Zirconolite-3O

Zirconolite-3O
IMA-A (GP);
PLM 1989-RED
Thorium (Minor) 8.2.5.2
(Dana Classification Number)
(No Images) 4/C.15-20
(Strunz ID)

Property Data Remarks
Named for: Its being the Zirconate of its component metals
Alternate
Name(s):
Polymignite

Mineral Class: Oxides & Hydroxides
- Pyrochlore group, Zirkelite - Zirconolite series
Chemical
Formula: (Ca,Fe,Y,Th)₂Fe(Ti,Nb)₃Zr₂O₇
Chemical
Composition:

Calcium: (Ca) 9.33%
Iron: (Fe) 5.78%
Niobium: (Nb) 12.01%
Oxygen: (O) 28.96%
Thorium: (Th) 3.60%
Titanium: (Ti) 13.62%
Zirconium: (Zr) 25.95%
REE2O3:
Lanthanum:
Cerium:
Praeseodymium:
Neodymium:
Samarium
(La)
(Ce)
(Pr)
(Nd)
(Sm) |
|
|
|
|
| 0.74%

by weight
Molecular
Weight: 386.67 daltons (amu)
Specific
Radioactivity:
(All radiation is for a 1 gram, fully aged specimen)

Specific Activity Dose Rate
Becquerels Curies milliRems/hour microSieverts/hour
1.618 × 10⁰³ 4.37 × 10^-08 0.02 2.36

Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)

Crystalography:

System: Orthorhombic - Dipyramidal
Axial Ratios: a:b:c = 0.7173:1:0.5144
Cell Dimensions: a = 10.148, b = 14.147, c = 7.278, Z = 8; V = 1,044.86 Den(Calc) = 4.92
H-M Symbol: 2/m 2/m 2/m
Space Group: Cmca
X Ray Diffraction: By Intensity(I/Io): 2.97(1) 1.82(0.5) 1.55(0.4) 2.57(0.3) 1.18(0.2) 1.05(0.1) 1.15(0.1) 1.49(0.1)

Habit:
Prismatic

Cleavage:

[???] Indistinct

Fracture:
Moh's
Hardness: 5.5
Density: 4.7 grams/cm³
Color:
Streak: Dark brown
Luster: Resinous
Diaphaneity: Opaque
Pleochroism:

(x):
(y:)
(z:)

Ultra Violet
Fluorescence:

Long Wave:
Short Wave:

Magnetism: Non-magnetic
Occurance:
In sanidinite

Associated
Minerals: Nothing listed for this mineral in particular. See data on other thorium-zironium minerals.
Locations:
Very rare

No sites listed for this mineral in particular. See data on other Thorium-Zironium minerals.

Notes:
Somewhat radioactive a- and b-particles, g-rays.

Zirconolite-3O	IMA-A (GP); PLM 1989-RED
Thorium (Minor)	8.2.5.2 (Dana Classification Number)
(No Images)	4/C.15-20 (Strunz ID)