structure of minerals l.
Download
Skip this Video
Download Presentation
Structure of Minerals

Loading in 2 Seconds...

play fullscreen
1 / 6

Structure of Minerals - PowerPoint PPT Presentation


  • 290 Views
  • Uploaded on

Structure of Minerals. All minerals are crystalline The atoms are arranged in a regular pattern A crystal is a regular geometric solid with smooth surfaces called crystal faces The orderly arrangement of ions determines the shape of the crystal. Crystal Structure.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Structure of Minerals' - gilon


Download Now An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
structure of minerals
Structure of Minerals
  • All minerals are crystalline
  • The atoms are arranged in a regular pattern
  • A crystal is a regular geometric solid with smooth surfaces called crystal faces
  • The orderly arrangement of ions determines the shape of the crystal.
crystal structure
Crystal Structure
  • Each kind of mineral has its own crystal form.
  • Halite (NaCl) typically forms a crystal in the shape of a cube
  • Quartz (SiO2) may form long, regular six sided crystals.
  • The angles at which crystal faces meet is always the same for each kind of mineral.
  • To describe these shapes crystallographic axes are used. They are drawn perpendicular to crystal faces.
silica tetrahedron
Silica Tetrahedron
  • More than 90% of the minerals in Earth’s crust are members of a mineral family called silicates.
  • They are compounds of silicon and oxygen plus one or more metallic element such as aluminum or iron
  • In all silicates the basic building block is four O atoms packed closely around a Si atom, held together by covalent bonds.
  • The basic unit forms a silica tetrahedron
  • Silicates are classified according to the way the tetrahedrons are linked. Fig 3.16 p. 40
crystals and physical properties
Crystals and Physical Properties
  • The orderly arrangement of the atoms or ions helps explain the other properties of the mineral.
  • A mineral is a solid because of the close packing of its ions or atoms and the strong forces of attraction between them
  • The hardness of a mineral depends on the arrangement of its ions or atoms
  • Carbon forms diamond, the hardest natural mineral.
  • Carbon also forms graphite, a very soft mineral that flakes easily
  • Carbon atoms are arranged in layers or sheets in the graphite structure.
diamond and graphite
Diamond and Graphite

Diamond structure