Wikipedia

Amarantite: Difference between revisions

Browse history interactively
← Previous edit
Content deleted Content added
VisualWikitext
Ij735 (talk | contribs)
15 edits
No edit summary
punct
Tags: Mobile edit Mobile web edit Advanced mobile edit
 
(35 intermediate revisions by 20 users not shown)
Line 4:
| boxbgcolor =
| image = Amarantite - Javir-e-Sagand, Yazd Province, Iran.jpg
| imagesize =
| alt =
| caption =
| category =
| formula = Fe<sup>3+</sup><sub>2</sub>[O{{pipe}}(SO<sub>4</sub>)<sub>2</sub>]·7H<sub>2</sub>O
| strunz = ▼
| dana = ▼
| symmetry = ▼
| unit cell = V 674.09 ų (Calculated from Unit Cell)
| molweight =
▲| strunz =
| color = Amaranth-Red to Brownish Red, Orange-Red▼
▲| dana =
| system = triclinic▼
▲| symmetry =
▲| color = Amaranth-Red to Brownish Red, Orange-Red
| colour =
| habit =
▲| system = triclinic
| twinning =
| cleavage = Perfect on {010} and {100}, perfect.
| fracture =
| tenacity = Brittle
| mohs = 2½
| luster = Vitreous
| streak = Lemon-Yellow
| diaphaneity = Transparent
| gravity =
| density = 2.189 - 2.286 g/cm<sup>3</sup>
| polish =
| opticalprop =
| refractive =
| birefringence =
| pleochroism = Visible
| 2V =
| dispersion =
| extinction =
Line 48 ⟶ 50:
| prop1 =
| prop1text =
| references =
}}
 
'''Amarantite''' is an [[amaranth]]-red to brownish mineral<ref name=mindat /> with the general formula of Fe<sup>3+</sup><sub>2</sub>[O|(SO<sub>4</sub>)<sub>2</sub>]·7H<sub>2</sub>O.<ref>Giacovazzo C., Menchetti S. (1968) - Dati strutturali sulla amarantite. Periodico di mineralogia – Roma, pp. 727-731</ref> The name comes from the Greek word αμάραντος which means amaranth, an imaginary undying red flower, in allusion to its color.<ref>Zeitschrift für Kristallographie: 127: 261-275</ref>
 
Amarantite is triclinic, which means crystallographicaly, it has only one symmetry fold. It must be rotated 360 degrees to be exactly the same. Due to it being triclinic it falls into the biaxial optical class, the axis degrees do not equal 90 degrees and the sides of each axis are not the same length. <ref>Alpers, C.N., Jmbor, J.L., Nordstrom, D.K.(2000) Reviews in Mineralogy and Geochemistry(volume 40) Sulfate Minerals: Crystallography, Geochemisrty, and Environmental Significance</ref> Amarantite is anisotropic,<ref name=mindat >http://www.mindat.org/min-182.html</ref> which means, the velocity of light varies with crystallographic direction, and, thus, there is more than one refractive index.<ref name=klein >Klein, Cornelis and Cornelius S. Hurlbut, Jr., Marialite-meionite series in Manual of Mineralogy, Wiley, 20th ed. 1985, pp. 287-297.</ref> ▼
▲Amarantite is triclinic, which means crystallographicaly, it has only one symmetry fold. It must be rotated 360 degrees to be exactly the same. Due to it being triclinic it falls into the biaxial optical class, the axis degrees do not equal 90 degrees and the sides of each axis are not the same length. <ref>Alpers, C.N., Jmbor, J.L., Nordstrom, D.K.(2000) Reviews in Mineralogy and Geochemistry(volume 40) Sulfate Minerals: Crystallography, Geochemisrty, and Environmental Significance</ref> Amarantite is anisotropic,<ref name=mindat >http://www.mindat.org/min-182.html</ref> which means, the velocity of light varies with crystallographic direction, and, thus, there is more than one refractive index.<ref name=klein >Klein, Cornelis and Cornelius S. Hurlbut, Jr., Marialite-meionite series in Manual of Mineralogy, Wiley, 20th ed. 1985, pp. 287-297.</ref>
 
It has moderate relief<ref name=mindat /> is the measure of the relative difference between the index of refraction of the mineral and that of the surrounding medium.<ref name=klein /> Amarantite is a very rare mineral and can only be found in a couple of places such as Carocoles, Chile. <ref>http://un2sg4.unige.ch/athena/cgi-bin/minfich?s=Amarantite</ref>
==References==
{{commonscat|Amarantite}}
{{Reflist}}
{{Refbegin}}
*Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 611-613.▼
{{Refend}}
 
▲*Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 611-613.
[[Category:Iron minerals]]▼
▲[[Category:Iron minerals]]
[[Category:Sulfate minerals]]
[[Category:Triclinic minerals]]
Retrieved from "https://en.wikipedia.org/wiki/Amarantite"