|
Chemical Classification |
Silicate |
|
Color |
Quartz occurs in virtually every color. Common colors are clear, white, gray, purple, yellow, brown, black, pink, green, red. |
|
Streak |
Colorless (harder than the streak plate) |
|
Luster |
Vitreous |
|
Diaphaneity |
Transparent to translucent. |
|
Cleavage |
None - |
|
Mohs Hardness |
7 |
|
Specific Gravity |
2.6 to 2.7 |
|
Diagnostic Properties |
Conchoidal fracture, glassy luster, hardness |
|
Chemical Composition |
SiO2 |
|
Crystal System |
Hexagonal |
|
Uses |
Glass making, abrasive, foundry sand, hydraulic fracturing proppant, gemstones |