mineral (see pictures below). It has a vitreous (glassy) luster, pinkcolor, and you can see two distinct
cleavage angles. You cannot scratch it with a copper penny nor glass plate, but you can scratch it with
a steel nail. The sample you found is particularlyneat, but you also notice that the granite rocks around
you have a lot of this mineral in them. What is the name of this mineral? How did it form?
Fig: 1