Fluorapatite
Alto Feio, Pedra Lavrada, Paraíba, Brazil
A 3.7 x 1.7 x 3.5 cm greenish-grey, single apatite crystal that exhibits 3 {100} faces and 1 {001} face, all of which are slightly frosted. The remainder of the crystal is bound by fracture surfaces. These are very transparent allowing the crystal interior, which is very gemmy, to be clearly seen. There are 6 incipient (001) cleavage surfaces. ...
© John Rakovan