{{Short description|Sulfate mineral}} {{Infobox mineral | name = Botryogen | boxwidth = | boxbgcolor = | image = Botryogen-Butlerite-Copiapite-d05-1a.jpg | alt = | caption = Specimen from Mina Santa Elena, Alcaparrosa, San Juan, Argentina with a red colored crystal of botryogen in a matrix of butlerite, copiapite and parabutlerite (size:5.7 x 4.1 x 2.5 cm) | category = Sulfate minerals | formula = MgFe<sup>3+</sup>(SO<sub>4</sub>)<sub>2</sub>(OH)·7H<sub>2</sub>O | IMAsymbol=Byg<ref>{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|journal=Mineralogical Magazine|volume=85|issue=3|pages=291–320|doi=10.1180/mgm.2021.43|bibcode=2021MinM...85..291W|s2cid=235729616|doi-access=free}}</ref> | molweight = | strunz = 7.DC.25 | dana = | system = Monoclinic | class = Prismatic (2/m) <br/><small>(same H-M symbol)</small> | symmetry = ''P2''<sub>1</sub>/n | unit cell = | color = | colour = | habit = | twinning = | cleavage = | fracture = | tenacity = | mohs = 2 - 2.5 | luster = | streak = | diaphaneity = | gravity = 2.14 | density = | polish = | opticalprop = | refractive = | birefringence = | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | prop1 = | prop1text = | references = <ref>[https://www.mineralienatlas.de/lexikon/index.php/MineralData?mineral=Botryogen Mineralienatlas]</ref> }}
'''Botryogen''' is a hydrous magnesium sulfate mineral with formula: MgFe<sup>3+</sup>(SO<sub>4</sub>)<sub>2</sub>(OH)·7H<sub>2</sub>O. It is also known as ''quetenite''.<ref>{{Cite web|url=http://webmineral.com/data/Botryogen.shtml|title=Botryogen Mineral Data|website=webmineral.com|access-date=2019-11-03}}</ref>
It crystallizes in the monoclinic prismatic system and typically occurs as vitreous bright yellow to red botryoidal to reniform masses and radiating crystal prisms. It has a specific gravity in the range 2 to 2.1 and Mohs hardness in the range of 2 to 2.5.<ref name=":0">{{Cite web|url=https://www.mindat.org/min-733.html|title=Botryogen: Mineral information, data and localities.|website=www.mindat.org|access-date=2019-11-03}}</ref>
It occurs in arid climates as a secondary alteration product of pyrite-bearing deposits.<ref>[http://rruff.geo.arizona.edu/doclib/hom/botryogen.pdf Mineral Data Publishing - botryogen.pdf]</ref>
It was first described in 1828 for an occurrence in the Falu mine of Falun, Dalarna, Sweden. It was named for its grape like appearance from Greek ''botrys'' for "bunch of grapes" and ''genos'' meaning "to bear".<ref name=":0" />
==References== {{Reflist}}
== Further reading == * Palache, C., H. Berman, and C. Frondel (1951) ''Dana’s system of mineralogy'', (7th edition), v. II, pp. 617–618.
Category:Sulfate minerals Category:Monoclinic minerals Category:Minerals in space group 14
{{sulfate-mineral-stub}}