Search results
Results From The WOW.Com Content Network
Crystal quartz is a transparent crystalline variety of the mineral quartz, resembling glass. Job lists gavish (crystal quartz) alongside gold, onyx, lapis lazuli, glass, coral, and peridot as a valuable trade good. The Hebrew word gavish is a wanderwort, which probably originated in historical Nubia, modern Sudan.
The terms fused quartz and fused silica are used interchangeably but can refer to different manufacturing techniques, resulting in different trace impurities. However fused quartz, being in the glassy state, has quite different physical properties compared to crystalline quartz despite being made of the same substance. [2]
Unless stated otherwise, the properties of fused silica (quartz glass) and germania glass are derived from the SciGlass glass database by forming the arithmetic mean of all the experimental values from different authors (in general more than 10 independent sources for quartz glass and T g of germanium oxide glass). The list is not exhaustive.
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. [10] Quartz exists in two forms, the normal α-quartz and the high-temperature β-quartz, both of which are chiral. The transformation ...
Black vitreous fragments of fused sand that had been solidified by the heat of a nuclear explosion were created by French testing at the Reggane site in Algeria. [43] Following the atomic bombing of Hiroshima, it was discovered in 2016 that between 0.6% and 2.5% of sand on local beaches was fused glass spheres formed during the bombing. Like ...
To be clear, fused quartz is a type of glass. It's just glass with higher silica content than normal (ideally 100%).--Srleffler 15:31, 19 April 2006 (UTC) This page would be better renamed to fused silica (and the text adjusted accordingly). "Fused quartz" is a misnomer, and leads to confusion. Quartz is a crystal. Fused silica is a glass.
Fused and kiln-formed glass sculpture. Glass fusing is the joining together of pieces of glass at high temperature, usually in a kiln. [1] [2] This is usually done roughly between 700 °C (1,292 °F) and 820 °C (1,510 °F), [3] [4] and can range from tack fusing at lower temperatures, in which separate pieces of glass stick together but still retain their individual shapes, [5] to full fusing ...
Refractive index variation for SF11 flint glass, BK7 borosilicate crown glass, and fused quartz, and calculation for two Abbe numbers for SF11. The Abbe number, [ 1 ] V d , {\displaystyle V_{\mathsf {d}}\ ,} of a material is defined as