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Adelite

• 
  Squaw Creek Mine, Taylor Creek Tin District (Black Range Tin District), Sierra Co., New Mexico, USA

• Formula:
  CaMg(AsO₄)(OH)

• System: Orthorhombic

• Name:
  Named by Hjalmar Sjögren in 1891 from the Greek άδηλος for "adelos," "obscure" or "indistinct", in reference to its lack of transparency.

• IMA Status: Valid (Grandfathered)
  Approved 1891

• Type Localities:
  Långban, Filipstad, Värmland, Sweden

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  Kittel Mine, Nordmark (Nordmarksberg), Filipstad, Värmland, Sweden

• Dana 8th: 41.5.1.1
  
  41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
  5 : (AB)₂(XO₄)Z_q

• Strunz 9th:
  8.BH.35
  
  8 : PHOSPHATES, ARSENATES, VANADATES
  B : Phosphates, etc., with additional anions, without H2O
  H : With medium-sized and large cations, (OH,etc.):RO4 = 1:1

• Hardness (Mohs): 5

• Density: 3.71 g/cm³ to 3.76 g/cm³ (measured)
  3.78 g/cm³ (calculated)

• Lustre: Resinous

• Diapheny: Transparent,Translucent

• Diapheny: brittle

• Colour: Colourless, white, grey, bluish grey, yellowish grey, yellow, pale green, pinkish brown, brown

• Streak: White