amethystred jaspercrystalturquoiseaventurineblue lacetigers eyehematitenew jaderose quartzgoldstonesodaliteplease give a light discription of all of them. thanks this will be a great help! :DD
It can only be dangerous if you throw it at someone. I have a piece of petrified wood from the Windgate formation in southern Utah. It is mostly brown with black streaks. The black is uraninite, (aka uranium oxide) but even the radioactive mineral does not give off enough radiation to be dangerous. Dont over think it, your smoky quartz probably was irradiated (either naturally or artificially) but neither the silica, oxygen nor trace metals are radioactive.
Quartz is the most ubiquitous mineral on the planet. It's almost impossible to find a rock that doesn't have quartz in it. Any list of minerals that it occurs with would only be partial. As far as parent rock, it is usually a granite or granite-type. You might start with microcline okorderite, and tourmalines -- especially elbaite, wolframite, pyrite, rutile, zeolites, fluorite, calcite, gold, muscovite, topaz, beryl, hematite and spodumene. The presence of small quantities of radioactive minerals in the parent rock is what irradiates the rock and gives it its characteristic smokey color. This is also a good reason to buy from a reputable source, because a store manager can simply take a random piece of normal and cheap quartz, sit it next to a radiation source (not hard to obtain) for a few hours, maybe overnight, and then sell it as a more valuable mineral crystal.
