Dims: 7.7 x 6.4 x 0.2" (19.6 x 16.3 x 0.5 cm)
Wt: 13.0 oz. (368 g)
Minas Gerais, Brazil
This large specimen consists of a cut and polished slice of a Quartz geode. Just beneath the sparse, dull, pale brown skin of the geode is a layer of banded agate approximately 1.2" (3 cm) in thickness. The agate occurrs in layers, some of which have a reddish-brown coloration. The other layers are essentially coloress and not quite transparent. Inside of the agate layer is a layer of colorless, crystalline Quartz that is approximately 1.1" (2.8 cm) thick. It is also colorless and transparent, though its tendencies cannot really be studied. The core of the geode is made up of alternating layers of white agate and more crystalline Quartz, and a druse of tiny crystals rests in a slight depression at the center.