KGMK+4.1

toc =4.1 properties of minerals=

vocabulary

 * inorganic:**a mineral that is made of non live materials
 * crystal:**the same particles which form a crystal
 * element:**has only one atom
 * compound**:has two or more element in it
 * mohs hardness scale**:scores ten minerals by softest to hardest
 * streak:**the color of the power it leaves behind
 * luster:**what color the minerals tun when the suns light hits it
 * cleavage:**if it can break apart easily
 * fracture:**what the crack looks like
 * fluorescence:**what happens to the mineral when they put it under fluorescence lights.



What Is a Mineral?

 * There are over 3000 minerals that scientists have discovered.
 * About 20 minerals make most of the Earths Crust.
 * These types of minerals are known as rock-forming minerals.

Naturally Occurring

 * Minerals have to be inorganic.
 * this means that minerals can't come back from materials that were once alive.
 * Geologists do not classify coal as a mineral for it comes from living material that had lived millions of years ago.

Inorganic

 * minerals can't come back from materials that were once alive.
 * coal may form naturally, but Geologists doesn't classify coal as a mineral for it comes from remains of living material that lived millions of years ago.

Solid

 * minerals are always a solid, with a type of shape and a definite volume.
 * particles that make a sold, a solid are packed together very tightly.
 * so they aren't aloud to move freely like the particles that make up a liquid.
 * solids keep their shape instead of changing its all because the particles can't flow freely.