# Adelite
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> Source: https://en.wikipedia.org/wiki/Adelite
> Source revision: 1267261067
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{{Short description|Arsenate mineral}}
{{infobox mineral
| name = Adelite
| category = [Adelite-descloizite group](/source/Adelite-descloizite_group)
| boxbgcolor =
| image = Adelite.jpg
| imagesize =
| caption = Pinkish crystal aggregates of adelite from the Franklin deposit in [Ogdensburg, New Jersey](/source/Ogdensburg%2C_New_Jersey)
| formula = CaMg(AsO4)(OH)
|IMAsymbol=Ade[{{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}}]
| strunz = 8.BH.35
| dana = 41.5.1.1
| system = [Orthorhombic](/source/Orthorhombic)
| class = 2 2 2 – Disphenoidal
| symmetry = P212121
| unit cell =
| color = Colourless, white, grey, bluish grey, yellowish grey, yellow, pale green, pinkish brown, brown
| habit = Elongate crystals, massive
| twinning =
| cleavage = None observed
| luster = Vitreous, greasy
| diaphaneity =Transparent, translucent
| mohs = 5
| gravity = 3.73 to 3.79
| opticalprop = Biaxial (+), colorless (transmitted light)
| refractive =
| references = [[http://www.mindat.org/min-23.html Mindat.org]]}}
The rare [mineral](/source/mineral) '''adelite,''' is a [calcium](/source/calcium), [magnesium](/source/magnesium), [arsenate](/source/arsenate) with [chemical formula](/source/chemical_formula) CaMgAsO4OH. It forms a [solid solution](/source/solid_solution) series with the [vanadium](/source/vanadium)-bearing mineral [gottlobite](/source/gottlobite). Various [transition metal](/source/transition_metal)s substitute for magnesium and lead replaces calcium leading to a variety of similar minerals in the ''adelite–[duftite](/source/duftite) group''.
Adelite forms variably colored (blue, green, yellow and grey) crystals in the [orthorhombic](/source/orthorhombic) crystal system. The form is typically [massive](/source/Crystal_habit). It has a [Mohs hardness](/source/Mohs_hardness) rating of 5 and a [specific gravity](/source/specific_gravity) of 3.73 to 3.79.
It was first described in 1891 from [Värmland](/source/V%C3%A4rmland), [Sweden](/source/Sweden). Its name comes from the [Greek](/source/Greek_language) word for ''indistinct''.
==Geologic occurrence==
Adelite has been found in [ore](/source/ore) deposits in [Algeria](/source/Algeria), [Germany](/source/Germany), [Italy](/source/Italy), Sweden and the [US](/source/United_States).