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Smoky quartz is a brownish grey, translucent variety of quartz that ranges in clarity from almost complete transparency to an almost-opaque brownish-gray or black crystals. [6] The color of smoky quartz is produced when natural radiation, emitted from the surrounding rock, activates color centers around aluminum impurities within the ...
Evidence suggests the color of citrine is linked to the presence of aluminum-based color centers in its crystal structure, similar to those of smoky quartz. [5] [6] Both smoky quartz and citrine are dichroic in polarized light and will fade when heated sufficiently or exposed to UV light. They occur in the same geological environments and can ...
An example of this is rose quartz. In Egypt, it was believed rose quartz could prevent aging, but the Romans used rose quartz as a seal to signify ownership, while in the Middle Ages it was used in healing potions, today rose quartz is known as the "love stone" and is used to balance emotions, and heal anger and disappointment. [17]
Quartz is, therefore, classified structurally as a framework silicate mineral and compositionally as an oxide mineral. Quartz is the second most abundant mineral in Earth's continental crust, behind feldspar. [9] Quartz exists in two forms, the normal α-quartz and the high-temperature β-quartz, both of which are chiral. The transformation ...
The first sunglasses, made from flat panes of smoky quartz called Ai Tai, meaning "dark clouds," [8] which offered no corrective powers but did protect the eyes from glare, were used in China in the 12th century or possibly earlier.
Quartz Quartz refers to a family of crystalline gemstones of various colours and sizes. Among the well-known types of quartz are rose quartz (which has a delicate pink colour), and smoky quartz (which comes in a variety of shades of translucent brown). Some other gemstones, such as Amethyst and Citrine, are also part of the quartz family.
Quartzite can have a grainy, glassy, sandpaper-like surface. Quartzite is a hard, non-foliated metamorphic rock which was originally pure quartz sandstone. [1] [2] Sandstone is converted into quartzite through heating and pressure usually related to tectonic compression within orogenic belts.
Herkimer diamonds are double-terminated quartz crystals discovered within exposed outcrops of dolomite in and around Herkimer County, New York, and the Mohawk River Valley in the US. [ 1 ] [ 2 ] They are not diamonds ; the "diamond" in their name is due to both their clarity and well-formed faces.