This citrine is from Diamantina in the Jequitinhonha Valley in Minas Gerais, Brazil. This area contains 28 different mineral species and there are many quartz bearing deposits which are mined for specimens. This is a natural, unheated and unpolished citrine quartz crystal. Quartz is a silicate containing the elements Si and O. In pure form the crystals are colorless. It can be found in a variety of colors which can be caused by trace impurities in the crystal lattice or by natural irradiation. This is a transparent crystal with internal veiling, a smokey-citrine color and a glass luster. It is double terminated and it is free from all matrix. The former attachment point appears to have been a contact area with other crystals. This specimen is a large miniature that measures 2 1/4 x 1 x 7/8 inches or 57 x 25 x 22 mm.