Mineral Information and Data:

Adelite
CaMgAsO4(OH) [CNMNC approved formula]

Named from the Greek for indistinct, for its occurrence as massive.

IMA status : Valid species (Pre-IMA 1804) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
41.05.01.01  
  (41) Anhydrous Phosphates Containing Hydroxyl or Halogen
  (41.05) where (A B)2 (XO4) Zq
  (41.05.01) Adelite Group
  
Nickel-Strunz
(10th edition) :
08.BH.35
  (08) Phosphates, Arsenates, Vanadates
  (08.B) Phosphates, etc. with Additional Anions, without H2O
  (08.BH) With medium-sized and large cations, (OH,etc.):RO4 = 1:1
  
Crystal system: Orthorhombic System
Point group (H-M): 222 — disphenoidal
Unit cell: a = 7.43 Å, b = 8.85 Å, c = 5.88 Å
Crystal Habit: Crystals rare, elongated or tabular; commonly massive
  
Color: Colorless, gray to bluish gray, yellow to yellowish gray, pale green
Diaphaneity: Translucent to transparent
Luster: Resinous
Hardness (Mohs): 5
Measured Density: 3.73 g/cm3
Tenacity: Brittle
Fracture: Uneven to conchoidal
Streak: White
  
Geologic Setting: A rare mineral in a metamorphosed Fe–Mn orebody (Långban, Sweden); on willemite-franklinite ore from a metamorphosed stratiform zinc orebody (Franklin, New Jersey, USA).
Mineral Association: Sarkinite, arsenoclasite, braunite, hedyphane, fredrikssonite (Långban, Sweden); hausmannite, magnetite, copper (Kittel mine, Sweden); hodgkinsonite, barite, allactite, rhodochrosite, franklinite, willemite; chlorophoenicite (Franklin, New Jersey, USA); alleghanyite, kraisslite, sphalerite, rhodochrosite, willemite, franklinite; johnbaumite–svabite, zincite, barite, calcite (Sterling Hill, New Jersey, USA).
  

 

Adelite
Brown-yellow adelite with hausmannite
Origin: Långban, Värmland, Sweden
Sample size: micromount
Photo: Diederik Visser

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