Aplowite

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| image = Aplowite & Cobaltite.jpg

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| caption = Aplowite on a cobaltite crystal

| category =Rozenite

| formula =(Co,Mn,Ni)SO4 · 4H2O

|IMAsymbol=Apw{{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}}

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| system =monoclinic

| class =Prismatic - 2/m

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| color =bright pink, light pink in light

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| mohs =3

| luster =Vitreous (Glassy)

| streak =white

| diaphaneity =transparent

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| density =2.33 g/cm3 (Measured)

2.36 g/cm3 (Calculated)

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| opticalprop =Biaxial (–). α = 1.528 β = n.d. γ = 1.536

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| 2V =n.d.

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| solubility =soluble in water

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| references = Jambor, J. L., and Boyle, R. W., 1984. Moorhouseite and aplowite, new cobalt minerals from Walton, Nova Scotia. Canadian Mineralogist 8, pp. 166-171

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Aplowite is a very rare mineral with the formula CoSO₄•4H₂O, a naturally occurring cobalt(II) sulfate tetrahydrate. It is the lower hydrate when compared to bieberite (heptahydrate) and moorhouseite (hexahydrate), and a higher hydrate when compared to cobaltkieserite (monohydrate). It occurs together with moorhouseite within efflorescences.{{cite web|url=http://www.mindat.org/min-282.html |title=Aplowite: Aplowite mineral information and data |website=Mindat.org |accessdate=2016-03-03}}