Formula: CaMg(AsO4)(OH)
Anhydrous arsenate containing hydroxyl, adelite group
Specific gravity: 3.71 to 3.76
Hardness: 5
Streak: White
Colour: Colourless, white, grey, bluish grey, yellowish grey, yellow, pale green, pinkish brown, brown. Colourless in transmitted light
Solubility: Soluble in dilute acids

Metamorphic environments

Adelite is a rare mineral found in a metamorphosed iron-manganese ore body at Långban, Sweden, associated with sarkinite, arsenoclasite, braunite, hedyphane, fredrikssonite and dolomite (Dana, Mindat, HOM). At Jacobsberg and at the Kittel mine, Nordmark, Sweden, adelite occurs with hausmannite, magnetite and native copper Dana, HOM). At Franklin, New Jersey, USA, adelite occurs in willemite- franklinite ore from a metamorphosed zinc orebody, associated with hodgkinsonite, baryte, allactite, rhodochrosite, franklinite, willemite and chlorophoenicite (HOM). At Sterling Hill, New Jersey, USA, adelite is associated with alleghanyite, kraisslite, sphalerite, rhodochrosite, willemite, franklinite, johnbaumitesvabite, zincite, baryte and calcite (HOM).

Common impurities: Pb,Mn,Na,Cu,Ba

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