Moydite-(Y)
A valid IMA mineral species
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About Moydite-(Y)
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 moydite 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. The suffix/modifier was added a year later, following the Levinson rule for species with essential REE indicating, in this case, predominant yttrium.
Unique Identifiers
Mindat ID:
2798
Long-form identifier:
mindat:1:1:2798:0
GUID
(UUID V4):
(UUID V4):
a77d9acf-69e2-4db5-b8a8-1da75f22dfdd
IMA Classification of Moydite-(Y)
Classification of Moydite-(Y)
6.AC.45
6 : BORATES
A : Monoborates
C : B(O,OH)4, without and with additional anions; 1(T), 1(T)+OH, etc
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
27 : COMPOUND BORATES
1 : Miscellaneous
10.4.5
10 : Borates with other anions
4 : Borates with carbonate
10 : Borates with other anions
4 : Borates with carbonate
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Moy-Y | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Moydite-(Y)
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
{010} good; {101} poor
Fracture:
Conchoidal
Density:
3.133 g/cm3 (Measured) 3.018 g/cm3 (Calculated)
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
Max Birefringence:
δ = 0.102
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
relatively strong
Optical Extinction:
Parallel. X = b; Y = a; Z = c.
Pleochroism:
Non-pleochroic
Chemistry of Moydite-(Y)
Mindat Formula:
Y[B(OH)4](CO3)
Common Impurities:
REE
Crystallography of Moydite-(Y)
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
Morphology:
Type material: Platy basal pinacoid {010} modified by the rhombic dipyramid {111} and, occasionally, a minor development of pinacoids {100} and {001}.
Crystal Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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CIF File Best | x | y | z | a | b | c
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Rotation
Stop | Start
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Labels
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0005214 | Moydite-(Y) | Grice J D, Ercit T S (1986) The crystal structure of moydite The Canadian Mineralogist 24 675-678 |  | 1986 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.106 Å | (100) |
| 4.501 Å | (90) |
| 3.179 Å | (70) |
| 2.818 Å | (50) |
| 2.749 Å | (30) |
| 2.525 Å | (40) |
| 2.203 Å | (30) |
Comments:
Evans-Lou Mine, Québec, Canada. Data from the type description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 22 : Hydration and low-𝑇 subsurface aqueous alteration (see also #23) |
Type Occurrence of Moydite-(Y)
General Appearance of Type Material:
Yellow bladed gemmy crystals to 1 mm+.
Place of Conservation of Type Material:
Canadian Museum of Nature, Ottawa, Canada, numbers 50771 and 50772 (holotype and cotype).
National Museum of Natural History, Washington, D.C., USA, number 162936 (cotype).
National Museum of Natural History, Washington, D.C., USA, number 162936 (cotype).
Geological Setting of Type Material:
Granite pegmatite rich in rare earth minerals.
Associated Minerals at Type Locality:
Synonyms of Moydite-(Y)
Other Language Names for Moydite-(Y)
Russian:Муадит-(Y)
Related Minerals - Strunz-mindat Grouping
| 6.AC.05 | Sinhalite | MgAl(BO4) |
| 6.AC.10 | Pseudosinhalite | Mg2Al3(BO3)2(OH)O3 |
| 6.AC.15 | Béhierite | (Ta5+,Nb5+)(BO4) |
| 6.AC.15 | Schiavinatoite | (Nb,Ta)(BO4) |
| 6.AC.20 | Frolovite | Ca[B(OH)4]2 |
| 6.AC.25 | Hexahydroborite | Ca[B(OH)4]2 · 2H2O or CaB2O4 · 6H2O |
| 6.AC.30 | Henmilite | Ca2Cu[B(OH)4]2(OH)4 |
| 6.AC.35 | Bandylite | Cu[B(OH)4]Cl |
| 6.AC.40 | Teepleite | Na2[B(OH)4]Cl |
| 6.AC.50 | Carboborite | Ca2Mg[B(OH)4]2(CO3)2 · 4H2O |
| 6.AC.55 | Sulfoborite | Mg3[B(OH)4]2(SO4)(OH,F)2 |
| 6.AC.60 | Lüneburgite | Mg3[B2(OH)6](PO4)2 · 6H2O |
| 6.AC.65 | Seamanite | Mn2+3[B(OH)4](PO4)(OH)2 |
| 6.AC.70 | Cahnite | Ca2[B(OH)4](AsO4) |
Fluorescence of Moydite-(Y)
Not fluorescent.
Other Information
Notes:
Not readily soluble in 30% HCl.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Moydite-(Y)
mindat.org URL:
https://www.mindat.org/min-2798.html
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References for Moydite-(Y)
Localities for Moydite-(Y)
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Canada (TL) | |
| Grice et al. (1986) |
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Evans-Lou Mine, Lake Saint-Pierre, Saint-Pierre-de-Wakefield, Val-des-Monts, Les Collines-de-l'Outaouais RCM, Outaouais, Québec, Canada