User:Anne181625/Topaz
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All edits I have made have been bolded. Some components of this article are well developed like the characteristics section. However, this article was lacking the mineralogical information about topaz so I have added that. The information could be reworked slightly to make it flow better however the article now has a more balanced distribution of information across multiple different topics.
Lead
Topaz | |
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General | |
Category | Nesosilicate minerals |
Formula (repeating unit) | Al2SiO4(F,OH)2 |
IMA symbol | Tpz[1] |
Strunz classification | 9.AF.35 |
Crystal system | Orthorhombic |
Crystal class | Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m) |
Space group | Pbnm |
Unit cell | a = 4.65 Å, b = 8.8 Å, c = 8.4 Å; Z = 4 |
Identification | |
Color | Colorless (if there are no impurities), white, blue, brown, orange, gray, yellow, yellowish brown, green, pink, reddish pink or even red |
Crystal habit | Prismatic crystal |
Twinning | Rarely on [111][2] |
Cleavage | [001] Perfect |
Fracture | Subconchoidal to uneven |
Mohs scale hardness | 8 (defining mineral) |
Luster | Vitreous |
Streak | White |
Diaphaneity | Transparent |
Specific gravity | 3.49–3.57 |
Optical properties | Biaxial (+) |
Refractive index | nα = 1.606–1.629 nβ = 1.609–1.631 nγ = 1.616–1.638 |
Birefringence | δ = 0.010 |
Pleochroism | Weak in thick sections X = yellow; Y = yellow, violet, reddish; Z = violet, bluish, yellow, pink |
Ultraviolet fluorescence | Short UV=golden yellow; Long UV=cream |
References | [3][4][5][6] |
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Topaz is a silicate mineral of aluminium and fluorine with the chemical formula Al2SiO4(F,OH)2. It is used as a gemstone in jewelry and other adornments. Common topaz in its natural state is colorless, though trace element impurities can make it pale blue or golden brown to yellow orange[7]. Topaz is often treated with heat or radiation to make it a deep blue, reddish-orange, pale green, pink, or purple. Although it is often associated with golden yellow and blue, it comes in a variety of colors, including colorless. The rarest are natural pinks, reds, and delicate golden oranges, sometimes with pink hues.[8]
Topaz is a nesosilicate mineral, and more specifically, an aluminosilicate mineral[9]. It is one of the hardest naturally occurring minerals and has a relatively low index of refraction. It has the orthorhombic crystal system and a dipyramidial crystal class.
-->It occurs in many places in the world. Some of the most popular places that topaz is sourced is razil and Russia[7]..
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