Coesite | |
Chemical Formula |
SiO2 |
Species |
Silicates |
Crystal System |
Monoclinic |
Mohs Scale |
7-8 |
Color |
Colorless |
Streak |
white |
Luster |
Vitreous |
Refractive Index |
n = 1.593 - 1.599 n = 1.597 - 1.604 |
Diaphaneity |
Transparent |
Cleavage |
Poor/IndistinctSuspected on |
Fracture |
Sub-Conchoidal |
Crystal Habit:Inclusions in UHP metamorphic minerals up to 3 mm in size | |
Geological Setting:Formed at pressures > 20 kbar. Impact craters, kimberlites, eclogites. |