Apjohnite

{{Infobox mineral

| name = Apjohnite

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| image = Ilesite & Apjohnite.jpg

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| caption = Apjohnite (white) found with ilesite

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| formula = Mn{{sup|2+}}Al{{sub|2}}(SO{{sub|4}}){{sub|4}}·22H{{sub|2}}O

| IMAsymbol = API

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| color = Colourless, white, light pink, light yellow, light green

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| mohs = 1.5-2

| luster = Silky

| streak = White

| diaphaneity = Transparent, Translucent

| gravity = 1.78 - 1.81

| density = 1.78 - 1.81 g/cm3 (Measured)
1.836 g/cm3 (Calculated)

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Apjohnite (IMA symbol: Apj{{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}}) is a manganese aluminium sulfate mineral with the chemical formula Mn{{sup|2+}}Al{{sub|2}}(SO{{sub|4}}){{sub|4}}·22H{{sub|2}}O. It was named after Trinity College Dublin professor James Apjohn. Its type locality is Maputo Province, Mozambique.[https://mindat.org/min-281.html Apjohnite] {{Webarchive|url=https://web.archive.org/web/20190326150903/https://www.mindat.org/min-281.html |date=2019-03-26 }} on mindat.org