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Frank Dawson Adams
NaY(CO3)2 · 6H2O
Colourless, white, pale ...
Named in honor of Professor Frank Dawson Adams (1859–1942), McGill University, Montreal, Canada, geologist and petrologist, who studied the Monteregian Hills, one of which is Mont Saint-Hilaire.
Chemically similar to shomiokite-(Y), lecoqite-(Y), and horváthite-(Y); also to thomasclarkite-(Y) (bicarbonate).

The structure is layered; one carbonate group is perpendicular, and the other parallel to the layering. In the crystal structure there are NaYCO3 groups separated by layers of H2O. The neighbouring water layers have only H-bond linkage, which results in perfect cleavage (Grice et al., 2000).

Classification of Adamsite-(Y)

Approval Year:
First Published:

C : Carbonates without additional anions, with H2O
C : With rare earth elements (REE)

Physical Properties of Adamsite-(Y)

Diaphaneity (Transparency):
Transparent, Translucent
Colourless, white, pale pink, pale purple.
Hardness (Mohs):
Perfect on {001}; good on {100}, {010}.

Optical Data of Adamsite-(Y)

Biaxial (+)
RI values:
nα = 1.480 nβ = 1.498 nγ = 1.571
Max Birefringence:
δ = 0.091
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:

Chemical Properties of Adamsite-(Y)

IMA Formula:
NaY(CO3)2 · 6H2O
Elements listed in formula:
Analytical Data:
From type description. The empirical formula is based on 12 atoms of oxygen
Na2O (8.64)
CaO (0.05)
Y2O3 (22.88)
Ce2O3 (0.37)
Nd2O3 (1.41)
Sm2O3 (1.02)
Gd2O3 (1.92)
Tb2O3 (0.56)
Dy2O3 (3.28)
Ho2O3 (0.90)
Er2O3 (2.83)
Tm2O3 (0.27)
CO2 (25.10)
H2O (29.90)
total 100.17 wt.%
Common Impurities:

Crystallography of Adamsite-(Y)

Crystal System:
Class (H-M):
1 - Pedial
Space Group:
Space Group Setting:
Cell Parameters:
a = 6.2592 Å, b = 13.0838 Å, c = 13.227 Å
α = 91.130°, β = 103.554°, γ = 90.188°
a:b:c = 0.478 : 1 : 1.011
Unit Cell Volume:
V 1049.1 ų
Flat, acicular to fibrous crystals, up to 2.5 cm in length. Forming spherical groups of radiating crystals, more rarely reticulated groups. Elongated on [100] and flat on [001]. Forms observed are the pedions {010}, {010}, {001}, {001}, {100} and {100}.

Type Occurrence of Adamsite-(Y)

General Appearance of Type Material:
Crystals are acicular to fibrous, to 2.5 cm, elongated along [100], flattened on [001], showing {010} and {001}; in spherical radiating groups, which rarely are reticulated.
Place of Conservation of Type Material:
Canadian Museum of Nature, Ottawa, Canada, numbers 82939 and 82940.
Geological Setting of Type Material:
A rare late-stage, low-temperature hydrothermal mineral in an alkalic pegmatite dike associated with an intrusive alkalic gabbro-syenite complex.
Empirical Formula:
Na1.00(Y 0.72Dy0.06 Er0.05Gd0.04Nd0.03Yb0.02Sm0.02Ho0.02Ce 0.01Tb0.01Tm0.01)∑0.99C2.04H11.87O12

Relationship of Adamsite-(Y) to other Species

5.CC.05Donnayite-(Y)NaSr3CaY(CO3)6 · 3H2O
5.CC.05EwalditeBa(Na,Ca,Y,Ce,K)(CO3)2 · 2.6H2O
5.CC.05Mckelveyite-(Nd)(Ba,Sr)(Nd,Ce,La)(CO3)2 · 4-10H2O
5.CC.05Mckelveyite-(Y)NaBa3(Ca,U)Y(CO3)6 · 3H2O
5.CC.05WeloganiteNa2Sr3Zr(CO3)6 · 3H2O
5.CC.10Tengerite-(Y)Y2(CO3)3 · 2-3H2O
5.CC.15Kimuraite-(Y)CaY2(CO3)4 · 6H2O
5.CC.15Lokkaite-(Y)CaY4(CO3)7 · 9H2O
5.CC.20Shomiokite-(Y)Na3Y(CO3)3 · 3H2O
5.CC.25Calkinsite-(Ce)Ce2(CO3)3 · 4H2O
5.CC.25Lanthanite-(Ce)Ce2(CO3)3 · 8H2O
5.CC.25Lanthanite-(La)La2(CO3)3 · 8H2O
5.CC.25Lanthanite-(Nd)Nd2(CO3)3 · 8H2O
5.CC.35Decrespignyite-(Y)Y4Cu(CO3)4Cl(OH)5 · 2H2O
5.CC.40Galgenbergite-(Ce)CaCe2(CO3)4 · H2O

Other Names for Adamsite-(Y)

Name in Other Languages:

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Adamsite-(Y)

Reference List:
Grice, J. D., Gault, R. A., Roberts, A. C., Cooper, M. A. (2000) Adamsite-(Y), a new sodium-yttrium carbonate mineral species from Mont Saint-Hilaire, Quebec. Canadian Mineralogist 38, 1457-1466.

Internet Links for Adamsite-(Y) URL:
Please feel free to link to this page.

Localities for Adamsite-(Y)

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Canada (TL)
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
        • Mont Saint-Hilaire
Grice, J. D., Gault, R. A., Roberts, A. C., Cooper, M. A. (2000) Adamsite-(Y), a new sodium-yttrium carbonate mineral species from Mont Saint-Hilaire, Quebec. Canadian Mineralogist, 38, 1457-1466.
  • Nordland
    • Tysfjord
Husdal, T. (2008): The minerals of the pegmatites within the Tysfjord granite, northern Norway. Norsk Bergverksmuseum, skrift 38, 5-28.
  • Northern Region
    • Murmanskaja Oblast'
      • Kola Peninsula
        • Lovozero Massif
          • Alluaiv Mt
            • Umbozero mine (Umbozerskii mine; Umba Mine)
P.M. Kartashov data
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