Friday Assignments due: Chapter 2 and 3 vocabulary Any worksheets from this week (final day for 80% credit) Article Report (final day for 80% credit) Access your webmail: vcs\first.last Email me: cbritt@vcs.k12.nc.us

Properties of Minerals On Monday we have a mineral identification lab. What is mineral identification? _____________the name of a mineral based on its ________________. In order to do that, today we will learn the properties of minerals! ___________and ______________determine the properties of a mineral.

2.3 Properties of Minerals Color 2.3 Properties of Minerals Small amounts of different elements can give the ________mineral __________colors. Color is __________________to identify a mineral as the same mineral can have different colors and many minerals can have the same colors.

2.3 Properties of Minerals Streak 2.3 Properties of Minerals Streak is the ____________of a mineral in its ______________form. To see the powdered form you “streak” the element onto a streaking plate.

2.3 Properties of Minerals Luster 2.3 Properties of Minerals Luster is used to describe how _______ ____________ from the surface of a mineral. If you hold up the mineral to the light is it: Shiny Dull ___________ Crystal-like ____________

Pyrite (Fool’s Gold) Displays Metallic Luster.

2.3 Properties of Minerals Crystal Form 2.3 Properties of Minerals Crystal form is the visible expression of a mineral’s _________arrangement of ____________. Did your sample develop in an open space? Can you see the crystal form?

Quartz Often Exhibits Good Crystal Form.

2.3 Properties of Minerals Hardness 2.3 Properties of Minerals  Hardness is a measure of the _______ of a mineral to being ___________.  ________scale consists of 10 minerals arranged from 10 (hardest) to 1 (softest).

Mohs Scale of Hardness

2.3 Properties of Minerals Hardness 2.3 Properties of Minerals  On Monday you will measure if your sample is harder or softer than a penny.  If my mineral leaves a mark on the penny, which is harder, the mineral or the penny?

2.3 Properties of Minerals Cleavage 2.3 Properties of Minerals  Cleavage is the tendency of a mineral to cleave, or _______, along ______, even surfaces.

Mica Has Cleavage in One Direction

2.3 Properties of Minerals Fracture 2.3 Properties of Minerals  Minerals that _______ show cleavage when broken are said to _______. Fracture—the _________breakage of a mineral The ___________________of an atom will determine whether a mineral will show cleavage or break in irregular fractures.

Conchoidal Fracture

2.3 Properties of Minerals Density 2.3 Properties of Minerals Density is a property of all matter that is the ______of an object’s _____to its _________. What is our formula for density? In order to distinguish between fool’s gold (pyrite) and real gold, jewelers measure the ___________.

2.3 Properties of Minerals Distinctive Properties of Minerals 2.3 Properties of Minerals Some minerals can be recognized by other _____________. Sulfur – smells like _____________ Talc – feels _________ Graphite – feels ____________ Metallic minerals – easily shaped Magnetite – magnetic Calcite - magnifying

Properties of Minerals Remember: __________________________ _____________________________________. That means that a mineral’s color, fracture, streak, luster, etc is all determined by it’s chemical composition (___________) and their structure.

Use your notes to answer the following: What determines the properties of a mineral? Which mineral property is the LEAST useful in helping to identify a mineral? Mohs scale is used to determine what property of minerals? Define cleavage. How are cleavage and fracture different?

Mineral Uses Webquest We use minerals ALL the time! You and a partner are going to find out how we use minerals using your computers. At least one partner in the group must have a computer and internet. All team members must fill out their own paper. Click here to get started! The front side is REQUIRED! To work on the back for extra credit, click here for the section labeled FIREWORKS and here for MINERAL GROUPS