earthmaterialsandprocesses-180722010152.pptx

N/A

1. EARTH MATERIALS AND PROCESSES

2. WHAT IS MINERAL? Rocks are composed of minerals. A mineral is a naturally occurring substance which is usually solid, crystalline, stable at room temperature and inorganic.

3. WHAT IS MINERAL? Minerals themselves are made up of one or more chemical elements with a definite chemical composition. Minerals cannot be broken down into smaller units with different chemical compositions in the way that rocks can

4. There are several different mineral properties which must be identified and defined. WHAT ARE THE PHYSICAL PROPERTIES OF MINERALS? 1. LUSTER – refers to how light is reflected from the surface of a mineral.

5. WHAT ARE THE PHYSICAL PROPERTIES OF MINERALS? LUSTER a. Metallic – generally opaque and exit a resplendent shine similar to a polished metal LUSTER a. Non-metallic – vitreous (glassy), adamantine (brilliant/diamond like), pearly, dull (earthy), greasy, among others

6. WHAT ARE THE PHYSICAL PROPERTIES OF MINERALS? 2. HARDNESS It is the ability of mineral to resist scratching. Friedrich Mohs, a German mineralogist, developed a hardness scale over 100 years ago. The hardest mineral known is Diamond, was assigned the number 10. it is called MOHS HARDNESS SCALE. It ranks the order of hardness of minerals and some common objects.

7. WHAT ARE THE PHYSICAL PROPERTIES OF MINERALS? 3. CRYSTAL FORM/HABIT refers to the characteristic shape of a mineral unit (either an individual crystal or a group of crystal).

8. WHAT ARE THE PHYSICAL PROPERTIES OF MINERALS? 4. COLOR One of the most obvious characteristic of a mineral, but generally not the most useful diagnostic feature. Minerals are colored because certain wave lengths of light are absorbed, and the color results from a combination of those wave lengths that reach the eye.