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Formula: CaMg(AsO4)(OH)
Anhydrous arsenate containing hydroxyl,
adelite-descloizite group
Crystal System: Orthorhombic
Specific gravity: 3.71 to 3.76 measured, 3.78 calculated
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
Common impurities: Pb,Mn,Na,Cu,Ba
Environments:
Localities
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).
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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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