Anhydrous arsenate containing hydroxyl, adelite group
Specific gravity: 3.71 to 3.76
Colour: Colourless, white, grey, bluish grey, yellowish grey, yellow, pale green, pinkish brown, brown; colourless in transmitted light
Solubility: Soluble in dilute acids
Common impurities: Pb,Mn,Na,Cu,Ba
There are two co-type localities, Bergsråds sänkning, Långban mine, Långban Ore District, and Kitteln Mine, Nordmark Odal Field, both in Filipstad, Värmland County, Sweden.
At Bergsråds sänkning, Långban mine, Långban Ore District, Filipstad, Värmland County, Sweden, one of the type localities, adelite is a rare mineral found in a metamorphosed iron-manganese ore body, associated with sarkinite, arsenoclasite, braunite, hedyphane, fredrikssonite and dolomite (Dana, Mindat, HOM).
At the Kitteln Mine, Nordmark Odal Field, Filipstad, Värmland County, Sweden, one of the type localities, adelite occurs with hausmannite, magnetite and native copper Dana, HOM).
At the Franklin Mine, Franklin, Franklin Mining District, Sussex County, 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 the Sterling Mine, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex County, New Jersey, USA, adelite is associated with alleghanyite, kraisslite, sphalerite, rhodochrosite, willemite, franklinite, johnbaumite–svabite, zincite, baryte and calcite (HOM).
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