

Twinning

Fracture

Specific Gravity

Associated Minerals

Fluorescence

Magnetism

Odor

Feel

Taste

Solubility

Reaction to acids

Radioactive minerals

Meteoritic minerals

Properties of minerals
hardness17
Hardness
  • ease or difficulty with which the mineral can be scratched
  • controlled by the strength of bonds between atoms
cleavage19
Cleavage
  • Way the mineral breaks or fractures
  • one direction of weakness, or in other minerals, 2, 3, 4, or as many as 6 may be present
  • determine the angular relation between the resulting cleavage surfaces
    • perpendicular
    • acute
    • obtuse
streak23
color of a mineral when it is powdered

crushing and powdering a mineral eliminates some of the effects of impurities and structural flaws

Black - Graphite

Black - Pyrite

Black - Magnetite

Black - Chalcopyrite

Gray - Galena

Limonite - Yellow-brown

Hematite - Red-brown

Streak
slide25

academic.brooklyn.cuny.edu/geology/leveson/core/linksa/mineral_id...academic.brooklyn.cuny.edu/geology/leveson/core/linksa/mineral_id...

luster27
way a mineral’s surface reflects light

metallic

earthy

waxy

greasy

vitreous (glassy)

adamantine (or brilliant, as in a faceted diamond)

Luster

From:geology.csupomona.edu/alert/mineral/minerals.htm

properties of minerals29
Habit (Crystal forms and shapes)

Hardness

Cleavage

Streak

Color

Luster

Transparency

Twinning

Fracture

Specific Gravity

Associated Minerals

Fluorescence

Magnetism

Odor

Feel

Taste

Solubility

Reaction to acids

Radioactive minerals

Meteoritic minerals

Properties of minerals
color
Color

From:geology.csupomona.edu/alert/mineral/minerals.htm

habit
Crystal shape

six crystal systems

governed by the mineral's internal structure

triclinic

monoclinic

orthorhombic

tetragonal

hexagonal

isometric

Habit

From:geology.csupomona.edu/alert/mineral/minerals.htm

specific gravity
Specific Gravity
  • specific gravity
    • ratio of mineral density to the density of water
  • similar to weight
  • density
    • ratio of the mass of a mineral to its volume
slide34

academic.brooklyn.cuny.edu/geology/leveson/core/linksa/mineral_id...academic.brooklyn.cuny.edu/geology/leveson/core/linksa/mineral_id...

slide35

academic.brooklyn.cuny.edu/geology/leveson/core/linksa/mineral_id...academic.brooklyn.cuny.edu/geology/leveson/core/linksa/mineral_id...