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The case of the scarlett streak mineral identification l.jpg

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 l.jpg
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 l.jpg

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 important l.jpg
Why are minerals important? in three dimensions. This is the basic structural unit of a crystal of sodium chloride, the mineral halite.


Why are minerals important6 l.jpg
Why are minerals important? in three dimensions. This is the basic structural unit of a crystal of sodium chloride, the mineral halite.

  • Identification of rocks

  • commodities that we use every day

  • foundation of understanding geology and geologic processes that affect us everyday

  • understanding geologic hazards


Slide8 l.jpg

NEW MEXICO MINING: WHERE ARE THE DEPOSITS? in three dimensions. This is the basic structural unit of a crystal of sodium chloride, the mineral halite.






Slide13 l.jpg

Metals districts with Significant deposits of reserves).in New Mexico



Properties of minerals l.jpg

Habit (Crystal forms and shapes) that allow for their identification.

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


Hardness l.jpg
Hardness that allow for their identification.


Hardness17 l.jpg
Hardness that allow for their identification.

  • ease or difficulty with which the mineral can be scratched

  • controlled by the strength of bonds between atoms


Cleavage l.jpg
Cleavage that allow for their identification.


Cleavage19 l.jpg
Cleavage that allow for their identification.

  • 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


Slide20 l.jpg

www.ironorchid.com/minerals/ that allow for their identification.


Slide21 l.jpg

From:geology.csupomona.edu/alert/mineral/minerals.htm that allow for their identification.


Streak l.jpg
Streak that allow for their identification.


Streak23 l.jpg

color of a mineral when it is powdered that allow for their identification.

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


Slide24 l.jpg

From:geology.csupomona.edu/alert/mineral/minerals.htm that allow for their identification.


Slide25 l.jpg

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


Luster l.jpg
Lusteracademic.brooklyn.cuny.edu/geology/leveson/core/linksa/mineral_id...


Luster27 l.jpg

way a mineral’s surface reflects lightacademic.brooklyn.cuny.edu/geology/leveson/core/linksa/mineral_id...

metallic

earthy

waxy

greasy

vitreous (glassy)

adamantine (or brilliant, as in a faceted diamond)

Luster

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


Slide28 l.jpg

www.ironorchid.com/minerals/academic.brooklyn.cuny.edu/geology/leveson/core/linksa/mineral_id...


Properties of minerals29 l.jpg

Habit (Crystal forms and shapes)academic.brooklyn.cuny.edu/geology/leveson/core/linksa/mineral_id...

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 l.jpg
Coloracademic.brooklyn.cuny.edu/geology/leveson/core/linksa/mineral_id...

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


Habit l.jpg

Crystal shapeacademic.brooklyn.cuny.edu/geology/leveson/core/linksa/mineral_id...

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 l.jpg
Specific Gravityacademic.brooklyn.cuny.edu/geology/leveson/core/linksa/mineral_id...

  • 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 l.jpg

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


Slide35 l.jpg

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


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