EARTH-AND-LIFE-SCIENCE-2.pptx FOR REPORTING

This presentation is made by my classmate which is used for her reporting in the subject called Earth & Life Science. I Hope you find this useful

1. 1. COLORS 2. STREAK 3. HARDNESS 4. CLEAVAGE 5. CRYSTALLINES STRUCTURE 6. DIAPHANEITY 7. LUSTER 8. TENACITY

2. Colors is readily observable and certainly obvious, but it is usually less reliable than other physical properties. Streak The colour of a mineral is what you see when light reflects off the surface of the sample. One reason that colour can be so variable is that the surface textures variable.

3. Hardness One of the most important diagnostic properties of a mineral is its hardness. In practical terms, hardness determines whether or not a mineral can be scratched by a particular material. In 1812 German mineralogist Friedrich Mohs came up with a list of 10 minerals representing a wide range of hardness, and numbered them 1 through 10 in order of increasing hardness.

4. Cleavage is what we see when a mineral breaks along a plane or planes. Crystalline structure/ habit When minerals form within rocks, there is a possibility that they will form in distinctive crystal shapes if they are not crowded out by other pre-existing minerals. GREEN CRYSTAL SKELETAL HALITE CRYSTAL

5. Diaphaneity/ amount of transparency Mineral’s ability to transmit light. For example, some minerals are transparent. When they are thick, a small amount of distortion may occur, but light passes relatively freely through them. CALCITE MUSCOVITE CINNABAR

6. Luster is the way light interacts with the surface of a crystal, rock, or mineral. The word traces its origins back to the Latin lux, meaning "light", and generally implies radiance, gloss, or brilliance. Tenacity Refers to a mineral's toughness or resistance to breaking or being deformed .

7. 6 CHARACTERISTICS OF TENACITY

8. Brittle - Minerals such as halite, calcite and fluorite are brittle, as their molecules are held together by weak ionic bonds. Therefore, these minerals shatter when they're struck. FLOURITE Malleability is the quality of something that can be shaped into something else without breaking. GOLD

9. Ductility is the physical property of the metal which means if we pull the metal it's going to stretch rather than break. A mineral can be stretched into wire. Flexible but I nelastic If it does not return to its original position, but retains the position it was given after being bent then it is flexible but inelastic. Soapstone

10. Flexible but Elastic If a flexible mineral will return to its original position after stress is released, then it is flexible and elastic. Mica Sectilit y is the ability of a mineral to be cut into thin pieces with a knife. MUSCOVITE