quartz crystal points - teaching student set of 12 from Brazil roughly 15 miles south of

roughly 15 miles south of Fallon and just west of US Highway 95

These clean sharp rhombs of colorless calcite are from the Challenger Cave system near Monterrey

inhibiting the formation of dacite

forming porcelanite

The silver

quartz crystal points - teaching student set of 12 from Brazil roughly 15 miles south ofQuartz is identified by its hardness, non metallic luster, translucency and faint horizontal striations on crystal faces. The striations may not appear on every face, and they range from faint to obvious, so a student will have to be observant. These are useful student specimens; each is transparent with a terminated end. Its interesting to see quartz points offered in 50 gram lots on the Internet. That sounds like a lot, but its just 1. 7 ounces, so