Section 2.2 NotesSection 2.2 Notes. Color is the most obvious property of a mineral; however it is also the least reliable.Color is the most obvious property.

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Presentation transcript:

Section 2.2 NotesSection 2.2 Notes

Color is the most obvious property of a mineral; however it is also the least reliable.Color is the most obvious property of a mineral; however it is also the least reliable. Determine the color of a mineral by observing the sample with the unaided eye and noting its overall color.Determine the color of a mineral by observing the sample with the unaided eye and noting its overall color.

The streak of a mineral is identified by firmly rubbing a mineral sample against an unglazed porcelain tile and observing the color of its streak.The streak of a mineral is identified by firmly rubbing a mineral sample against an unglazed porcelain tile and observing the color of its streak.

Determine the luster of a mineral by observing how light reflects off its surface.Determine the luster of a mineral by observing how light reflects off its surface. Looks like metal = MetallicLooks like metal = Metallic Does not look like metal = NonmetallicDoes not look like metal = Nonmetallic

These terms describe the way a mineral breaks.These terms describe the way a mineral breaks. If a mineral fractures, it breaks along rough edges.If a mineral fractures, it breaks along rough edges. If it cleaves, then it breaks along smooth, flat surfaces.If it cleaves, then it breaks along smooth, flat surfaces.

Determine the hardness of a mineral by using Moh’s hardness scale.Determine the hardness of a mineral by using Moh’s hardness scale. Fingernail = 2.5Fingernail = 2.5 Penny (1982 or earlier) = 3.0Penny (1982 or earlier) = 3.0 Steel nail = 5.5Steel nail = 5.5

Some minerals have unique properties that enable us to determine their identities.Some minerals have unique properties that enable us to determine their identities. TasteTaste MagnetismMagnetism EffervescenceEffervescence BirefringenceBirefringence FluorescenceFluorescence

Birefringence or Twinning

Fluorescence

Mineral Properties wulfenite colororange streakwhite lusternonmetallic cleavageyes density 6.9 hardness 3