LPKW+4.1

toc

=4.1 Classifying Rocks=

Vocabulary

 * inorganic**-something that is not made out of living things
 * crystal**-The repeating pattern of a mineral particle forms a solid
 * element**-a substance that has only one kind of atom
 * compound**-two or more elements combined
 * Mohs hardness scale**-a scale that ranks ten minerals from hardest to softest
 * streak**-the color of a minerals powder
 * luster**-how the mineral reflects the light
 * cleavage**-the way a mineral breaks apart
 * fracture**-how a mineral breaks
 * fluorescence**-a property some minerals have that they glow under ultraviolet light

**4.1 Classifying rocks**

 * 1) **What is a mineral?**
 * //**Naturally occurring**//
 * a mineral must be naturally occurring
 * //**Inorganic**//
 * a mineral must be inorganic
 * means not from the materials once part of a living thing
 * //**Solid**//
 * a mineral must be a solid
 * //**Crystal structure**//
 * the patterns of a mineral repeat over and over again
 * //**Definite Chemical Composition**//
 * a mineral must have a definite chemical composition
 * means a mineral contains a certain element

**Identifying minerals**
* each mineral has different hardness
 * //**Hardness**//
 * they are rated by the Mohs hardness scale
 * //**Color**//
 * each mineral has a different color
 * **//Streak//**
 * the color of a mineral's powder
 * **//Luster//**
 * A mineral reflects light in a different way
 * **//Density//**
 * each mineral has a different weight in the same volume
 * **//Crystal Systems//**
 * each mineral has a different crystal structure
 * **//Cleavage and fracture//**
 * a mineral has a different color when broken
 * it also breaks in a different way
 * **//Special properties//**
 * some minerals have amazing properties