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Quartz

quartz

(Science: chemical) A form of silica, or silicon dioxide (SiO2), occurring in hexagonal crystals, which are commonly colourless and transparent, but sometimes also yellow, brown, purple, green, and of other colours; also in cryptocrystalline massive forms varying in colour and degree of transparency, being sometimes opaque.

The crystalline varieties include: amethyst, violet; citrine and false topaz, pale yellow; rock crystal, transparent and colourless or nearly so; rose quartz, rosecoloured; smoky quartz, smoky brown. The chief crypto-crystalline varieties are: agate, a chalcedony in layers or clouded with different colours, including the onyx and sardonyx; carnelian and sard, red or flesh-coloured chalcedony; chalcedony, nearly white, and waxy in luster; chrysoprase, an apple-green chalcedony; flint, hornstone, basanite, or touchstone, brown to black in colour and compact in texture; heliotrope, green dotted with red; jasper, opaque, red yellow, or brown, coloured by iron or ferruginous clay; prase, translucent and dull leek-green. Quartz is an essential constituent of granite, and abounds in rocks of all ages. It forms the rocks quartzite (quartz rock) and sandstone, and [[mak 478 es]] most of the sand of the seashore.

Origin: G. Quarz.


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Re: Theories - Origin of Life

Jackbean. Where did I say that oxygen formed from Quartz or Feldspar? It didn’t and that is my argument. Please read what I am writing. The oxygen must have been around in the compounds that formed the rocks according to the theory of accretion. For ...

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by scottie
Mon Oct 03, 2011 10:12 pm
 
Forum: Evolution
Topic: Theories - Origin of Life
Replies: 559
Views: 761981

Re: Theories - Origin of Life

What does chemistry tell us? We have rocks, made up of granite. Granite consists of different amounts of Quartz (SiO2) Feldspar of which there are three kinds (KAlSi2O2, CaAlSi2O2, and NaAl2Si2O2), and Mica (every Mica molecule contains 12 Oxygen atoms (O2). Limestone and Marble ...

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by JackBean
Mon Oct 03, 2011 4:07 pm
 
Forum: Evolution
Topic: Theories - Origin of Life
Replies: 559
Views: 761981

Re: Theories - Origin of Life

... will cost you to read the entire article) What does chemistry tell us? We have rocks, made up of granite. Granite consists of different amounts of Quartz (SiO2) Feldspar of which there are three kinds (KAlSi2O2, CaAlSi2O2, and NaAl2Si2O2), and Mica (every Mica molecule contains 12 Oxygen atoms ...

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by scottie
Wed Sep 28, 2011 2:35 pm
 
Forum: Evolution
Topic: Theories - Origin of Life
Replies: 559
Views: 761981

UltraBright UV transilluminator

... of said transilluminator is either having a UV lamp with very well defined peak emission purely in the UV range or that it has a wonderful quartz filter that make sure that only the UV go through. Nice but dangerous if you want my opinion because it can stay, unprotected w/o anyone noticing ...

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by canalon
Fri Oct 15, 2010 1:35 pm
 
Forum: Molecular Biology
Topic: UltraBright UV transilluminator
Replies: 17
Views: 14880

How to clean rust on objective lens

... of the objective lens surface. I know acid can clean it, but that will damage the mount. Any good idea for this? Objective lens should be made by quartz glass.

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by flyingmelon
Sat Sep 18, 2010 9:16 am
 
Forum: General Discussion
Topic: How to clean rust on objective lens
Replies: 2
Views: 1925
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