The picture of rose quartz in this link.
Some of the properties of quartz are: Hardness around 7, this is pretty hard. It is capable of scratching most other minerals, in fact it can scratch steel and steel cannot scratch it to give you some perspective. No cleavage. Quartz has instead conchoidal fracture. What this means is it tends to break into uneven yet curved surfaces much like if you broke a pane of glass. It can form various gems. Certain impurities and compositions of quartz can form different gems. Amethyst is a variety of quartz, so is rose quartz, citrine, agate, onyx, jasper and other gems. Quartz is very abundant, it is the second most abundant mineral in the earths CRUST. The most abundant is plagioclase feldspars. It is the clear, glassy mineral in granite, most sand is quartz, it often forms in hydrothermal veins to make beautiful crystals, etc.
