Mineral Information and Data:

Ardealite
Ca2(PO3OH)(SO4) • 4H2O [CNMNC approved formula]

Named from "Ardeal," the old Romanian name for Transylvania, wherein lies the type locality.

IMA status : Valid species (Pre-IMA 1932) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
43.01.01.01  
  (43) Compound Phosphates
  (43.01) (Acid with Compound Anions.)
  (43.01.01)
  
Nickel-Strunz
(10th edition) :
08.CJ.50
  (08) Phosphates, Arsenates, Vanadates
  (08.C) Phosphates without Additional Anions, with H2O
  (08.CJ) With only large cations
  
Crystal system: Monoclinic System
Point group (H-M): m — domatic
Unit cell: a = 5.721 Å, b = 30.992 Å, c = 6.250 Å, b = 117.26°
Crystal Habit: Very fine-grained powdery masses and crusts
  
Color: Pale yellow, yellow, brownish yellow, colorless
Diaphaneity: Semitransparent
Hardness (Mohs): 1 - 1.5
Measured Density: 2.34 g/cm3
Streak: White
  
Geologic Setting: In limestone caves, as an early stage of the breakdown of bat guano, in reaction with calcite.
Mineral Association: Brushite, gypsum, carbonate-hydroxylapatite, newberyite, taranakite
  
Other Properties: BioMineral.

 

Ardealite
Origin: Moorba Cave, Jurien Bay, Western Australia, Australia
Sample size: Tan coloured powder in micromount box.
Photo: Tom Loomis

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