1. QUARTZ

2. Quartz -one of the most useful natural materials due to its physical and chemical properties -most widely distributed mineral at earths surface -found in all parts of the world -Mohs scale is 7 -Chemical composition- one part silicon and two parts oxygen -crystal system- hexagonal

3. Physical properties of Quartz Color- almost every color- commons are clear white gray purple yellow brown black pink green and red Luster-vitreous Diaphaneity-transparent-translucent Cleavage- none ( breaks typically corchoidal fracture) Streak- white

4. Uses Glass making Abrasive Foundryscund Hydraulic fracturing Gemstone Very valuable in electronic products- because of its electrical property's

5. Questions? 1.What color is Quartz streak? A. white B. colorless C. black D. red 2.What colors is Quartz? A. white B. gray C. Brown D. all of the above 3.What part of the earth is it found on? A. Africa B. U.S. C. Asia D. all of the above