logging in or signing up minerals halko.geo Download Post to : URL : Related Presentations : Let's Connect Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Copy embed code: Embed: Flash iPad Dynamic Copy Does not support media & animations Automatically changes to Flash or non-Flash embed WordPress Embed Customize Embed URL: Copy Thumbnail: Copy The presentation is successfully added In Your Favorites. Views: 3339 Category: Science & Tech.. License: All Rights Reserved Like it (2) Dislike it (2) Added: February 16, 2008 This Presentation is Public Favorites: 1 Presentation Description physical properties of minerals Comments Posting comment... By: alocogringo (67 month(s) ago) I would really like to show this to my special education science group. They are learing about minerals and this is a great demonstration. They are seventh graders and would really appreciate it. Michael Gilpin MS 343 Bronx, NY Saving..... Post Reply Close Saving..... Edit Comment Close Premium member Presentation Transcript Physical Properties of Minerals: Physical Properties of Minerals **The physical properties of a mineral are a DIRECT result of the INTERNAL ARRANGMENT OF ATOMS.** Some properties are more useful then others to determine what a mineral is. However rarely is one physical property enough to identify a mineral. The following are the main physical properties used to identify mineralsColor: Color Color is the LEAST useful physical property It is the least useful for two reasons: More than one mineral can be a certain color 2 Samples of the same mineral can have different colors! Slide3: Each of these minerals has a different color yet all are QUARTZSlide4: Both of these minerals are green, however the one on the left is Olivine, and the one on the right is Malachite These are examples of why color is the WORST identifying characteristic.Streak: Streak Streak is the color of a mineral in powder form. The powder forms when the mineral is rubbed against a rough surface. An unglazed ceramic tile is used as the rough surface. Some minerals have a distinct streak color, however most leave a clear streak. This limits the usefulness of the test. However it is more reliable then color alone, because each mineral leaves the same colored streak regardless of the color of the sampleLuster: Luster The way in which a mineral reflects light is its luster. There are two types of luster: Metallic: Minerals shiny like polished metal. Nonmetallic Don’t shine like polished metal, and are sometimes described as glassy, pearly, dull and earthy.Metallic Luster: Metallic Luster Two Examples:Nonmetallic Luster: Nonmetallic Luster A few Examples: Hardness: Hardness Hardness is a measure of a minerals resistance to being scratched. This is one of the KEY means of identifying a mineral It also determines how quickly a mineral is broken up by weathering. The hardness of a mineral is tested using Moh’s Hardness scale, a penny, your finger nail, a glass plate, and a nail.Moh’s Hardness Scale: Moh’s Hardness ScaleCleavage: Cleavage Cleavage is the tendency of a mineral to split along certain flat surfaces, or planes of cleavage. Cleavage can occur in one or more planes. Cleavage is caused when weak bonds in a mineral are split apart.Cleavage in One Direction: Cleavage in One Direction The classic example of cleavage in one direction is Mica. The mineral breaks in to flat sheets.Cleavage in 2 Directions: Cleavage in 2 Directions Orthoclase is the classic example of cleavage in 2 directions. Cleavage in three Directions: Cleavage in three Directions Halite is the classic example of cleavage in 3 directions at right angles It breaks into cube shaped pieces. Fracture: Fracture Some minerals do not break along nice flat planar surfaces. This type of breakage is called fracture.Special Properties:: Special Properties: Some minerals display properties that no other minerals display. These traits are: Magnetism bubbling in acid double refraction of light or polarization (creates 2 images from 1) A mineral may magnify an image below it. Powdered form may bubble in acid You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.