Difference between revisions of "Blue topaz"
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== Description == | == Description == | ||
| − | A blue variety of [[topaz]] used as a gemstone. Naturally occurring blue topaz is very rare. The blue color can be | + | A blue variety of [[topaz]] used as a gemstone. Naturally occurring blue topaz is very rare. The blue color can be artificially induced in clear topaz crystals by irradiation followed by heat. Blue topaz has often been confused with [[aquamarine]]. |
== Synonyms and Related Terms == | == Synonyms and Related Terms == | ||
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topaze bleue (Fr.); topázio azul (Port.) | topaze bleue (Fr.); topázio azul (Port.) | ||
| − | == | + | ==Physical and Chemical Properties== |
| − | Orthorhombic system with mostly prismatic crystals. Perfect cleavage in one direction. | + | * Orthorhombic system with mostly prismatic crystals. |
| − | + | * Perfect cleavage in one direction. | |
| − | Fracture = subconchoidal and uneven. Luster = vitreous. Streak = colorless to white. | + | * Fracture = subconchoidal and uneven. |
| − | + | * Luster = vitreous. | |
| − | Yellow topaz turns a soft red when heated. | + | * Streak = colorless to white. |
| + | * Yellow topaz turns a soft red when heated. | ||
{| class="wikitable" | {| class="wikitable" | ||
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|- | |- | ||
! scope="row"| Density | ! scope="row"| Density | ||
| − | | 3.4-3.6 | + | | 3.4-3.6 g/ml |
|} | |} | ||
| − | == | + | ==Resources and Citations== |
* ''Encyclopedia Britannica'', http://www.britannica.com | * ''Encyclopedia Britannica'', http://www.britannica.com | ||
| − | + | * Minerals.net at https://www.minerals.net/mineral/topaz.aspx | |
| + | * Geology.com at https://geology.com/gemstones/blue-topaz/ | ||
[[Category:Materials database]] | [[Category:Materials database]] | ||
Latest revision as of 15:44, 8 May 2022
Description
A blue variety of Topaz used as a gemstone. Naturally occurring blue topaz is very rare. The blue color can be artificially induced in clear topaz crystals by irradiation followed by heat. Blue topaz has often been confused with Aquamarine.
Synonyms and Related Terms
topaze bleue (Fr.); topázio azul (Port.)
Physical and Chemical Properties
- Orthorhombic system with mostly prismatic crystals.
- Perfect cleavage in one direction.
- Fracture = subconchoidal and uneven.
- Luster = vitreous.
- Streak = colorless to white.
- Yellow topaz turns a soft red when heated.
| Mohs Hardness | 8.0 |
|---|---|
| Density | 3.4-3.6 g/ml |
Resources and Citations
- Encyclopedia Britannica, http://www.britannica.com
- Minerals.net at https://www.minerals.net/mineral/topaz.aspx
- Geology.com at https://geology.com/gemstones/blue-topaz/