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Gadolinite
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==Characteristics== Gadolinite is fairly rare and typically occurs as well-formed crystals. It is nearly black in color and has a vitreous [[Lustre (mineralogy)|luster]]. The [[Mohs scale of mineral hardness|hardness]] is between 6.5 and 7 on the [[Mohs scale of mineral hardness|Mohs scale]], and the [[specific gravity]] is between 4.0 and 4.7. It fractures in a [[conchoidal]] pattern and [[streak (mineralogy)|streaks]] grayish-green. It was also thought to exhibit [[pyrognomic]] properties, as it can emit visible light when heated to relatively low [[temperature]]s, but the scientific consensus is that this is the product of [[thermoluminescence]].<ref>{{cite journal |last1=Frondel |first1=Clifford |title=Systematic mineralogy of uranium and thorium |journal=U.S. Geological Survey Bulletin |date=1958 |volume=1064 |doi=10.3133/b1064|doi-access=free |bibcode=1958usgs.rept....6F }}</ref><ref>Schwartz K., Lang M. (2016) Mineral Defects. In: White W. (eds) Encyclopedia of Geochemistry. Encyclopedia of Earth Sciences Series. Springer, Cham</ref>
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