{{Infobox mineral | name = Zykaite | boxwidth = | boxbgcolor = | image = Zýkaite.jpg | imagesize = | alt = | caption = Zykaite found in the Czech Republic | struct image = | struct caption = | struct imagesize = | struct2 image = | struct2 caption = | struct2 imagesize= | SMILES = | Jmol = | category = | formula = Fe<sup>3+</sup><sub>4</sub>(AsO<sub>4</sub>)<sub>3</sub>(SO<sub>4</sub>)(OH)·15(H<sub>2</sub>O) | IMAsymbol = | molweight = | strunz = | dana = | system = | class = | symmetry = | unit cell = | color = Grey-white, Yellow-white, Green-white | colour = | habit = | twinning = | cleavage = | fracture = Irregular, Uneven | tenacity = Waxy | toughness = | mohs = 2 | luster = Dull | streak = Pale yellow | diaphaneity = Translucent | gravity = 2.5 | density = 2.50 g/cm<sup>3</sup> | polish = | opticalprop = | refractive = | birefringence = | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | Curie temp = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | prop1 = | prop1text = | references = | var1 = | var1text = | var2 = | var2text = | var3 = | var3text = | var4 = | var4text = | var5 = | var5text = | var6 = | var6text = }} '''Zykaite''' or '''zýkaite''' is a grey-white mineral consisting of arsenic, hydrogen, iron, sulfur and oxygen with formula: Fe<sup>3+</sup><sub>4</sub>(AsO<sub>4</sub>)<sub>3</sub>(SO<sub>4</sub>)(OH)·15(H<sub>2</sub>O).<ref name=Webmin>[http://webmineral.com/data/Zykaite.shtml Webmineral data]</ref> This dull mineral is very soft with a Mohs hardness of only 2 and a specific gravity of 2.5. It is translucent and crystallizes in the orthorhombic crystal system.<ref name=HB>[http://rruff.geo.arizona.edu/doclib/hom/zykaite.pdf Handbook of Mineralogy]</ref>
It is in the Sanjuanite-Destinezite mineral group, containing group members Destinezite, Sanjuanite, and Sarmientite.
Its common associates include limonite, gypsum, scorodite, quartz and arsenopyrite.<ref name=HB/> It is found in the Czech Republic, New Zealand, Poland and Germany.<ref name=Mindat/>
Zykaite was first described in 1978 for an occurrence in the Safary mine, Kutná Hora, Bohemia, Czech Republic and named in honour of Vaclav Zyka (born 1926), a Czech geochemist.<ref name=HB/><ref name=Mindat>[http://www.mindat.org/min-4437.html Mindat.org]</ref>
==References== {{Reflist}}
Category:Sulfate minerals Category:Arsenic minerals Category:Orthorhombic minerals
{{Sulfate-mineral-stub}}