"MINERAL PHOTO GALLERY"
galena
Galena

Chemical Name: PbS (lead Sulfide)
Colour: Metallic Grey
Streak: Dark Grey
Specific Gravity: 7.2 - 7.6
Cleavage: Perfect
Fracture : Conchoidal
sphalerite
Sphalerite

Chemical Name: ZnS (zinc Sulfide)
 Colour: Yellow, Yellow-Brown, Black to Brown
 Streak: None
 Specific Gravity: 3.9 - 4.2
 Cleavage: Complete
 Fracture: Conchoidal
topaz
Topaz

Chemical Name: Al2(SiO4)(F,OH)2 (aluminum hydroxy fluro silicate)
 Colour: Blue, Orange, Clear, Yellow, Red, Pink or Violet
 Streak: White
 Specific Gravity: 3.5 - 3.6
 Cleavage: Perfect Basal
 Fracture: Conchoidal
The following is just an example of what you can get your students to do as the activity.  This can be done as a poster or a Webpage.

The following information and images were taken from:
www.theimage.com

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