Moydite-(Y) Mineral Data

General Moydite-(Y) Information

Chemical Formula:

YB(OH)4(CO3)

Composition:

Molecular Weight = 227.75 gm

Yttrium 39.04 % Y 49.57 % Y₂O₃

Boron 4.75 % B 15.28 % B₂O₃

Hydrogen 1.77 % H 15.82 % H₂O

Carbon 5.27 % C 19.32 % CO₂

Oxygen 49.17 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

YB(OH)₄(CO₃)

Environment:

Secondary mineral in quartz in a zoned granite pegmatite.

IMA Status:

Approved IMA 1986

Locality:

Evans-Lou quarry, near Wakefield Lake, Quebec, Canada. Link to MinDat.org Location Data.

Name Origin:

Named for Louis Moyd (1916- ), Canadian mineralogist, Emeritus Curator, National Museum of Natural Sciences, Ottawa, Canada.

Name Pronunciation:

Moydite-(Y)

Synonym:

ICSD 63262

IMA1985-025

PDF 40-508

Moydite-(Y) Crystallography

Axial Ratios:

a:b:c =0.7429:1:0.729

Cell Dimensions:

a = 9.08, b = 12.222, c = 8.911, Z = 8; V = 988.91 Den(Calc)= 3.06

Crystal System:

Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P bca

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 6.11(1), 4.5(0.9), 3.179(0.7),

Physical Properties of Moydite-(Y)

Cleavage:

{010} Good, {101} Indistinct

Color:

Yellow.

Density:

3.13

Diaphaneity:

Transparent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Hardness:

1-2 - Between Talc and Gypsum

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Moydite-(Y)

Gladstone-Dale:

CI meas= 0.014 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.008 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2134,KPDmeas= 0.2086,KC= 0.2117
Ncalc = 1.65 - 1.66

Optical Data:

Biaxial (-), a=1.588, b=1.681, g=1.69, bire=0.1020, 2V(Calc)=32, 2V(Meas)=32.

Calculated Properties of Moydite-(Y)

Electron Density:

Bulk Density (Electron Density)=2.96 gm/cc
note: Specific Gravity of Moydite-(Y) =3.06 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Moydite-(Y)= 47.60 barns/electron
U=PE_Moydite-(Y) x rElectron Density= 140.71 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Moydite-(Y) is Not Radioactive

Moydite-(Y) Classification

Dana Class:

27.01.09.01 (27)Compound Borates

(27.01)Dana Type

(27.01.09)Dana Group

27.01.09.01 Moydite-(Y) YB(OH)4(CO3) P bca 2/m 2/m 2/m

Strunz Class:

06.AC.45 06 - BORATES

06.A - Monoborates

06.AC -B(O,OH)4, without and with additional anions; 1(T), 1(T)+OH, etc.

06.AC.45 Moydite-(Y) YB(OH)4(CO3) P bca 2/m 2/m 2/m

Other Moydite-(Y) Information

References:

NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Moydite-(Y) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - WWW-MINCRYST

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Print or Cut-and-Paste your Moydite-(Y) Specimen Label here :

Moydite-(Y)

YB(OH)4(CO3)
Dana No: 27.01.09.01 Strunz No: 06.AC.45
Locality:

Notes:

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