Adelite

Adelite
Pinkish crystal aggregates of adelite from the Franklin deposit in Ogdensburg, New Jersey
General
Category
Formula (repeating unit)	CaMg(AsO4)(OH)
Strunz classification	8.BH.35
Dana classification	41.5.1.1
Crystal system	Orthorhombic
Crystal class	2 2 2 - Disphenoidal
Space group	P212121
Identification
Color	Colourless, white, grey, bluish grey, yellowish grey, yellow, pale green, pinkish brown, brown
Crystal habit	Elongate crystals, massive
Cleavage	None Observed
Mohs scale hardness	5
Luster	Vitreous, Greasy
Diaphaneity	Transparent, Translucent
Specific gravity	3.73 to 3.79
Optical properties	Biaxial (+), colorless (transmitted light)
References	[1]

The rare mineral adelite, (IMA symbol Ade^[2]) 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.

Geologic occurrence[]

Adelite has been found in ore deposits in Algeria, Germany, Italy, Sweden and the USA.^[1]

See also[]

• Descloizite

References[]

Look up adelite in Wiktionary, the free dictionary.

• Mindat.org
• Webmineral data

Bibliography[]

• Palache, P.; Berman H.; Frondel, C. (1960). "Dana's System of Mineralogy, Volume II: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. (Seventh Edition)" John Wiley and Sons, Inc., New York, pp. 804-806.

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