Macrophotograph of a small portion of a Cactus quartz (a.k.a. Spirit quartz) crystal cluster with purple amethyst. The orange coloration is due to iron oxidation and small iron inclusions can be seen in the matrix of many of the crystals. From the Magaliesberg Mountains of South Africa. Image #4115 3097 X 4693 pixels
Macrophotograph of a Stone Canyon rock slab; a combination of brecciated jasper in an agate matrix; from California Image #4092 4800 X 3200 pixels
Closeup photograph of a Dugway geode whose cavity is lined with quartz crystals; Dugway Geode Beds, Utah Image #4118 6144 X 4912 pixels
