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Moydite-(Y)

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Louis Moyd
Formula:
Y[B(OH)4](CO3)
Colour:
Yellow, also colorless
Lustre:
Vitreous, Sub-Vitreous
Hardness:
1 - 2
Specific Gravity:
3.133
Crystal System:
Orthorhombic
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.


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Classification of Moydite-(Y)Hide

Approved
Approval Year:
1985
6.AC.45

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

27 : COMPOUND BORATES
1 : Miscellaneous
10.4.5

10 : Borates with other anions
4 : Borates with carbonate

Physical Properties of Moydite-(Y)Hide

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

Optical Data of Moydite-(Y)Hide

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

Formula:
Y[B(OH)4](CO3)
IMA Formula:
YB(OH)4(CO3)
Common Impurities:
REE

Crystallography of Moydite-(Y)Hide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pbca
Setting:
Pbca
Cell Parameters:
a = 9.089 Å, b = 12.244 Å, c = 8.926 Å
Ratio:
a:b:c = 0.742 : 1 : 0.729
Unit Cell V:
993.34 ų (Calculated from Unit Cell)
Z:
8

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
6.106 (100)
4.501 (90)
3.179 (70)
2.818 (50)
2.749 (30)
2.525 (40)
2.203 (30)

Type Occurrence of Moydite-(Y)Hide

General Appearance of Type Material:
Yellow bladed gemmy crystals to 1 mm+
Geological Setting of Type Material:
Granite pegmatite rich in rare earth minerals
Associated Minerals at Type Locality:

Synonyms of Moydite-(Y)Hide

Other Language Names for Moydite-(Y)Hide

Related Minerals - Nickel-Strunz GroupingHide

6.AC.05SinhaliteMgAl(BO4)Orth. mmm (2/m 2/m 2/m) : Pnma
6.AC.10PseudosinhaliteMg2Al3(BO3)2(OH)O3Mon.
6.AC.15Béhierite(Ta5+,Nb5+)(BO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
6.AC.15Schiavinatoite(Nb,Ta)(BO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
6.AC.20FroloviteCa[B(OH)4]2Tric.
6.AC.25HexahydroboriteCa[B(OH)4]2 · 2H2O or CaB2O4 · 6H2OMon. 2/m : B2/b
6.AC.30HenmiliteCa2Cu[B(OH)4]2(OH)4Tric.
6.AC.35BandyliteCu[B(OH)4]ClTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
6.AC.40TeepleiteNa2[B(OH)4]ClTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
6.AC.50CarboboriteCa2Mg[B(OH)4]2(CO3)2 · 4H2OMon.
6.AC.55SulfoboriteMg3[B(OH)4]2(SO4)(OH,F)2Orth. mm2
6.AC.60LüneburgiteMg3[B2(OH)6](PO4)2 · 6H2OTric.
6.AC.65SeamaniteMn2+3[B(OH)4](PO4)(OH)2Orth. mmm (2/m 2/m 2/m)
6.AC.70CahniteCa2[B(OH)4](AsO4)Tet. 4 : P4

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

10.4.1CanavesiteMg2(HBO3)(CO3) · 5H2OMon.
10.4.2CarboboriteCa2Mg[B(OH)4]2(CO3)2 · 4H2OMon.
10.4.3BorcariteCa4Mg(B4O6(OH)6)(CO3)2Tric.
10.4.4SakhaiteCa12Mg4(BO3)7(CO3)4(OH)2ClIso. m3m (4/m 3 2/m) : Fd3m
10.4.6GaudefroyiteCa4Mn3+2-3(BO3)3(CO3)(O,OH)3Hex.

Fluorescence of Moydite-(Y)Hide

Not fluorescent

Other InformationHide

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 Moydite-(Y)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Grice, J.D., Van Velthuizen, J.J., Dunn, P.J., Newbury, D.E., Etz, E.S. & Nielsen, C,H. (1986) Moydite (Y,REE)[B(OH)4](CO3), a new mineral species from the Evans-Lou pegmatite, Quebec. Canadian Mineralogist, 24, 665-673.
Grice, J.D. & Ercit, T.S. (1986) The crystal structure of moydite. Canadian Mineralogist, 24, 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)Hide

Localities for Moydite-(Y)Hide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Canada (TL)
 
  • Québec
    • Outaouais
      • Les Collines-de-l'Outaouais RCM
        • Val-des-Monts
          • Lac Saint-Pierre (Wakefield Lake)
Grice, J.D., Van Velthuizen, J.J., Dunn, P.J., Newbury, D.E., Etz, E.S. & Nielsen, C,H. (1986) Moydeite (Y,REE)[B(OH)4](CO3), a new mineral species from the Evans-Lou pegmatite, Quebec. Canadian Mineralogist, 24, 665-673.
Mineral and/or Locality  
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