We picked our rocks that we wanted to polish and we researched them. The rock that I picked was called labradorite, as shown down below.
- The chemical formula for labradorite is: (Ca,Na)(Al, Si)4O8
- The mohs scale (the hardness) : 6-6.5
- Tenacity: Brittle
- Makes up 60% of earths crust.
- 3 directions of cleavage
- Labradorite is most commonly found in Labrador, Canada.
"Labradorization is the peculiar reflection of the light from submicroscopical planes orientated in one direction (rarely in two directions) ; these planes have never such a position that they can be expressed by simple indices, and they are not directly visible under the microscope."