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Yes- in the picture above. It is a rare earth mineral, used in magnets and as a color for red or yellow glass.
no its a rare glass
"REAl" glass, the one used in modern space ships, is made of Rare Earth oxides, Aluminum oxide and small amounts of silicon dioxide.
Csaba Ferenc Rappensberger has written:
'Novel rare-earth aluminosilicate glasses and glass-ceramics'
They were rare metals that are found in the earth.