a = 5.1505 Å, b = 5.2116 Å, c = 5.3173 Å, β = 99.23°; Z = 4
Identification
Color
Colorless to yellow, blue, green, greenish or reddish brown, brown, iron-black
Crystal habit
Tabular prismatic, radially fibrous in botryoidal masses
Twinning
Ubiquitous polysynthetic on {100} and {110}
Cleavage
{001} distinct
Fracture
Irregular uneven to subconchoidal
Tenacity
Brittle
Mohs scale hardness
6.5
Luster
Greasy to vitreous
Streak
White
Diaphaneity
Transparent to translucent
Specific gravity
5.5–6
Optical properties
Biaxial (–)
Refractive index
nα = 2.130 nβ = 2.190 nγ = 2.200
Birefringence
δ = 0.070
Pleochroism
X = yellow, reddish brown, oil-green; Y = oil-green, reddish brown; Z = brown, light brown
2V angle
Measured: 30° to 31°
Dispersion
r > v, rather strong
Other characteristics
Blue-green cathodoluminescence
References
[2][3][4]
Baddeleyite is a rare zirconium oxide mineral (ZrO2 or zirconia), occurring in a variety of monoclinic prismatic crystal forms. It is transparent to translucent, has high indices of refraction, and ranges from colorless to yellow, green, and dark brown. See etymology below.
Baddeleyite is a refractory mineral, with a melting point of 2700 °C. Hafnium is a substituting impurity and may be present in quantities ranging from 0.1 to several percent.
It can be found in igneous rocks containing potassium feldspar and plagioclase. Baddeleyite is commonly not found with zircon (ZrSiO4), because it forms in silica-undersaturated rocks, such as mafic rocks. This is because, when silica is free in the system (silica-saturated/oversaturated), zircon is the dominating phase, not baddeleyite. It belongs to the monoclinic-prismatic class, of the P21/c crystal system. It has been used for geochronology.[5]
^Anthony, John W.; Bideaux, Richard A.; Bladh, Kenneth W.; Nichols, Monte C., eds. (1990). "Baddeleyite". Handbook of Mineralogy(PDF). Vol. III (Halides, Hydroxides, Oxides). Chantilly, VA, US: Mineralogical Society of America. ISBN 0962209724. Retrieved December 5, 2011.
^Baddeleyite. Webmineral
^Baddeleyite. Mindat
^Bayanova, T.B. (2006). "Baddeleyite: A promising geochronometer for alkaline and basic magmatism". Petrology. 14 (2): 187–200. Bibcode:2006Petro..14..187B. doi:10.1134/S0869591106020032. S2CID 129079168.
Baddeleyite is a rare zirconium oxide mineral (ZrO2 or zirconia), occurring in a variety of monoclinic prismatic crystal forms. It is transparent to translucent...
occurring form, with a monoclinic crystalline structure, is the mineral baddeleyite. A dopant[clarification needed] stabilized cubic structured zirconia...
Additionally two high-pressure forms are known minerals: a monoclinic baddeleyite-like form known as akaogiite, and the other has a slight monoclinic distortion...
volcano feeder zone: constraints from U–Pb on coexisting zircon and baddeleyite, and 40Ar/39Ar age determinations (Fuerteventura, Canary Islands)". Can...
be used on other materials, such as baddeleyite and monazite (see: monazite geochronology). Zircon and baddeleyite incorporate uranium atoms into their...
absorption spectrum. Discovered in 1892, the yellowish monoclinic mineral baddeleyite is a natural form of zirconium oxide. The high melting point of zirconia...
apatite, vermiculate along with lesser magnetite, linnaeite (cobalt), baddeleyite (zirconium–hafnium), and by-product gold, silver, nickel and platinum...
with abundant vesicles, and contain mineral inclusions, such as zircon, baddeleyite, chromite, rutile, corundum, cristobalite, and coesite. Microtektites...
Chen, M., 2010: Akaogiite: An ultra-dense polymorph of TiO2 with the baddeleyite-type structure, in shocked garnet gneiss from the Ries Crater, Germany...
(1989). "Birthdate for the lapetus Ocean? A precise U-Pb zircon and baddeleyite age for the Long Range dikes, southeast Labrador". Geology. 17 (7). Geological...
more than 140 other minerals, including the commercially useful ores baddeleyite and eudialyte. Zirconium is relatively abundant in S-type stars, and...
on 2007-09-26. Retrieved 2011-08-20. Wingate, M.T.D. (2001). "SHRIMP baddeleyite and zircon ages for an Umkondo dolerite sill, Nyanga Mountains, eastern...
Unusual olive-green zircon Cluster of three compound crystals of zircon Baddeleyite, ZrO2 Cathodoluminescence microscope Cool Early Earth Earliest known...
from many locations in Quebec and Ontario. South Africa – Occurs with baddeleyite as an accessory in carbonatite at Phalaborwa, Eastern Transvaal. Democratic...
Mazzucchelli, Maurizio; Bettencourt, Jorge S. (2013). "U–Pb (ID-TIMS) baddeleyite ages and paleomagnetism of 1.79 and 1.59 Ga tholeiitic dyke swarms, and...
dikes and sills. It occurs as interstitial grains with zirconolite, baddeleyite, and apatite associated with late stage intergrowths of quartz and feldspar...
de León A, Schmitt AK, Weber B (2022). "Multi-episodic formation of baddeleyite and zircon in polymetamorphic anorthosite and rutile-bearing ilmenitite...
from Ceylon was described as a new mineral and he published papers on baddeleyite and zirkelite from Ceylon and carnotite from South Australia. After this...
structure (again, with short Nb-Nb distances); and a higher pressure with baddeleyite-related structure. NbO2 is insoluble in water and is a powerful reducing...
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