Mineral Information and Data:

Adamsite-(Y)
NaY(CO3)2 • 6H2O [CNMNC approved formula]

Named for Professor Frank Dawson Adams (1859-1942) of McGill University, Montreal, Quebec, Canada.

IMA status : Approved Species 1999 (IMA1999-020)
CLASSIFICATION 
Dana
(8th edition) :
15.04.08.01  
  (15) Hydrated Carbonates
  (15.04)
  (15.04.08)
  
Nickel-Strunz
(10th edition) :
05.CC.30
  (05) Carbonates and Nitrates
  (05.C) Carbonates without Additional Anions, with H2O
  (05.CC) With rare earth elements (REE)
  
Crystal system: Triclinic System
Point group (H-M): 1 — pinacoidal
Unit cell: a = 6.262 Å, b = 13.083 Å, c = 13.227 Å, α = 91.17°, β = 103.55°, γ = 90.19°
Crystal Habit: acicular to fibrous
Twinning: by reflection on {001}
  
Color: Colorless, white, pale pink, pale purple
Diaphaneity: Transparent to translucent
Luster: Vitreous to pearly
Hardness (Mohs): 3
Measured Density: 2.27 g/cm3
Cleavage: Perfect on {001}, good on {100} and {010}
Tenacity: Brittle
Streak: White
  
Geologic Setting: A rare late-stage, low-temperature hydrothermal mineral in an alkalic pegmatite dike associated with an intrusive alkalic gabbro-syenite complex.
Mineral Association: Thomasclarkite-(Y), horvathite-(Y), donnayite-(Y), petersenite-(Ce),
rhodochrosite.
  

 

Adamsite-(Y)
Origin: Mt. St. Hilaire, Quebec, Canada
Sample size: 3 x 2.5 cm
Photo: John Veevaert, Trinity Mineral Co

 

Adamsite-(Y)
(zoom-in of above)

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