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Moydite-(Y)

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Formula:
Y[B(OH)
 
4
](CO
 
3
)
System:OrthorhombicColour:Yellow, also colorless
Hardness:1 - 2
Name:
Named in 1986 by Joel D. Grice, Jerry Van Velthuizen, Pete J. Dunn, D. E. Newbury, E. S. Etz, and C. H. Nielsen, in honor of Luis Moyd [March 13, 1916 Philadelphia, PA, USA - February 4, 2006 Ottawa, Ontario, Canada], curator of mineralogy, National Museums of Canada.


Related to Cahnite.

Classification of Moydite-(Y)

IMA status:Approved 1985
Strunz 8th edition ID:5/G.12-10
Nickel-Strunz 10th (pending) edition ID:6.AC.45

6 : BORATES
A : Monoborates
C : B(O,OH)4, without and with additional anions; 1(T), 1(T)+OH, etc
Dana 8th edition ID:27.1.9.1

27 : COMPOUND BORATES
1 : Miscellaneous
Hey's CIM Ref.:10.4.5

10 : Borates with other anions
4 : Borates with carbonate
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Type Occurrence of Moydite-(Y)

Type Locality:Evans-Lou Mine, Lac Saint-Pierre (Wakefield Lake), Val-des-Monts, Les Collines-de-l'Outaouais RCM, Outaouais, Québec, Canada
General Appearance of Type Material:Yellow bladed gemmy crystals to 1 mm+
Year of Discovery:1986
Geological Setting of type material:Granite pegmatite rich in rare earth minerals
Associated Minerals at type locality:
Xenotime-(Y)TitaniteSpessartineQuartzMetatyuyamunite
MetatorberniteLokkaite-(Y)Kainosite-(Y)Fergusonite-(Y)Caysichite-(Y)

Physical Properties of Moydite-(Y)

Lustre:Vitreous, Sub-Vitreous
Diaphaneity (Transparency):Transparent
Colour:Yellow, also colorless
Streak:pale yellow to colorless
Hardness (Mohs):1 - 2
Comment:"Soft", Probably harder than 2
Tenacity:Brittle
Cleavage:Distinct/Good
{010} good; {101} poor
Fracture:Conchoidal
Density (measured):3.133 g/cm3
Density (calculated):3.018 g/cm3

Crystallography of Moydite-(Y)

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:Pbca {P21/b 21/c 21/a}
Space Group Setting:Pbca
Cell Parameters:a = 9.089Å, b = 12.244Å, c = 8.926Å
Ratio:a:b:c = 0.742 : 1 : 0.729
Unit Cell Volume:V 993.34 ų (Calculated from Unit Cell)
Z:8
X-Ray Powder Diffraction:
d-spacingIntensity
6.106 (100)
4.501 (90)
3.179 (70)
2.818 (50)
2.749 (30)
2.525 (40)
2.203 (30)

Optical Data of Moydite-(Y)

Type:Biaxial (-)
RI values: nα = 1.588 nβ = 1.681 nγ = 1.690
2V:Measured: 32° , Calculated: 34°
Birefringence:0.102
Maximum Birefringence:δ = 0.102

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High
Dispersion:relatively strong
Optical Extinction:Parallel, XYZ - bac
Pleochroism:Non-pleochroic

Chemical Properties of Moydite-(Y)

Formula:
Y[B(OH)
 
4
](CO
 
3
)
Essential elements:B, C, H, O, Y
All elements listed in formula:B, C, H, O, Y
Common Impurities:REE

Relationship of Moydite-(Y) to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
6.AC.05Sinhalite
MgAl(BO
 
4
)
6.AC.10Pseudosinhalite
Mg
 
2
Al
 
3
(BO
 
3
)
 
2
(OH)O
 
3
6.AC.15Behierite
(Ta
5+
 
,Nb
5+
 
)(BO
 
4
)
6.AC.15Schiavinatoite
(Nb,Ta)(BO
 
4
)
6.AC.20Frolovite
Ca[B(OH)
 
4
]
 
2
6.AC.25Hexahydroborite
Ca[B(OH)
 
4
]
 
2
 · 6H
 
2
O
6.AC.30Henmilite
Ca
 
2
Cu[B(OH)
 
4
]
 
2
(OH)
 
4
6.AC.35Bandylite
Cu[B(OH)
 
4
]Cl
6.AC.40Teepleite
Na
 
2
[B(OH)
 
4
]Cl
6.AC.50Carboborite
Ca
 
2
Mg[B(OH)
 
4
]
 
2
(CO
 
3
)
 
2
 · 4H
 
2
O
6.AC.55Sulfoborite
Mg
 
3
[B(OH)
 
4
]
 
2
(SO
 
4
)(OH,F)
 
2
6.AC.60Lüneburgite
Mg
 
3
[B
 
2
(OH)
 
6
](PO
 
4
)
 
2
 · 6H
 
2
O
6.AC.65Seamanite
Mn
2+
3
[B(OH)
 
4
](PO
 
4
)(OH)
 
2
6.AC.70Cahnite
Ca
 
2
[B(OH)
 
4
](AsO
 
4
)
Related Minerals - Hey's Index Grouping:

- +
10.4.1Canavesite
Mg
 
2
(HBO
 
3
)(CO
 
3
) · 5H
 
2
O
10.4.2Carboborite
Ca
 
2
Mg[B(OH)
 
4
]
 
2
(CO
 
3
)
 
2
 · 4H
 
2
O
10.4.3Borcarite
Ca
 
4
Mg(B
 
4
O
 
6
(OH)
 
6
)(CO
 
3
)
 
2
10.4.4Sakhaite
Ca
 
12
Mg
 
4
(BO
 
3
)
 
7
(CO
 
3
)
 
4
(OH)
 
2
Cl
10.4.6Gaudefroyite
Ca
 
4
Mn
3+
2-3
(BO
 
3
)
 
3
(CO
 
3
)(O,OH)
 
3

Other Names for Moydite-(Y)

Synonyms:
IMA1985-025
Other Languages:
Russian:Муадит-(Y)

Other Information

Fluorescence in UV light:Not fluorescent
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Moydite-(Y)

Reference List:

- +
American Mineralogist (1988): 73: 193-194.

Canadian Mineralogist (1986): 24: 665-673, 675-678.

Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

Internet Links for Moydite-(Y)

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    • Localities for Moydite-(Y)

    The 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.
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    (TL) indicates type locality. ? 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
     
    • Québec
      • Outaouais
        • Les Collines-de-l'Outaouais RCM
          • Val-des-Monts
            • Lac Saint-Pierre (Wakefield Lake)
    		Grice, et al (1986) Canadian Mineralogist: 24: 675.
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