gadolinite – מילון אנגלי-עברי
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Gadolinite
Gadolinite, sometimes also known as
Ytterbite, is a
silicate mineral that consists principally of the silicates of
cerium,
lanthanum,
neodymium,
yttrium,
beryllium, and
iron with the formula (Ce,La,Nd,Y)
2FeBe
2Si
2O
10. It is called gadolinite-(Ce) or gadolinite-(Y) depending on the prominence of the variable element composition (namely, Y if it has more yttrium, and Ce if it has more cerium). It may contain 35.48% yttria sub-group rare earths, 2.17 eria earths, up to 11.6 eO and traces of
thorium. It is found in Sweden, Norway, and the USA (Texas and Colorado).
gadolinite
Noun
1. a mineral that is a source of rare earths; consists of silicates of iron and beryllium and cerium and yttrium and erbium
(synonym) ytterbite
(hypernym) mineral
(substance-meronym) beryllium, Be, glucinium, atomic number 4
Gadolinite
(n.)
A mineral of a nearly black color and vitreous luster, and consisting principally of the silicates of yttrium, cerium, and iron.
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter.
About
Gadolinite-(Ce)
General Information: Chemical Formula:(Ce,La,Nd,Y)2Fe++Be2Si2O10
IMA Status:Approved IMA 1987
Physical Properties: Cleavage:None
Color:black.
Density:4.2
Diaphaniety:Transparent
Hardness:6.5-7 - Pyrite-Quartz
Luster:Vitreous (Glassy)
Streak:greenish gray
More details...
Gadolinite-(Y)
General Information: Chemical Formula:Y2Fe++Be2Si2O10
Composition:(Molecular Weight = 467.85 gm)
Yttrium 38.01 %
Y Beryllium 3.85 %
BeIron 11.94 %
FeSilicon 12.01 %
SiOxygen 34.20 %
O Empirical Formula: Y2Fe2+Be2(Si2O10)
Environment:Pegmatite veins rich in alkaline-earth elements.
IMA Status:Approved IMA 1987
Locality:Kopparberg, Sweden.
Physical Properties: Cleavage:None
Color:brown, green, green black, light green, or black.
Density:4 - 4.5, Average = 4.25
Diaphaniety:Subtransparent to opaque
Habits:Massive - Uniformly indistinguishable crystals forming large masses., Crystalline - Poor - Occurs primarily as crudely formed crystals., Prismatic - Crystals Shaped like Slender Prism s (e.g. tourmaline).
Hardness:6.5-7 - Pyrite-Quartz
Luminescence:Non-fluorescent.
Luster:Vitreous - Greasy
Streak:greenish gray
More details...
GADOLINITE
GADOLINITE