{{Short description|Nickel arsenate mineral}} {{Infobox mineral | name = Aerugite | category = Arsenate minerals | image = File:Aerugite-154934.jpg | formula = Ni<sub>9</sub>(AsO<sub>4</sub>)<sub>2</sub>AsO<sub>6</sub> |IMAsymbol=Aru<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 = 8.BC.15 | color = Grass green, blue-green | habit = Massive to crystalline crusts | system = Trigonal | class = Hexagonal scalenohedral ({{overline|3}}m) <br/>H-M symbol: ({{overline|3}} 2/m) | symmetry = ''R''{{overline|3}}m | twinning = | cleavage = | fracture = | tenacity = | mohs = 4 | luster = Adamantine | streak = light green, greenish white | diaphaneity = Opaque to semitransparent | gravity = 5.85–5.95 | density = | polish = | opticalprop = | refractive = | birefringence = | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence= | absorption = | melt = | fusibility = | diagnostic = | solubility = | other = | alteration = | references = <ref name="Mindat">[http://www.mindat.org/min-36.html Mindat.org Aerugite page]</ref><ref name="Webmineral">[https://www.webmineral.com/data/Aerugite.shtml Webmineral Aerugite page]</ref><ref>https://rruff.geo.arizona.edu/doclib/hom/aerugite.pdf Handbook of Mineralogy</ref> }}
'''Aerugite''' is a rare complex nickel arsenate mineral with a variably reported formula: Ni<sub>9</sub>(AsO<sub>4</sub>)<sub>2</sub>AsO<sub>6</sub>. It forms green to deep blue-green trigonal crystals. It has a Mohs hardness of 4 and a specific gravity of 5.85 to 5.95.
It was first described in 1858 in either the South Terres mine of Cornwall, England or in the Ore Mountains, Saxony, Germany. The origin is disputed. The most common occurrence is as an incrustation on furnace walls in which ores are ''roasted''. Its name comes from the Latin word ''aerugo'' for ''copper rust''.
==See also== * List of minerals
==References== {{reflist}}
Category:Nickel minerals Category:Arsenate minerals Category:Trigonal minerals Category:Minerals in space group 166
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