kalsilite

{{short description|Vitreous white to grey feldspathoidal mineral}}

{{Infobox mineral

| name = Kalsilite

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| category = Tectosilicate minerals, feldspathoid group

| formula = KAlSiO₄

| IMAsymbol = Kls{{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 = Hexagonal

| class = 6 2 2 – Trapezohedral

| symmetry = P6₃22 (no. 182)

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| color = Colorless, white, gray

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| tenacity = Brittle

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| mohs = 6

| luster = Vitreous, greasy

| streak = White

| diaphaneity = Transparent, Translucent

| gravity = 2.59–2.62

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| references = {{cite web|url= http://www.mindat.org/min-2142.html|work=mindat.org|title= Kalsilite|accessdate=2021-12-17}}

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Kalsilite (KAlSiO₄) is a vitreous white to grey feldspathoidal mineral that is found in some potassium-rich lavas, such as from Chamengo Crater in Uganda. It has a relative hardness of 5.5.