Knowra Quartz Quartz Quartz is a crystalline mineral composed of silicon dioxide (SiO₂). Its hardness, chemical stability, and range of crystal forms make it common in rocks and useful in technology.
Silicon dioxide : Silicon dioxide is a chemical compound of silicon and oxygen, occurring in crystalline and amorphous forms. Quartz is the crystalline mineral form of this compound.
Crystal habit : Crystal habit is the characteristic external shape in which a mineral commonly grows. Quartz often develops six-sided prisms capped by pyramid-like faces.
Quartz clock : A quartz clock keeps time using the stable oscillation of an electrically driven quartz resonator. Its timing circuit exploits quartz’s piezoelectric resonance.
Silica cycle : The silica cycle describes the movement of dissolved and solid silicon through rocks, water, organisms, and sediments. Quartz weathers, dissolves, and reprecipitates as silicon moves through Earth systems.
Silicate minerals : Silicate minerals are minerals built from silicon–oxygen tetrahedra, alone or linked into larger structures. Quartz shares silicon and oxygen chemistry with silicates but has a distinct framework structure.
Crystal twinning : Crystal twinning occurs when two or more crystals share a systematic orientation relationship. Twinned quartz crystals can form recognizable intergrowths and alter optical behavior.
Quartz crystal microbalance : A quartz crystal microbalance measures tiny mass changes through shifts in a quartz resonator’s frequency. Deposited material changes the oscillation frequency of a quartz crystal.
Pegmatite : Pegmatite is an exceptionally coarse-grained igneous rock, commonly formed from water-rich residual magma. Pegmatites can host large, well-formed quartz crystals.
Crystal structure : A crystal structure is the ordered, repeating arrangement of atoms, ions, or molecules in a crystalline solid. Quartz’s repeating atomic arrangement determines its symmetry and physical properties.
Amethyst : Amethyst is the purple variety of quartz, colored mainly by irradiation-related defects involving iron. Its color demonstrates how trace impurities and defects modify otherwise colorless quartz.
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