Faden Quartz Twin A307

Quartz is a silicon dioxide mineral belonging to the Quartz group. Quartz is the most abundant mineral on Earth, found in most geological environments and a component in most rock types. Quartz varieties include microcrystalline Chalcedony types (each variety has its own page); and macrocrystalline Quartz types, which is clear in its purest form. Impure varieties include Amethyst, Citrine, Smokey Quartz and the massive variety Rose Quartz (each variety has its own page).

Quartz, also known as Rock Crystal, is further named after the growth types Phantom, Faden, Double Terminated; locality Tibetan Black, Herkimer Diamond; inclusions Rutile, Tourmalinated; artificial coatings Aqua Aura, Opal Aura; and synthetic production Siberian Blue, Green; and that's to name but a few (each has its own page).

Faden Quartz is the name given to the formation of included fibrous fuzzy white 'threads' within a Quartz crystal (often tabular). The fibres can be from a millimetre to 30 millimetres thick, and most often straight and perpendicular to the termination.