Quartz small stones with inclusion on iron that create a bloody effect, semitransparent. Their size is approximately 0.5 -1.5 cm long , 0.5 -1 cm width and 0.5 -1 cm depth. 30 gr They can be used for jewelry making, wire wrapping, cabochon making ,craft making an Home Deco. Quartz is a hard, crystalline mineral composed of silicone and oxygen atoms. Is the second most abundant mineral in Earth. The word "quartz" is derived from the German word "Quarz"The Ancient Greeks referred to quartz as ?????????? (krustallos) derived from the Ancient greek ????? (kruos) meaning "icy cold", because some philosophers(including Theophrastus apparently believed the mineral to be a form of supercooled ice Quartz exist in two forms the crystal form which is is a Gem and the microcrystalized form ,more common.Each form of Quartz ,crystal or microcrystalized,has many varieties in base of their color Quartz is the mineral defining the value of 7 on the Mohs scale of hardness