The most important tool in the forensic soil scientists toolbox.
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Becke Line Method
A technique in optical mineralogy that helps determine the relative refractive index of two materials.
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Dusty dry soils
Tend to be light tan or white owing to lack of moisture.
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Humus
Collective organic fraction of soil.
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Fracture match
________; where glass can be individualized to a particular object.
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Soil
Earth material, either natural or man-made (concrete, gravel, other building materials), that is transferred from a crime scene to a person or object, or vice versa.
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Radial Cracks
Will form on the side of the glass opposite to the side of the impact.
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high speed projectile
When a(n) ________, such as a bullet, passes through a piece of glass, a crater will form in the glass that is larger on the exit side of the glass.
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Glass
An amorphous solid; a hard, brittle material that is usually transparent, but which lacks the ordered arrangement of atoms.
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Flat glass
Used to make windows and windshields and can also be shaped to form light bulbs, headlights, and other materials.
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Concentric Cracks
Fractures forming in an approximately circular pattern around the point of impact.
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Borosilicate Glass
Used in cookware, thermometers, and automobile headlights because it can take fast, extreme changes in temperature without cracking or shattering.
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Particle analysis
The key to understanding the nature of the samples under examination.
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Soil
________ contains both organic and inorganic materials.
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Common glass
made up largely of oxides of silicons that have been doped with other materials to give it its familiar properties
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Float glass
made by pouring the molten glass from a furnace into a chamber that contains a bed of molten tin
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Soda Lime Glass
made when calcium oxide and sodium carbonate are added
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Borosilicate Glass
used in cookware, thermometers, and automobile headlights because it can take fast, extreme changes in temperature without cracking or shattering
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Tempering
a process whereby the glass is heated and cooled rapidly, producing deliberate stress in the surface
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Flat glass
used to make windows and windshields and can also be shaped to form light bulbs, headlights, and other materials
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Container glass
used to make bottles and drinking glasses
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Glass Refractive Index Measuring Instrument (GRIM)
used in most forensic science laboratories to determine the refractive index of small glass particles
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Radial Cracks
will form on the side of the glass opposite to the side of the impact
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