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Adelite The rare mineral adelite, is a calcium, magnesium, arsenate with chemical formula CaMgAsO4OH. It forms a solid solution series with the vanadium bearing mineral gottlobite. Various transition metals substitute for magnesium and lead replaces calcium leading to a variety of similar minerals in the ''adelite - duftite group''. Adelite forms variably colored (blue, green, yellow and grey) crystals in the orthorhombic crystal system. The form is typically massive. It has a Mohs hardness rating of 5 and a specific gravity of 3.73 to 3.79. It was first described in 1891 from Värmland, Sweden. Its name comes from the Greek word for ''indistinct''. ==References==
*(Mindat.org ) *(Webmineral data )
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